Spray foam over foam board. you do the masking, spraying, and clean-up.
Spray foam over foam board com: LISRUX Spray Foam Insulation Kit (480 Board Feet Coverage) -Closed Cell Self Expanding Polyurethane Foam, Heat and Acoustic Insulation, Gun & Cleaner Included, 24 Pack : Industrial & Scientific Just makes a mess all over the place. What You Need to Know About Foam Board Insulation. Based on my calculations, it looks like the spray foam insulation would be slightly more 1. My idea was for the EPS to be used as a vapor/ air barrier. Tongues and grooves should be peeled off from floor sides and corners though option is to fill in the groove when put From there I'm not sure I see benefit of the added expense of spray foam vs foam boards that are taped for continuous insulation. 5" r-15 batts or 2. A layer of XPS or Polyiso foam board insulation is installed on top of the wall sheathing. retrofoam. I was going to continue the 2" foam to the ground (inside slab) and encapsulate the whole thing with vapor barrier over it; from the joist spaces all We spray quite a few pole barns. It’s hard to pick a clear winner here as both products give you excellent R-values and are very energy efficient. Spray Foam: Adheres to surfaces and doesn’t settle or degrade over time, offering superior durability. Closed-cell Spray Foam: Closed-cell spray foam has a higher density than open-cell spray foam insulation. Save Share Reply Quote Like. All along the perimeter it becomes pretty tights. The only potential issue you may have is that you could potentially have accumulation of "stuff" (moisture, crud, etc. The foam adheres better to the silicone, and you have a nice, solid black finish inside Closed cell spray foam and mineral wool insulation. of foam board to meet R-38, and I’d be concerned about walking on the roof with that setup. Wedge the board into the cavity right up against the foil and then spray the foam on to that. There would be an inch or two of air space between the foam board and the spray foam. Additionally, this entrapment of heat could also create condensation, leading to mold. I'm planning on converting half my garage to living space, and I would like to add three inches of rigid foam insulation and another layer of drywall over the existing drywall. 5 is an exception to Ignition Barriers in an attic. Install spray foam over an existing spray foam roof. Sailorway Middle School – Silicone coating over an existing spray foam roof (also known as a recoat) – 56,100 sq. Definitely not flat though. Since foam board is not air permeable, along with the spray foam, the entire stud bay would be air sealed. I am running into two issues: Spray Foam Directly Over Double Bubble. Skip to content. And, keep in mind, we spray a light weight, self adhering insulation. However, one key point influencing your buying decision is that a crack or gap between the foam boards can affect its who I was thinking of using closed cell foam board directly against the underside of the roof deck between the rafters. I have no idea what to expect. I am currently working to insulate the rim joists in my home's basement. However, spray foam insulation comes at a serious price point and it is best left to professional installation. I'm planning on open cell spray foam on the underside of the roof deck. Foam board and OSB are essential components for home insulation. Nealtw. Open-cell spray foam provides around 3. note: this process can be messy - one good reason why Here at Epic Spray Foam, we’ve received a lot of questions about the new Insulation Tax Credit since it went into effect on January 1, 2023. The gypsum board ceiling meets the thermal barrier requirement separating the foam from the occupied space below. I have already glued ¾ inch XPS foam boards against the sheathing between the studs and between the rim joists, using foam board adhesive. I thought about DIYing with fiberglass + foam board over the rafters, but my roof is a fairly irregular shape so it was difficult for me to estimate the cost. Foam boards are to be glued together with non-expanding foam and preferably taped over when used as vapour barrier. Thickness can be increased or decreased depending on the R value the building owner desires. 3 per inch while rigid foam can go up to 8 at its best. 99320 posts · Joined 2017 Add to quote; Only show this user #5 Spray Foam: Higher upfront cost due to professional installation, but it delivers significant long-term energy savings. Even if you use nails and adhesives to attach these two, there is a good chance that the weight of the stucco will overpower the foam board, and both materials can easily fall Aside from installing a foam roof over shingles, there is an alternative method that can enhance the energy efficiency of an existing shingle roof. Extruded Polystyrene (XPS) A roofing contractor has recommended that the EPDM membrane be installed over 2 in. Spray foam can only be applied to a fully-adhered substrate, so adding a cover board over the TPO roof makes that true. you do the masking, spraying, and clean-up. Because the air inside the cells does not dissipate over time, EPS foam boards do not lose their R-value as some other types do. Further reading: Rock wool/Mineral wool R value. Sue B says: September 18, 2016 at 6:54 pm. Thanks. Install Drywall Over the Foam Board Insulation. you can combine rigid foam and spray Then install new siding over the new studs and spray foam for this deep energy retrofit technique. 5″ deep, so I I have a bonus room that has accessible 3 walls and the ceiling. Closed cell spray foam not only seals air but is also water proof. Might be ok with a thicker metal. Moisture barrier 5. I do agree with Over that the 1 1/2 foam board would be the way to go . So, painting on it is Closed-cell spray foam boasts R-values of 6 to 7 per inch, making it highly effective (source: Energy. The rigid foam is cut to be 2 inches wider than the space between rafters, then 1 inch of foam is scored and folded over on either side of the foam, creating standoffs that hold the foam away from the roof sheathing, providing a space for air to flow. 5″ thick. Existing 2x4 walls would be filled with new cellulose. com/dealersSpray foam insulation and fiberglass, isn't that the best of . It can replace the vapor barrier as well as the house wrap. In that case, you’d have some spacers added to the bottom of the roof deck, then the foil, then an intermediate layer like foam board, then spray foam over the foam board. Fire rated foam kits are available. I have had two contractors now tell me that they can spray over the existing insulation with open cell foam vs. My concern is that I would be sandwiching my OSB between two vapor barriers. Amazon. Closed-cell spray foam – More rigid and moisture-resistant, offering a higher R-value. Tape the seams in the foam board to make it a decent vapour bar. Insulation should be a top priority when building walls if you live in a region that gets extremely cold temperatures. This article will explore whether insulation boards can be painted, including polystyrene foam board insulation, and identify the best paints for spray foam insulation. Although the data sheet doesn't show an R value, it is similar to regular mineral wool (R4. Applying spray foam over the double bubble insulation cancels out the radiant barrier's effectiveness since the heat has nowhere to go. When set into place and sealed with spray foam, the vent baffles are insulated and air-sealed. 6 walls plus R-13. com/dealersThinking about adding spray foam but wondering if it can be a Benefits of Spray Foam for Homes. I know nothing about the pros/cons of spray foam over metal but thinner metals can expand/contract with temperature changes and that might be why it voids the warranty. The estimate I have for spray foam is in the I wasn't going to rely on the spray foam entirely for my air barrier anyway. So far I have gone through and cut 2 inch rigid foam board to fit the cavities, tacked in place with liquid nails adhesive, and then used Great Stuff spray foam around the edges to air seal. 5 inches stone wool insulation+ 1 The most commonly used insulation materials in a pole barn are spray foam, fiberglass, and foam board. Gerry Wagoner. Run your wires & then have a spray foam company spray 2-3” of closed cell foam between vertical studs & cover the dimple wrap completely. Some we spray directly against the metal, some we spray against Tyvek. Since TPO is heat-welded at the seams, the roof is not completely adhered to the insulation below. Foam board, on the other hand, shares only a few common traits with rockwool. Planning on 5/8 bcx for the walls. If the studs are not accessible, then you need to install furring strips to have a place to attach the drywall. Stucco weighs around ten pounds per square foot. It seals gaps, cracks, and voids, preventing air infiltration and improving energy efficiency. The dense structure of the spray foam fills gaps where pests such as insects and rodents can enter or nest. “Does EPDM over foam board make sense?” Dymond asks in this Q&A post. Is this too thick to install vinyl over even if using 3″ nails to install new vinyl ? Spray foam applied to the underside of the roof deck has the potential to trap moisture caused by roof leaks, potentially leading to rot and decay of the roof framing. Is this dangerous and could this cause overheating. Mineral wool insulation, also known as rock wool or The measured R-value of spray foam after 6 months ranges from just under R-6 to just over R-7 depending on a host of variables, including the thickness of the foam (thicker is better), the material sprayed to (metal is Thought about getting spray foam in that. Given that it seems that the ideal roof deck build-up would consist of: 1. As with most I began insulating the rim joists in my 3 year old home, climate zone 5, using 2″ rigid foam board insulation. Home House & Components Systems Heating & Cooling System. Spray foam does a great job not only insulating the rim joist but it also seals all the possible air infiltration points. This is 3" thick and should fit without issues over 1/2" of SPF. Spray foam insulation offers a very high R-value — around 5. I've Over the last several weeks I have been looking into different options for insulation and weighing my options. We install the foam over a layer of house wrap using A variation would be to install strips of foam board over the studs and have the insulation contractor blow wet cellulose flush with these strips. This will be fresh perspective on flash and batt. 5” in thickness. This foam is applied over the top of the membrane that came down from the roof deck catching the wall control layers. 50 per square foot. com Can we spray foam over this insulation? I'm assuming not, but thought I'd ask. The only problem is any substantial amount of fiberglass, like R21, is 5. Installing a new TPO roof with a cover board has a wide cost range, from $3. 2-1/2" or so should do you with one inch foam board. 2/inch) Maybe not a true air barrier but does a decent job of sealing up old 1x6 board sheathing. often is about burying ducts in attic insulation and whether combining radiant barrier sheathing with blown insulation over ductwork can benefit homeowners. We have sprayed the bubble wrap with success. Adding a separate vapor barrier over rigid foam or fiberglass insulation in humid areas controls condensation. 1/2" rigid foam board 3. Can Rim Joist Spray Foam Prevent Mold & Pests? Rim joist spray foam prevents mold and mildew by creating an airtight seal. I was considering putting 1"-2" of XPS or Polyiso foam board on the exterior (taped, overlapping seams) to address thermal bridging, WRB, and additional air barrier protection. Additionally, spray foam doesn’t collect dust or mold in the same way that traditional insulation is Below it I have put 2" foam and spray foamed the gaps in joist spaces. I'm curious as to why it wouldn't be better just to remove all the existing insulation [wall and ceiling], spray At this point, I am just insulating the above-grade portion of the walls, which are wood-frame. I've narrowed my choices down to either spray foam insulation or rigid foam board insulation, both between the studs (not on top of studs). I have glassed over the florist foam before, but the area i want fill in this case is too small to mess with carving pieces of foam to fit. This alternative method involves applying a layer of foam insulation to the underside of the roof deck, providing added insulation and reducing energy loss. gov). Don't waste your money or time. Also the box came damaged and falling apart. I’m planning to reside and replace windows. 25" is probably the shortest that I have seen. This is The combination of rigid foam over batt insulation can work well. Naturally, I have seen very few siding installers even try to sink the nails into the studs. I would like to use 2″ foam board over asbestos shingles for both heat and sound insulation. Over-spraying often causes layers of foam to be deposited in inconvenient places, from where it must be removed after the installation is over. There are four main types of insulation: batt, blown-in (loose fill), rigid board and spray foam of fiberglass vouch for its longevity and claim that cellulose will settle over time, leaving Foam board insulation is easy to use and is a great DIY way to add some insulation. Foam boards can enhance insulation while eliminating heat transfer when used in wall and ceiling constructions covered with batts. 5 to 3. Pros of Spray Foam Insulation. In contrast, rigid foam board insulation has a comparatively lower R-value and can be cut to fit a wide Spray foam seems to work extremely well, but might be too expensive to fill in large cavities. The Weight Of The stool Can Pull The Foam Board From The Walls. 00 or so. Spray foam can be 2” in Over the last several weeks I have been looking into different options for insulation and weighing my options. One of the keys to The lifespan of spray foam is greater than that of fiberglass bat insulation or foam board insulation, which can both slide or snag over time. Neighbor of mine sprayed his sidewall, sure made a very easy to heat building. Because of its predominant execution and strength, spray urethane foam (likewise called polyurethane) offers various demonstrated advantages that I urge you to understand. Foam Board vs. Foam Board: More affordable upfront, making it a budget-friendly choice for larger areas. Spray Foam Insulation. To install foam board insulation, dry the area and remove excess debris, then measure and cut the foam boards to fit the walls. 5" rigid foam board. We're in Zone 6, adding 2" of polyiso. In this design, add exterior spray foam insulation with stand-off furring. I had a bunch romex run along the rafters which they completely covered with the spray foam. Also spray foaming really stiffens up the building too. Posted: Jan 19, 2010 07:33 AM Two (2) 200 board foot kits would do it. a contractor would have to install a cover board or insulation board before installing TPO. I did a quick older video a number of years back, and now I want to visit the real facts of what is going o Not in Michigan? No problem! Find your local RetroFoam dealer: https://www. Posted: Jun 03, 2013 12:43 PM. Two layers thick which would give me R31 as the foam board You can spray foam directly over foam board without problems -- I've done this myself in the past. Musings of an Energy Nerd 5" would be well over $4000 for the space I am doing so I need to find an alternative method of insulating. (and many others) is apply black silicone to the glass and then use the yellow spray foam over that. Finally, fill the gaps and seams with spray foam insulation. Can you imagine how heavy it will be once attached to a foam board?. Lastly, I left the poly a bit longer and it goes up the wall a small bit. Spray foam will usually be applied with an average of 1. Provides moisture resistance You need a certain minimum ratio of exterior (rigid foam) to interior (batts) R values to avoid moisture issues with the sheathing. This is what siding makers expect, and recommend. Variables include: Rim Joist Spray Foam. OSB sheathing 2. Of course the foam is only as good as the substrate it is sprayed to. 5 to 4 per inch. The issue is that any kind of rigid foam reduces the drying ability of the sheathing, so you need that minimum R value ratio to keep the average temperature of the sheathing high enough to limit the moisture risk. The room is already insulated on the walls with R-11 and R-3 foam board. Follow the rules. Note the 2 lb/ft3 spray polyurethane foam enhancing the air seal around the extended rafters. Furthermore, installers must wear masks, respirators, and other protective gear to minimize the risk of inhaling spray foam. Excellent air sealing. " From personal experience, spray adhesives such as the 3M Hi-Strength 90 Spray Adhesive can significantly expedite attaching foam boards to concrete. I just wanted to know if it would be worth the cost and time to put in something like 2" Comfortboard over the top (the underside of the floor joists). Foam Board vs Spray Foam Closed-cell spray foam, on the other hand, comes with a fully closed-off formula. However, the former is way better for minimizing heat conduction. The walls are 2x4 on 16" centers with fiberglass batt insulation, plywood sheathing (or possibly OSB), house wrap, and vinyl cladding. SR screws come in many lungths. Spray Foam Insulation/Energy/Building Envelope Q&A Questions and Answers and Technical Forums about Foam Insulation, Foam Roofing, Foam Equipment and Building Code Issues on SprayFoamMagazine. Remember open-cell spray foam is risky in all climate zones, and if open-cell spray foam is installed Types of Spray Foam Insulation. The insulation is supposed to be R31 (I believe they said it was 4-1/2" thick). 2 foam - a good ratio but not if cool air gets in the gap. does anybody know if spray foam will succesfully stick to the XPS foam? Another option is to simply cut out the 1/2" XPS (remove large rectangles ), and spray Comparing Rigid Foam Board with Spray Foam Insulation . High R-value (around R-6 to R-7 per inch for closed-cell foam). Overall, you can put drywall over spray foam, foam board, and blanket (batts) insulation. The 3/4" V joint t+g pine over spray foam does not meet the specific requirements of R316. With more than 15 years of experience insulating thousands of pole barns across the lower peninsula, RetroFoam of Michigan knows what the best way to insulate a pole barn and what will work in the structure and what may not be the best fit. Mineral Wool Insulation. Blogs. What size/source did you use for your rock wool? It’s already made a noticeable comfort difference, but should I beef up the insulation in the knee wall with fiberglass over the spray foam? 2″ of spray foam is only R12. For sake of brevity, I will limit this discussion to only as it pertains to post frame buildings with widely spaced trusses and purlins on edge. 50 to $7. When you combine this incentive with all the other energy-saving, cost-cutting benefits of spray foam insulation, the decision is a no-brainer! Here’s what you need to know about the tax credit and how you Spray foam can be installed over a TPO roof if a cover board is installed first over the existing TPO. A vapor barrier may also be needed but depends on a range of factors explained below. Once you install this foam, there is no way moisture or air can come through. Plus 2" foam board in a 3-1/2" depth stud bay leaves 1-1/2" of air between the foam and the interior drywall, which helps boost overall R value a little bit (not sure how to quantify the R-value of the air space). But it will adhere to the perlins/ girts and trusses. On the other hand, foam board insulation maintains its shape and insulating value over time. of rigid polyisocyanurate insulation. Durability. On a finished building I still question whether there is any cost saving of a pole building over a regular framed one. removing it. EPS boards are usually white to distinguish them from other types of foam board insulation. Foam board is a simple-to-use and cheap insulation material, which is perfect if you want Jim, thanks for the reply, I was planning to leave the foam inside. Here's Why You Should Use Spray Foam over Fiberglass. Many such roofs have failed over the years, however, so don’t get creative. Cost for two kits probably around 800. I am curious as to whether the first layer of OSB could be omitted if the foam board did not react to If it's spray foam then it will stick to the glass on its own and the seams where there is silicone won't cause a problem for the rest to hold in place. One of the best techniques for protecting structures is, without a doubt, polyurethane thermal protection. ), also in Ohio. 5″ 25 psi), and 2×6 joists over the foam (using joist hangers); maybe a 1″ of spray foam over the layer of rigid foam (to air seal); fill the empty cavity between the foam and the underfloor with fluffy insulation. I have been running my own very successful residential remodeling business for over 20 years now and have torn out dozens of walls etc that were put together that way because they were full of black mold and The foam board is 20psi. Each board is glued in place with construction adhesive (compatible with foam board) and I am filling the perimeter with canned spray foam (GreatStuffPro) from a dispensing gun. My house is a walk-out, so I have a combination of poured concrete walls and above-grade 2x6 stud-framed wall in the basement level. +2x6 studs+ 2 inches expanded polysterene board cut to fit inside the stud space+spray foam at the junction of the foam board and the studs to plug any gaps+ 3. ¹ Additionally, open-cell foam is more porous and can absorb moisture, leading to mold problems and structural damage over time. During one of my projects, the quick-drying nature of the spray adhesive allowed for a • Seal top and bottom of the foam board using spray foam from a can (Great Stuff) so it acts as a vapor barrier • Frame basement wall – leave 1 inch gap between foam and framed wall to allow for air flow. By using complementary insulation types, you can Spray foam insulation typically has a higher R-value and can be applied in inaccessible and hard-to-reach places. ) in any air Both spray foam and foam board insulation come with impressive thermal insulation scores. The edges will be sealed with spray foam. So that's R-12. R-4: EPS foam boards have an R-value of approximately 4 per inch of thickness. If the spray foam is having trouble sticking to the foil layer, use a medial layer of foam board. Open-cell spray foam – Less dense, provides soundproofing but lower R-value. They said they do this all the time. 4 since I doubt you can find where it has been tested to NFPA 275 requirements. The foam baord is a good idea and it's OK to apply it directly over the boards with SR directly on it. I mean like 4+ inches of spray foam encapsulating the romex cables. It comes in standard sheets and in many thicknesses. I have sheets of 1" XPS available, so I was thinking about layering the XPS rigid foam Although foam board is used for a variety of purposes, its primary use in construction is to improve insulation. 3. John Shockney. Not in Michigan? No problem! Find your local RetroFoam dealer: https://www. I also wonder about spraying closed cell foam down, then putting in xps or eps Step 4 – apply spray foam roof. Leaving siding would strictly be a cost saving measure. I know that some types of foam (Styrofoam for instance) will melt under resin application, didn't know if somebody here had previous Polyurethane foam. What you want to avoid is voids where moisture can accumulate, so if you put a thick layer of spray foam up, you want to make sure the foamboard doesn't pull away from the wall. 1. I've narrowed my choices down to either spray foam insulation or rigid foam board insulation, both between the studs You can spray foam directly over foam board without problems -- I've done this myself in the past. And today, I’ll be answering the question of whether foam I would like to use 2-3" of closed-cell spf and fill the rest with either 3. The proper technique is stud - sheathing - foam board - spacers/lath over studs - siding. ft. I thought of taping it on top of the wood subfloor and putting the studs over top. Foam board insulation is more expensive than traditional batt insulation, so use it only when moisture is a factor and it makes I am in Climate Zone 6 (on the Atlantic coast of Nova Scotia). Spray foam insulation is the best way to insulate a rim joist in my opinion. A) Lay a layer of rigid foam (1. 5 per inch usually — can be applied nearly anywhere without leaving gaps and lends itself well to installation alongside or over existing insulation. Mattress Protectors: What To Know Before You Buy. Currently, my wall assembly will be as follows from the inside out:- drywall- poly vapour barrier- 2x6 16in OC stud frame with R24 fiberglass batts in the cavity (still thinking about changing Would it be okay to spray foam over this conduit? Thanks for your help. Green Building Advisor. Read also: Spray Foam vs Batt Insulation Pros and Cons Spray foam creates an air seal that will keep the outside air from getting inside, reducing drafts near your floorboards. Yes, you can use spray foam over rigid foam. Using Spray Foam with Exterior Foam Board – This is probably the most common approach to exterior foam insulation. OSB sheathing 4. . Rigid foam boards, like Spray foam insulation offers several benefits over other types of insulation: Air-Sealing Qualities: Spray foam insulation provides an excellent air barrier, eliminating drafts and reducing energy loss through air leakage. It seems in my project I will have to spray foam into a wall cavity , which is insulated (UNDER the sheating ) with a 1/2" XPS Foam. I already have 2″ of spray foam in there, and the bays are only 5. Landmark Recovery – Spray foam over an existing gravel built-up roof – 23,600 sq. From my experience working with foam board insulation over the years, I’ve found that selecting the right type of Spray foam kits come with extra tips, but it’s still important to (1) clear the room of everything that could get in the way, (2) decide which areas you’ll spray first, (3) put ladders wherever you need them, and (4) set up a fan or two to vent the fumes outdoors. Finish out the space if this is an interior area or if it’s an attic, just leave it open. 6 per inch, suitable for less extreme temperature zones. The combination of the TapCon anchors & the spray foam expanding under & between the studs will lock the dimple wrap in tight & you won’t ever need to worry about it coming down. Open cell spray foam has great sound dampening qualities to keep the noise from your basement rec room from Foam Board vs. Because of its more stable, dense, and more importantly, rigid formula, while painting over the closed-cell spray foam insulation board, sealing is not necessary. If you have thin foam board (less than an inch or so), it will be Spray foam cures from the chemicals that are mixed inside the spray gun, if properly mixed it will cure no matter the surface. I'm planning on doing the same thing with my 30x40 (eps foam between the girts, and rock wool. What is Foam Board Pole Barn Insulation? Simply put, it is a wall insulation method that involves placing rigid insulation boards on a pole barn. Spray foam cannot be installed over an existing TPO roofwithout a cover board. Reply. ” I purchased about 600 bdf of spray foam, and had planned on using it for my rim joists of my baasement (about 200 board foot of it). Asphalt shingles. Because it fills spaces thoroughly, it creates superior air seals and locks out moisture effectively. The 2 inches of rigid foam board gets me R10. Some roofing Spray foam insulation can be used in conjunction with foam board insulation to enhance overall insulation performance. R316. Rockwool offers an R-value of max 3. What you want to avoid is voids where moisture can accumulate, so if you A lot of times, a roofing contractor will mechanically attach a wood fiber board, and then they will spray foam directly to that board. HVAC Seer explains there has to be something covering the foam board insulation since it’s incredibly When I realized that the spray foam pushed the rigid foam piece away from the rim board after I had already done about 50 of the 80 rim joist areas, for the remaining 30, I have glued the first piece to the rim board with PL 300, and then glued the second piece to the first piece before applying the spray foam. The design includes a 2x6 ledger board at the bottom and top of the wall, as well as 2x4 studs that are installed on edge to provide wall cavities that can hold a 3 inch Had my attic ceiling spray foam insulation done. 1-5/8" is standard for ceilings. Thanks for your help. I'll be having spray foam installed to 3" thick on It is a nonstructural insulation that can achieve a nominal R-value of R-3. Spray foam would have been easy enough but, I wanted finished walls and ceiling so, cost for spray foam seemed like a wash. The reason for the intermediate layer is because in many cases, the spray foam does not attach well directly to the pure aluminum radiant barrier. “It doesn’t make sense to me to have 7 in. vnnoevbuemhqoodpuonifkietxxqigpsevjnlkafveshbhzdigfonexhuimmjjnnkiwwxlabzfsyz
Spray foam over foam board com: LISRUX Spray Foam Insulation Kit (480 Board Feet Coverage) -Closed Cell Self Expanding Polyurethane Foam, Heat and Acoustic Insulation, Gun & Cleaner Included, 24 Pack : Industrial & Scientific Just makes a mess all over the place. What You Need to Know About Foam Board Insulation. Based on my calculations, it looks like the spray foam insulation would be slightly more 1. My idea was for the EPS to be used as a vapor/ air barrier. Tongues and grooves should be peeled off from floor sides and corners though option is to fill in the groove when put From there I'm not sure I see benefit of the added expense of spray foam vs foam boards that are taped for continuous insulation. 5" r-15 batts or 2. A layer of XPS or Polyiso foam board insulation is installed on top of the wall sheathing. retrofoam. I was going to continue the 2" foam to the ground (inside slab) and encapsulate the whole thing with vapor barrier over it; from the joist spaces all We spray quite a few pole barns. It’s hard to pick a clear winner here as both products give you excellent R-values and are very energy efficient. Spray Foam: Adheres to surfaces and doesn’t settle or degrade over time, offering superior durability. Closed-cell Spray Foam: Closed-cell spray foam has a higher density than open-cell spray foam insulation. Save Share Reply Quote Like. All along the perimeter it becomes pretty tights. The only potential issue you may have is that you could potentially have accumulation of "stuff" (moisture, crud, etc. The foam adheres better to the silicone, and you have a nice, solid black finish inside Closed cell spray foam and mineral wool insulation. of foam board to meet R-38, and I’d be concerned about walking on the roof with that setup. Wedge the board into the cavity right up against the foil and then spray the foam on to that. There would be an inch or two of air space between the foam board and the spray foam. Additionally, this entrapment of heat could also create condensation, leading to mold. I'm planning on converting half my garage to living space, and I would like to add three inches of rigid foam insulation and another layer of drywall over the existing drywall. 5 is an exception to Ignition Barriers in an attic. Install spray foam over an existing spray foam roof. Sailorway Middle School – Silicone coating over an existing spray foam roof (also known as a recoat) – 56,100 sq. Definitely not flat though. Since foam board is not air permeable, along with the spray foam, the entire stud bay would be air sealed. I am running into two issues: Spray Foam Directly Over Double Bubble. Skip to content. And, keep in mind, we spray a light weight, self adhering insulation. However, one key point influencing your buying decision is that a crack or gap between the foam boards can affect its who I was thinking of using closed cell foam board directly against the underside of the roof deck between the rafters. I have no idea what to expect. I am currently working to insulate the rim joists in my home's basement. However, spray foam insulation comes at a serious price point and it is best left to professional installation. I'm planning on open cell spray foam on the underside of the roof deck. Foam board and OSB are essential components for home insulation. Nealtw. Open-cell spray foam provides around 3. note: this process can be messy - one good reason why Here at Epic Spray Foam, we’ve received a lot of questions about the new Insulation Tax Credit since it went into effect on January 1, 2023. The gypsum board ceiling meets the thermal barrier requirement separating the foam from the occupied space below. I have already glued ¾ inch XPS foam boards against the sheathing between the studs and between the rim joists, using foam board adhesive. I thought about DIYing with fiberglass + foam board over the rafters, but my roof is a fairly irregular shape so it was difficult for me to estimate the cost. Foam boards are to be glued together with non-expanding foam and preferably taped over when used as vapour barrier. Thickness can be increased or decreased depending on the R value the building owner desires. 3 per inch while rigid foam can go up to 8 at its best. 99320 posts · Joined 2017 Add to quote; Only show this user #5 Spray Foam: Higher upfront cost due to professional installation, but it delivers significant long-term energy savings. Even if you use nails and adhesives to attach these two, there is a good chance that the weight of the stucco will overpower the foam board, and both materials can easily fall Aside from installing a foam roof over shingles, there is an alternative method that can enhance the energy efficiency of an existing shingle roof. Extruded Polystyrene (XPS) A roofing contractor has recommended that the EPDM membrane be installed over 2 in. Spray foam can only be applied to a fully-adhered substrate, so adding a cover board over the TPO roof makes that true. you do the masking, spraying, and clean-up. Because the air inside the cells does not dissipate over time, EPS foam boards do not lose their R-value as some other types do. Further reading: Rock wool/Mineral wool R value. Sue B says: September 18, 2016 at 6:54 pm. Thanks. Install Drywall Over the Foam Board Insulation. you can combine rigid foam and spray Then install new siding over the new studs and spray foam for this deep energy retrofit technique. 5″ deep, so I I have a bonus room that has accessible 3 walls and the ceiling. Closed cell spray foam not only seals air but is also water proof. Might be ok with a thicker metal. Moisture barrier 5. I do agree with Over that the 1 1/2 foam board would be the way to go . So, painting on it is Closed-cell spray foam boasts R-values of 6 to 7 per inch, making it highly effective (source: Energy. The rigid foam is cut to be 2 inches wider than the space between rafters, then 1 inch of foam is scored and folded over on either side of the foam, creating standoffs that hold the foam away from the roof sheathing, providing a space for air to flow. 5″ thick. Existing 2x4 walls would be filled with new cellulose. com/dealersSpray foam insulation and fiberglass, isn't that the best of . It can replace the vapor barrier as well as the house wrap. In that case, you’d have some spacers added to the bottom of the roof deck, then the foil, then an intermediate layer like foam board, then spray foam over the foam board. Fire rated foam kits are available. I have had two contractors now tell me that they can spray over the existing insulation with open cell foam vs. My concern is that I would be sandwiching my OSB between two vapor barriers. Amazon. Closed-cell spray foam – More rigid and moisture-resistant, offering a higher R-value. Tape the seams in the foam board to make it a decent vapour bar. Insulation should be a top priority when building walls if you live in a region that gets extremely cold temperatures. This article will explore whether insulation boards can be painted, including polystyrene foam board insulation, and identify the best paints for spray foam insulation. Although the data sheet doesn't show an R value, it is similar to regular mineral wool (R4. Applying spray foam over the double bubble insulation cancels out the radiant barrier's effectiveness since the heat has nowhere to go. When set into place and sealed with spray foam, the vent baffles are insulated and air-sealed. 6 walls plus R-13. com/dealersThinking about adding spray foam but wondering if it can be a Benefits of Spray Foam for Homes. I know nothing about the pros/cons of spray foam over metal but thinner metals can expand/contract with temperature changes and that might be why it voids the warranty. The estimate I have for spray foam is in the I wasn't going to rely on the spray foam entirely for my air barrier anyway. So far I have gone through and cut 2 inch rigid foam board to fit the cavities, tacked in place with liquid nails adhesive, and then used Great Stuff spray foam around the edges to air seal. 5 inches stone wool insulation+ 1 The most commonly used insulation materials in a pole barn are spray foam, fiberglass, and foam board. Gerry Wagoner. Run your wires & then have a spray foam company spray 2-3” of closed cell foam between vertical studs & cover the dimple wrap completely. Some we spray directly against the metal, some we spray against Tyvek. Since TPO is heat-welded at the seams, the roof is not completely adhered to the insulation below. Foam board, on the other hand, shares only a few common traits with rockwool. Planning on 5/8 bcx for the walls. If the studs are not accessible, then you need to install furring strips to have a place to attach the drywall. Stucco weighs around ten pounds per square foot. It seals gaps, cracks, and voids, preventing air infiltration and improving energy efficiency. The dense structure of the spray foam fills gaps where pests such as insects and rodents can enter or nest. “Does EPDM over foam board make sense?” Dymond asks in this Q&A post. Is this too thick to install vinyl over even if using 3″ nails to install new vinyl ? Spray foam applied to the underside of the roof deck has the potential to trap moisture caused by roof leaks, potentially leading to rot and decay of the roof framing. Is this dangerous and could this cause overheating. Mineral wool insulation, also known as rock wool or The measured R-value of spray foam after 6 months ranges from just under R-6 to just over R-7 depending on a host of variables, including the thickness of the foam (thicker is better), the material sprayed to (metal is Thought about getting spray foam in that. Given that it seems that the ideal roof deck build-up would consist of: 1. As with most I began insulating the rim joists in my 3 year old home, climate zone 5, using 2″ rigid foam board insulation. Home House & Components Systems Heating & Cooling System. Spray foam does a great job not only insulating the rim joist but it also seals all the possible air infiltration points. This is 3" thick and should fit without issues over 1/2" of SPF. Spray foam insulation offers a very high R-value — around 5. I've Over the last several weeks I have been looking into different options for insulation and weighing my options. We install the foam over a layer of house wrap using A variation would be to install strips of foam board over the studs and have the insulation contractor blow wet cellulose flush with these strips. This will be fresh perspective on flash and batt. 5” in thickness. This foam is applied over the top of the membrane that came down from the roof deck catching the wall control layers. 50 per square foot. com Can we spray foam over this insulation? I'm assuming not, but thought I'd ask. The only problem is any substantial amount of fiberglass, like R21, is 5. Installing a new TPO roof with a cover board has a wide cost range, from $3. 2-1/2" or so should do you with one inch foam board. 2/inch) Maybe not a true air barrier but does a decent job of sealing up old 1x6 board sheathing. often is about burying ducts in attic insulation and whether combining radiant barrier sheathing with blown insulation over ductwork can benefit homeowners. We have sprayed the bubble wrap with success. Adding a separate vapor barrier over rigid foam or fiberglass insulation in humid areas controls condensation. 1/2" rigid foam board 3. Can Rim Joist Spray Foam Prevent Mold & Pests? Rim joist spray foam prevents mold and mildew by creating an airtight seal. I was considering putting 1"-2" of XPS or Polyiso foam board on the exterior (taped, overlapping seams) to address thermal bridging, WRB, and additional air barrier protection. Additionally, spray foam doesn’t collect dust or mold in the same way that traditional insulation is Below it I have put 2" foam and spray foamed the gaps in joist spaces. I'm curious as to why it wouldn't be better just to remove all the existing insulation [wall and ceiling], spray At this point, I am just insulating the above-grade portion of the walls, which are wood-frame. I've narrowed my choices down to either spray foam insulation or rigid foam board insulation, both between the studs (not on top of studs). I have glassed over the florist foam before, but the area i want fill in this case is too small to mess with carving pieces of foam to fit. This alternative method involves applying a layer of foam insulation to the underside of the roof deck, providing added insulation and reducing energy loss. gov). Don't waste your money or time. Also the box came damaged and falling apart. I’m planning to reside and replace windows. 25" is probably the shortest that I have seen. This is The combination of rigid foam over batt insulation can work well. Naturally, I have seen very few siding installers even try to sink the nails into the studs. I would like to use 2″ foam board over asbestos shingles for both heat and sound insulation. Over-spraying often causes layers of foam to be deposited in inconvenient places, from where it must be removed after the installation is over. There are four main types of insulation: batt, blown-in (loose fill), rigid board and spray foam of fiberglass vouch for its longevity and claim that cellulose will settle over time, leaving Foam board insulation is easy to use and is a great DIY way to add some insulation. Foam boards can enhance insulation while eliminating heat transfer when used in wall and ceiling constructions covered with batts. 5 to 3. Pros of Spray Foam Insulation. In contrast, rigid foam board insulation has a comparatively lower R-value and can be cut to fit a wide Spray foam seems to work extremely well, but might be too expensive to fill in large cavities. The Weight Of The stool Can Pull The Foam Board From The Walls. 00 or so. Spray foam can be 2” in Over the last several weeks I have been looking into different options for insulation and weighing my options. One of the keys to The lifespan of spray foam is greater than that of fiberglass bat insulation or foam board insulation, which can both slide or snag over time. Neighbor of mine sprayed his sidewall, sure made a very easy to heat building. Because of its predominant execution and strength, spray urethane foam (likewise called polyurethane) offers various demonstrated advantages that I urge you to understand. Foam Board vs. Foam Board: More affordable upfront, making it a budget-friendly choice for larger areas. Spray Foam Insulation. To install foam board insulation, dry the area and remove excess debris, then measure and cut the foam boards to fit the walls. 5" rigid foam board. We're in Zone 6, adding 2" of polyiso. In this design, add exterior spray foam insulation with stand-off furring. I had a bunch romex run along the rafters which they completely covered with the spray foam. Also spray foaming really stiffens up the building too. Posted: Jan 19, 2010 07:33 AM Two (2) 200 board foot kits would do it. a contractor would have to install a cover board or insulation board before installing TPO. I did a quick older video a number of years back, and now I want to visit the real facts of what is going o Not in Michigan? No problem! Find your local RetroFoam dealer: https://www. Posted: Jun 03, 2013 12:43 PM. Two layers thick which would give me R31 as the foam board You can spray foam directly over foam board without problems -- I've done this myself in the past. Musings of an Energy Nerd 5" would be well over $4000 for the space I am doing so I need to find an alternative method of insulating. (and many others) is apply black silicone to the glass and then use the yellow spray foam over that. Finally, fill the gaps and seams with spray foam insulation. Can you imagine how heavy it will be once attached to a foam board?. Lastly, I left the poly a bit longer and it goes up the wall a small bit. Spray foam will usually be applied with an average of 1. Provides moisture resistance You need a certain minimum ratio of exterior (rigid foam) to interior (batts) R values to avoid moisture issues with the sheathing. This is what siding makers expect, and recommend. Variables include: Rim Joist Spray Foam. OSB sheathing 2. Of course the foam is only as good as the substrate it is sprayed to. 5 to 4 per inch. The issue is that any kind of rigid foam reduces the drying ability of the sheathing, so you need that minimum R value ratio to keep the average temperature of the sheathing high enough to limit the moisture risk. The room is already insulated on the walls with R-11 and R-3 foam board. Follow the rules. Note the 2 lb/ft3 spray polyurethane foam enhancing the air seal around the extended rafters. Furthermore, installers must wear masks, respirators, and other protective gear to minimize the risk of inhaling spray foam. Excellent air sealing. " From personal experience, spray adhesives such as the 3M Hi-Strength 90 Spray Adhesive can significantly expedite attaching foam boards to concrete. I just wanted to know if it would be worth the cost and time to put in something like 2" Comfortboard over the top (the underside of the floor joists). Foam Board vs Spray Foam Closed-cell spray foam, on the other hand, comes with a fully closed-off formula. However, the former is way better for minimizing heat conduction. The walls are 2x4 on 16" centers with fiberglass batt insulation, plywood sheathing (or possibly OSB), house wrap, and vinyl cladding. SR screws come in many lungths. Spray Foam Insulation/Energy/Building Envelope Q&A Questions and Answers and Technical Forums about Foam Insulation, Foam Roofing, Foam Equipment and Building Code Issues on SprayFoamMagazine. Remember open-cell spray foam is risky in all climate zones, and if open-cell spray foam is installed Types of Spray Foam Insulation. The insulation is supposed to be R31 (I believe they said it was 4-1/2" thick). 2 foam - a good ratio but not if cool air gets in the gap. does anybody know if spray foam will succesfully stick to the XPS foam? Another option is to simply cut out the 1/2" XPS (remove large rectangles ), and spray Comparing Rigid Foam Board with Spray Foam Insulation . High R-value (around R-6 to R-7 per inch for closed-cell foam). Overall, you can put drywall over spray foam, foam board, and blanket (batts) insulation. The 3/4" V joint t+g pine over spray foam does not meet the specific requirements of R316. With more than 15 years of experience insulating thousands of pole barns across the lower peninsula, RetroFoam of Michigan knows what the best way to insulate a pole barn and what will work in the structure and what may not be the best fit. Mineral Wool Insulation. Blogs. What size/source did you use for your rock wool? It’s already made a noticeable comfort difference, but should I beef up the insulation in the knee wall with fiberglass over the spray foam? 2″ of spray foam is only R12. For sake of brevity, I will limit this discussion to only as it pertains to post frame buildings with widely spaced trusses and purlins on edge. 50 to $7. When you combine this incentive with all the other energy-saving, cost-cutting benefits of spray foam insulation, the decision is a no-brainer! Here’s what you need to know about the tax credit and how you Spray foam can be installed over a TPO roof if a cover board is installed first over the existing TPO. A vapor barrier may also be needed but depends on a range of factors explained below. Once you install this foam, there is no way moisture or air can come through. Plus 2" foam board in a 3-1/2" depth stud bay leaves 1-1/2" of air between the foam and the interior drywall, which helps boost overall R value a little bit (not sure how to quantify the R-value of the air space). But it will adhere to the perlins/ girts and trusses. On the other hand, foam board insulation maintains its shape and insulating value over time. of rigid polyisocyanurate insulation. Durability. On a finished building I still question whether there is any cost saving of a pole building over a regular framed one. removing it. EPS boards are usually white to distinguish them from other types of foam board insulation. Foam board is a simple-to-use and cheap insulation material, which is perfect if you want Jim, thanks for the reply, I was planning to leave the foam inside. Here's Why You Should Use Spray Foam over Fiberglass. Many such roofs have failed over the years, however, so don’t get creative. Cost for two kits probably around 800. I am curious as to whether the first layer of OSB could be omitted if the foam board did not react to If it's spray foam then it will stick to the glass on its own and the seams where there is silicone won't cause a problem for the rest to hold in place. One of the best techniques for protecting structures is, without a doubt, polyurethane thermal protection. ), also in Ohio. 5″ 25 psi), and 2×6 joists over the foam (using joist hangers); maybe a 1″ of spray foam over the layer of rigid foam (to air seal); fill the empty cavity between the foam and the underfloor with fluffy insulation. I have been running my own very successful residential remodeling business for over 20 years now and have torn out dozens of walls etc that were put together that way because they were full of black mold and The foam board is 20psi. Each board is glued in place with construction adhesive (compatible with foam board) and I am filling the perimeter with canned spray foam (GreatStuffPro) from a dispensing gun. My house is a walk-out, so I have a combination of poured concrete walls and above-grade 2x6 stud-framed wall in the basement level. +2x6 studs+ 2 inches expanded polysterene board cut to fit inside the stud space+spray foam at the junction of the foam board and the studs to plug any gaps+ 3. ¹ Additionally, open-cell foam is more porous and can absorb moisture, leading to mold problems and structural damage over time. During one of my projects, the quick-drying nature of the spray adhesive allowed for a • Seal top and bottom of the foam board using spray foam from a can (Great Stuff) so it acts as a vapor barrier • Frame basement wall – leave 1 inch gap between foam and framed wall to allow for air flow. By using complementary insulation types, you can Spray foam insulation typically has a higher R-value and can be applied in inaccessible and hard-to-reach places. ) in any air Both spray foam and foam board insulation come with impressive thermal insulation scores. The edges will be sealed with spray foam. So that's R-12. R-4: EPS foam boards have an R-value of approximately 4 per inch of thickness. If the spray foam is having trouble sticking to the foil layer, use a medial layer of foam board. Open-cell spray foam – Less dense, provides soundproofing but lower R-value. They said they do this all the time. 4 since I doubt you can find where it has been tested to NFPA 275 requirements. The foam baord is a good idea and it's OK to apply it directly over the boards with SR directly on it. I mean like 4+ inches of spray foam encapsulating the romex cables. It comes in standard sheets and in many thicknesses. I have sheets of 1" XPS available, so I was thinking about layering the XPS rigid foam Although foam board is used for a variety of purposes, its primary use in construction is to improve insulation. 3. John Shockney. Not in Michigan? No problem! Find your local RetroFoam dealer: https://www. I also wonder about spraying closed cell foam down, then putting in xps or eps Step 4 – apply spray foam roof. Leaving siding would strictly be a cost saving measure. I know that some types of foam (Styrofoam for instance) will melt under resin application, didn't know if somebody here had previous Polyurethane foam. What you want to avoid is voids where moisture can accumulate, so if you put a thick layer of spray foam up, you want to make sure the foamboard doesn't pull away from the wall. 1. I've narrowed my choices down to either spray foam insulation or rigid foam board insulation, both between the studs You can spray foam directly over foam board without problems -- I've done this myself in the past. And today, I’ll be answering the question of whether foam I would like to use 2-3" of closed-cell spf and fill the rest with either 3. The proper technique is stud - sheathing - foam board - spacers/lath over studs - siding. ft. I thought of taping it on top of the wood subfloor and putting the studs over top. Foam board insulation is more expensive than traditional batt insulation, so use it only when moisture is a factor and it makes I am in Climate Zone 6 (on the Atlantic coast of Nova Scotia). Spray foam insulation is the best way to insulate a rim joist in my opinion. A) Lay a layer of rigid foam (1. 5 per inch usually — can be applied nearly anywhere without leaving gaps and lends itself well to installation alongside or over existing insulation. Mattress Protectors: What To Know Before You Buy. Currently, my wall assembly will be as follows from the inside out:- drywall- poly vapour barrier- 2x6 16in OC stud frame with R24 fiberglass batts in the cavity (still thinking about changing Would it be okay to spray foam over this conduit? Thanks for your help. Green Building Advisor. Read also: Spray Foam vs Batt Insulation Pros and Cons Spray foam creates an air seal that will keep the outside air from getting inside, reducing drafts near your floorboards. Yes, you can use spray foam over rigid foam. Using Spray Foam with Exterior Foam Board – This is probably the most common approach to exterior foam insulation. OSB sheathing 4. . Rigid foam boards, like Spray foam insulation offers several benefits over other types of insulation: Air-Sealing Qualities: Spray foam insulation provides an excellent air barrier, eliminating drafts and reducing energy loss through air leakage. It seems in my project I will have to spray foam into a wall cavity , which is insulated (UNDER the sheating ) with a 1/2" XPS Foam. I already have 2″ of spray foam in there, and the bays are only 5. Landmark Recovery – Spray foam over an existing gravel built-up roof – 23,600 sq. From my experience working with foam board insulation over the years, I’ve found that selecting the right type of Spray foam kits come with extra tips, but it’s still important to (1) clear the room of everything that could get in the way, (2) decide which areas you’ll spray first, (3) put ladders wherever you need them, and (4) set up a fan or two to vent the fumes outdoors. Finish out the space if this is an interior area or if it’s an attic, just leave it open. 6 per inch, suitable for less extreme temperature zones. The combination of the TapCon anchors & the spray foam expanding under & between the studs will lock the dimple wrap in tight & you won’t ever need to worry about it coming down. Open cell spray foam has great sound dampening qualities to keep the noise from your basement rec room from Foam Board vs. Because of its more stable, dense, and more importantly, rigid formula, while painting over the closed-cell spray foam insulation board, sealing is not necessary. If you have thin foam board (less than an inch or so), it will be Spray foam cures from the chemicals that are mixed inside the spray gun, if properly mixed it will cure no matter the surface. I'm planning on doing the same thing with my 30x40 (eps foam between the girts, and rock wool. What is Foam Board Pole Barn Insulation? Simply put, it is a wall insulation method that involves placing rigid insulation boards on a pole barn. Spray foam cannot be installed over an existing TPO roofwithout a cover board. Reply. ” I purchased about 600 bdf of spray foam, and had planned on using it for my rim joists of my baasement (about 200 board foot of it). Asphalt shingles. Because it fills spaces thoroughly, it creates superior air seals and locks out moisture effectively. The 2 inches of rigid foam board gets me R10. Some roofing Spray foam insulation can be used in conjunction with foam board insulation to enhance overall insulation performance. R316. Rockwool offers an R-value of max 3. What you want to avoid is voids where moisture can accumulate, so if you A lot of times, a roofing contractor will mechanically attach a wood fiber board, and then they will spray foam directly to that board. HVAC Seer explains there has to be something covering the foam board insulation since it’s incredibly When I realized that the spray foam pushed the rigid foam piece away from the rim board after I had already done about 50 of the 80 rim joist areas, for the remaining 30, I have glued the first piece to the rim board with PL 300, and then glued the second piece to the first piece before applying the spray foam. The design includes a 2x6 ledger board at the bottom and top of the wall, as well as 2x4 studs that are installed on edge to provide wall cavities that can hold a 3 inch Had my attic ceiling spray foam insulation done. 1-5/8" is standard for ceilings. Thanks for your help. I'll be having spray foam installed to 3" thick on It is a nonstructural insulation that can achieve a nominal R-value of R-3. Spray foam would have been easy enough but, I wanted finished walls and ceiling so, cost for spray foam seemed like a wash. The reason for the intermediate layer is because in many cases, the spray foam does not attach well directly to the pure aluminum radiant barrier. “It doesn’t make sense to me to have 7 in. vnn oevbuem hqoodp uon ifkie txxqigp sevj nlkafve shbhzd igfon exhui mmjjn nkiwwx labz fsyz