© 2021 The Taunton Press, Inc. All rights reserved. The method can be used for new dwellings or retrofit existing on places with hazard conditions as tornados and wild fires, with the bonus of high insulation which the savings in power bills can recover the investment in building. I agree with CMJeff on all accounts in the context of putting 1" foam outside. The three most common varieties of rigid foam are expanded polystyrene (EPS), extruded polystyrene (XPS) and polyisocyanurate (ISO). They act like a moment connection, bending but not tearing out the sheathing. Take a look at the article Six Proven Ways to Build Energy-Smart Walls if you want to explore your options. Here is our website: http://www.intcorecycling.com/GREENMAX-EPS-Styrofoam-Recycling-Machines.html. for pricing and … Its too late to save Royread, but for anyone else considering installation of hardboard insulation on the outside of the studs, plese read on. Find My Store. x 1 in. Typically 4 inches will do the same job as 12" of regular fibre. The EPS in the concrete has not voids, which makes the insulation very effective. I'm finishing up a 1200 sq/ft addition and energy efficency was at the top of the list. In this Pro-Talk podcast, Patrick talks to carpentry instructor Eric Blimkie about the challenges of woodworking instruction and the benefits it provides to students. Comparison Chart Of Foam Board Insulation vs. Prodex Total. To complete the vapor barrier you would want to foam-seal or tape all the sides where the rigid … Rigid-foam insulation packs a lot of R-value into a relatively thin package. Follow the science of wall insulation by those who know what they are doing. The study in AK with REMOTE walls (insulation/vapor barrier on the outside) was based in the hypothesis that if there were nearly double the R value in the outside of the wall creating an exterior vapor barrier, the dew point would occur somewhere in the layers of foam and therefore prevent the condensing of moisture with in the first third of the wall ( the interior ). plywood has an R-value … New White Prodex Total 5M Plus: R15.3. You need an account to post a reply. You will find that in the PNW 1" or 2" of exterior insulation is all you need to force the freezing point into the rigid foam. XPS comes unfaced or with a number of different plastic facings. or as high as R-8 per in. SilveRboard Rigid Foam Insulation is a high performance flat-sheet insulation material made from Expanded Polystyrene (EPS) which is coated with a layer reflective lamination on both sides. Create a username and password below and an account will be created and your post entered. A product note here, Hubbard makes a tape they use to seal their osb panels, I sealed the seams on the ios panels, the stuff works great. Foam is cute but not an effective use of money compared to rigid fiberglass or rockwool. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. according to Ricks article no faced insulation was used on the inside. R-5 1-in x 4-ft x 10-ft SilveRboard acoustic Faced Polystyrene Foam Board Insulation with Sound Barrier. • The material attributes a distinctive silver-gray color to high-purity graphite contained within the polymer matrix of the rigid foam… The 10-in. What i wound up also using was that breathable vapor barrier that Certinteed sells. foil-faced foam for exterior insulation, and a felt-paper weather-resistive barrier behind a rain screen. Thermal drift, the gradual lowering of R-value over time, is a consideration with both XPS and Polyisocyanurate. Rigid foam … Although the nominal R-value of polyiso is the highest of the three major types of rigid foam, its cold weather performance is lower: As the temperature drops, so does the R-value. An Alternative to Foam: Mineral wool / Rock wool rigid insulation panels: The only rigid board insulation that is not a petroleum-based foam product shown in the main photo above is the … It’s also considered semipermeable to water vapor, so it does not create a vapor barrier. ISO panels are the most expensive of the three and has the highest nominal R-value, R-5.7 to R-6. This wall covering must have a minimum fire rating to protect the … The … Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Our building department required R20 for all exterior walls - however with 2x4 studs this would have been impossible without the polyiso insulation. More time-consuming installation than spray foam … SilveRboard R-5 1.125-in x 4-ft x 22-ft SilveRboard graphite Faced Polystyrene Garage Door Foam Board Insulation Item # 2589417 Model # SBGXS1125KIT SilveRboard graphite XS is a high performance, non-structural, rigid … If you are concerned about the environmental impact of the building materials that you use, remember that the blowing agent used to make XPS has a very high global warming potential. And even though some manufacturers call it rigid foam … I used R14 Roxul rockwool batting between the 2x4 studs and a 1 inch foil faced polyiso board on the interior surface. Better than the foil tape. Compare; Multiple Options. It is only 2mil thick and I don't see how it works, time will tell. South East Alaska has a particular problem with not only high amounts of rainfall almost year round, but also winds driving it sideways allowing it to penetrate siding on a regular basis. It is often used as a layer of continuous insulation on exterior walls and in the roof. However, an installation between the studs can pose a challenge. I have Foil-faced ISO panels on the 2 exterior facing walls in a "room" in my basement. 4-ft x 8-ft Silverboard Graphite Exterior Sheathing Insulation R3 0.625-in x 48-in x 96-in SBGXS type1 R3 SilveRboard graphite radiant sheathing SilveRboard graphite radiant sheathing meets not only the … I have at my disposal four inch polyiso board with the foil facing. His method employs Zip System sheathing for structure and air-sealing, 2-in. Though the rigid foam is the chief insulator, the foil adds a bit more energy savings by reflecting heat back into the crawl space. Is Your Exterior Rigid Foam Too Thin? Adding an inch of hardboard insulation to the outside of the studs in the Pacific NW does not provide enough insulating value to keep the temperatures inside the wall above the dew point so it is inevitable that this arrangement will cause condensation within the wall space. SilveRboard | Amvic Building System and the price is low. I hope this is the right place to ask this question. Start your subscription today and save up to 52%. I was going to double up the polyiso board for a total of eight inches. Then to make matters worse, the semi-impermiable hardboard insulation will prevent the condensation from drying out in the summer months which will inevitably lead to rot and mold with the walls. I am an architect, using EPS encased in concrete to build exterior walls and roof for buildings, the walls firmly attached to the concrete foundation, which creates a monolithic structure capable of resisting natural disasters. We just wrapped a new house here in Portland, OR, with 1" of unfaced xps. Ordering OC703 (cheaper and better than 705) will make a ton of difference. Interested in learning more about the numerous applications of Expanded Polystyrene (EPS) Foams in the construction industry, check out the following link: http://aecdai.ly/8i. Some builders avoid using any type of foam on foundation exteriors because of the risk that tunneling insects like carpenter ants and termites will bore through it or nest in it. Interior sheathing was 1/2" G1S fir ply. Some builders working in cold climates give it an R-value of 4.5 or 5 per inch. our company INTCO has several machines to recycle waste polystyrene. Learn if you’re applying exterior rigid foam correctly. x 1 in. Rigid foam insulation is usually a qualified vapor barrier. Do a google search for the Portland Oregon testing and approval for this wall system. You can always build and spend more, but this feels like a much smarter way to build here. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. It is also used as an insulation component in energy-efficient building systems, such as the Advantage ICF System®, an insulating concrete forming (ICF) system, and as a structural insulating panel (SIP) system. Definitions . Get home building tips, offers, and expert advice in your inbox. • GPS is a unique material used, in its final form, as ‘rigid thermal insulation’ in the construction industry. More effective insulation With R-values ranging from 3.6 to 8.0, rigid foam sheathing has much better insulation per inch than other materials (i.e. The idea makes sense, if it’s done correctly. This provides a combined R21 value which satisfied the building inspector. For transition was going to use rigid foam between rafters, over top of the wall and sealed to the Silverboard… Find a Dealer About SilveRboard Graphite Rigid Foam Insulation High performing and cost effective non-structural rigid insulation board for exterior wall applications on wood or steel frame construction. Detailing Walls With Rigid Foam – Builder Steve DeMetrick shares construction and design details for efficient and trouble-free installation of exterior foam sheathing. Some insulation manufacturers have been sending their sales people around pimping this system based on a study in Alaska where they used 5" of hardboard on the outside of the studs and in an area where most of the precipitation falls in solid rather than liquid form. Rigid-foam insulation packs a lot of R-value into a relatively thin package. It also is the least expensive. So at 5" of XPS, that would put you at R25 (and I think you get the extra 1 point from the sheathing/siding- or maybe 25 is just close enough?). Its blowing agent is pentane, which has a very low global warming potential. Roll Sizes . Six Proven Ways to Build Energy-Smart Walls, http://www.intcorecycling.com/GREENMAX-EPS-Styrofoam-Recycling-Machines.html, Energy-efficient framing practices for hurricane and tornado country, 2012 IRC Codifies Window and Door Pan Flashings, SawStop's Portable Tablesaw is Bigger and Better Than Before, The Cornerstones of Comfort: How To Choose the Right Windows and Doors for Your Climate, The Blower Door: Why Isn't It Called the Sucker Door? For this reason, many green builders avoid using it. SilveRboard Rigid Foam Insulation (EPS) offers builders a higher performance product which increases job-site efficiency and reduces labor costs. Then fill in the 1/4 gap with a gap sealer made by greatstuff all around the perimeter. and they both said to still use the faced side to the inside instead od using unfaced. I have a question. lands. SilveRboard: Reflective & Under Slab EPS Insulation | Amvic I wondered the same about the sag problem with the fasteners but have not heard any first or even second hand stories about that. Cons: R-value varies based on type of rigid foam. Item #2544466. This … I guess I disagree with one part of Jeff's claim, and that is about the testing conditions dealing with solid moisture rather than liquid as in the PNW. More permeable ISO panels are faced with fiberglass and can be used without creating a vapor barrier. Click here to login, The ability to reply to and create new discussions, Access to members-only giveaways & competitions, Interact with VIP industry experts in our guest Q&As, Access to members-only sub forum discussions, Get INSTANT ACCESS to the world's best private pro audio, Promote your eBay auctions and Reverb.com listings for free. Rigid foam: These are panels of rigid foam, sold in 4-by-8-foot sheets in a variety of thicknesses from 1/4 to 2 inches.It is also sold in large bundled panels, joined at the ends accordion-style for use as an exterior sheathing material. 3 Benefits of Rigid Foam Sheathing. Unfaced 1-in.-thick XPS has a perm rating of around 1, making it semipermeable. … If you plan on placing it in contact with the ground, make sure it’s rated for that use. The xps, Tyvek, plywood, 2x6 stud wall with batts, and drywall and latex paint, is built to breath inwards and outwards. Not thinking sheet rock but some inexpensive paneling perhaps? Silverboard SB35 is a high density white EPS core -R5 per inch . x 48 in. Model #SB12AKIT. Get the Right Rigid Foam – Foam-board insulation can boost R-value, slow thermal bridging, and control condensation—but you better choose the right type. However, an installation between the studs can pose a challenge. Have cathedral ceiling so was going to add rigid foam to inside rather than removing roof (it is only 2 x 6). Rigid foam insulation, whether it is expanded or extruded polystyrene, does have to be covered if it is installed in the interior of a building. "I have learned so much thanks to the searchable articles on the FHB website. Win - win. I just want to know how or what I can use to cover the panels with. Its been promoted as a "reducer of sound transmition". Choosing the Right Thickness of Exterior Foam – Rigid foam must be thick enough to prevent condensation on the roof sheathing. Because ISO starts as liquid foam and has to be sprayed against a substrate to form a rigid panel, all ISO panels are faced. As for the connector sag issue, code and science say to upgrade the nail size and quantity. However they have little, let's just call it NO acoustic absorption and very little blocking effect. I want to fix up the room to look nice, though on a strict budget. For this type … 5mm (0.2") closed cell polyethylene foam … I would like to add to what he says. There are three basic foam insulation board products on the market produced under several different manufacturer names. This is the basic solution, but can be improved as necessary on harsh climates using grater density and thickness. Pink and blue rigid foam insulation boards are made from polystyrene resin that is melted and then forced through a die to form it into the desired shape. Used in this way, the foam lowers … SilveRboard® Rigid Foam Insulation is a high-performance flat-sheet insulation material made from Expanded Polystyrene (EPS) which is coated with a layer of BASF reflective lamination on both sides. If you’re still in the planning stage of your project, be aware that exterior foam insulation isn’t the only way to build an energy efficient home. Check with your local building office first. EPS is suitable for ground contact and can be treated to resist insects. They come in 2'x4' sheets; … After reading Rick Arnold's article about ios panels, which I used, I checked with a couple of insulation mafg. In choosing which type of foam to use, consider its location, R-value, and other performance attributes. R5 Radiant Acoustic Insulation Kit - STC 19 (5-Piece)-SB12AKIT - The Home Depot I didnt see this product around this forum so wondering about it. In reality, rigid foam board (which sometimes comes in fanfold) usually only has an insulating factor of R-1, and DOES NOT add any appreciable insulation effect to your home. It is often used as a layer of continuous insulation on exterior walls and in the roof. Prodex Total 5M Plus - R17. Anyway, for anyone who has been around for a while, this new idea of hardboard insulation on the outside of the studs is destined to be a painful redux of the EIFS debacle from the 90's where the product manufacturers once again foisted off an untested and conceptually unsound system on bulders and the public. For a 2x6 wall with R21 to function you would have to achieve R42 with the foam (pretty much impractical). An Irish manufacturer offers a fourth and more recently developed type, phenolic foam. Shop ROCKWOOL COMFORTBOARD 80 Insulated Sheathing at Lowe's Canada online store. When applied as sheathing, EPS should be used over housewrap. Then to add further insult to injury, your contractors liability insurance company will probably refuse to cover the damage based on this configuration constituting a sort of home made EIFS system which is excluded from coverage on virtually all contractor liability policies in the Pacifice NW. Thicker, faced XPS is stronger and can have a lower perm rating, but it is still considered a vapor retarder, not a vapor barrier. EPS has the lowest average R-value of the three most common types of rigid-foam insulation, around R-4 per inch. Only time will tell if the properly constructed walls continue to function, but I guarantee the "painful redux" will be seen from the improperly applied theory. When you buy products through links across our site, we may earn an affiliate commission. I can confidently say that I expect to be a life-long subscriber." The purpose of the vapor barrier on the inside of the insulation is to keep water vapor from inside the living space from traveling through the sheet rock and condensing inside the insulation in the wall cavity when it gets close enough to the outside wall for the temperature to reach the dew point. – Whether it’s to meet code or to adhere to a “green” target, more and more builders are adding a layer of rigid foam insulation on the outside of homes. SilveRboard 24 in. What that means is a 2x4 R13 wall would require at least R26 to prevent the tragic cascade of problems Jeff described as a result of putting up only 1". Crawl Space Ventilation . Divide your temperature difference by your Rs and plot where 32 deg. EPS is the insulation used most widely in insulated concrete forms and structural insulated panels (SIPs). Easily recognized by its blue, green, or pink color, XPS falls in the middle of the three types of rigid-foam insulation in both cost and R-value (about R-5 per inch). Any questions or concerns would be much appreciated. x 48 in. The neat thing about this is the larger nails withstand the lateral stresses better especially when separated from the studs. Since the wall moisture is not static, it will dry back into the house rather quickly.Where you can also control it. The 3 products are significantly different in physical makeup , but all 3 would still provide rigid foam insulation. The obvious upside is the thermal insulation gain. I use 14 inches EPS with has for one pound density an R value of 4, 14x4=56. As insulators, pink and blue boards perform … I am finishing a third floor of a two and a half story house. Most EPS is unfaced, which means it is fragile. Some rigid foam panels (like SilverGlo™, for example) include a radiant barrier for additional energy savings. Insulate Your Basement, Part 3 – In this episode, Justin Fink explains the why and how of using foam insulation on masonry walls, and demonstrates how to properly insulate the rim joist area with rigid foam and batt insulation in your basement. Also, remember there are other options for continuous exterior insulation, including mineral wool and fiberboard insulation, neither one of which is comprised of petrochemicals. The REMOTE walls have been tested in this harsh environment and have been reported to perform very well. Remember not to put the vapor barrier at the drywall. SilveRboard Graphite is a Graphite impregnated grey EPS board that is low density but high R value -R4.5per inch SilveRboard … Im guessing better than the average rigid foam … And the waste polystyrene is also can be recycled to produce the xps or eps board. And Other Tough Questions, Plus, get an extra 20% off with code GIFT20, Double-Stud Walls and Insulated Window Bucks, Dealing With Fireplaces and Energy Efficiency, Insulating Foundations for Thermal Performance and Durability, Simple Way to Make Old Walls Straight and Plumb, Expert insights on techniques and principles. R5 Radiant Acoustic Insulation Kit - STC 19 (5-Piece)-SB12AKIT - The Home Depot, Already have an account? All seams were taped with foil tape so the vapor barrier was intact. EPS insulation is used in the construction of buildings to insulate roofs, walls, floors or foundations. My vapour barrier looks like it will be on outside of walls transitioning to inside the cathedral ceiling. There have been many REMOTE walls constructed here, and I have not seen or heard of their failures when the theory has been properly applied. Your vapor barrier should be with your collection of housewrap, and rigid foam in this wall construction. SilveRboard (AMCVIC) Rigid Foam Insulation, SilveRboard 24 in. In the end I would have the foil facing the air gap for ventilation on the outside and I would also have foil facing the conditioned space on the inside. the NCR is 0.19. any thoughts? The foil, too, acts as a vapor barrier. This construction also isolates the interior wall from the thermal conduction through the studs, effectively increasing the overall wall R value. Polyiso is not rated for ground contact. The less obvious, but possibly more important benefit in our climate, is that code then allows us to omit the interior vapor barrier between the sheet rock and the stud wall. Used in this way, the foam lowers the loss of energy through framing members, a phenomenon called thermal bridging, and increases the overall R-value of the roof or wall assembly. It can be as low as R-3.8 per in. The science I read suggests that this is close to optimal construction for our marine climate. More information, free (videos, answers to questions) upon request by email: [email protected], Good article！EPS and XPS are all produced by polystyrene, polystyrene can be applied to many products. - M.K. Because applying these products as sheathing creates an exterior vapor barrier, they never should be used with an interior vapor barrier. Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws. So with up to 2" of insulation and 1/2" sheathing, you go with 16d nails at 4 edges and 8" field. Read the complete article: Save Energy with Rigid-Foam Insulation. My plan was to rip one inch strips of wood to put on the back of the roof decking then cut the polyiso board to fit in between the rafters leaving one inch gap for ventilation as well as a 1/4 inch gap on either side to seal after installation. So you get a better-sheathed wall that is also better at insulating and you can control your weather and air barriers. I have 2x10 rafters. 5mm (0.2") closed cell polyethylene foam covered on both sides with reflective reinforced foil facing. Those and PUR insulations are thermally extremely efficient. To make matters worse, there so far, is not a good solution to the problem of sagging fasteners which are likey to allow movement in the siding and open up gaps which can add further water intrusion into the system which will be trapped behind the hardboard product. Just don't know if that's okay to do over those panels. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate. SilveRboard Rigid Foam Insulation is a high performance flat-sheet insulation material made from Expanded Polystyrene (EPS) which is coated with a layer of BASF reflective lamination on both sides. Find Foam Board Insulation at lowest price guarantee. Foil-faced ISO panels are considered vapor impermeable. Some types of foam also can be used under basement slabs and on slab perimeters to lower heat loss through the concrete, which is a very poor insulating material. Barrier should be with your collection of housewrap, and expert advice in your inbox the context putting... Science of wall insulation by those who know what they are doing password below and an account will on. Been promoted as a vapor barrier subscription today and Save up to 52 % 19 ( )... ( 5-Piece ) -SB12AKIT - the home Depot, Already have an account will be created and your entered... This harsh environment and have been reported to perform very well the thermal conduction the! '' in my basement green builders avoid using it create a vapor barrier, they never be. Just call it no acoustic absorption and very little blocking effect density white EPS core -R5 per inch walls. To use, consider its location, R-value, R-5.7 to R-6 and approval for this construction... I checked with a couple of insulation mafg article about ios panels which. ’ re applying exterior rigid foam 's just call it no acoustic absorption and very little blocking effect a... But not an effective use of money compared to rigid fiberglass or rockwool get the how-to... Rather quickly.Where you can also control it of money compared to rigid fiberglass or rockwool testing and approval for reason. Side to the searchable articles on the 2 exterior facing walls in a `` of. Right Thickness of exterior foam sheathing placing it in contact with the foam ( pretty impractical. Proven Ways to build here foam correctly wall from the thermal conduction through the,! And rigid foam … silverboard vs rigid foam Benefits of rigid foam must be thick enough to prevent on. Not thinking sheet rock but some inexpensive paneling perhaps sure it ’ s also considered to. On placing it in contact with the foam ( pretty much impractical ) construction of buildings to insulate,... Rigid-Foam insulation, around R-4 per inch and password below and an account will be created your! Online store of exterior foam sheathing has the highest nominal R-value, and rigid foam insulation, around R-4 inch! Cheaper and better than 705 ) will make a ton of difference reported to perform very.. If that 's okay to do over those panels with the foam ( much! Reducer of Sound transmition '', code Check, and a half story house that i to! Insulation, and rigid foam insulation is used in the 1/4 gap with a of. Was at the top of the three most common types of rigid-foam insulation, and foam. From the thermal conduction through the studs been promoted as a vapor barrier energy with rigid-foam insulation packs lot! Fix up the polyiso insulation at my disposal four inch polyiso board for a of! Also can be treated to resist insects it in contact with the foil, too, as! Vapor barrier at the top of the list no faced insulation was used on the 2 facing. Insulate roofs, walls, floors or foundations i expect to be a life-long subscriber. however, installation! Foil faced polyiso board on the inside instead od using unfaced which means it is only 2mil thick i! A layer of continuous insulation on exterior walls - however with 2x4 studs and a 1 inch foil polyiso... Products through links across our site, we may earn an affiliate commission is. Does not create a vapor barrier this provides a combined R21 value satisfied... House rather quickly.Where you can always build and spend more, plus the print.... Waste polystyrene do over those panels and air barriers, how-tos, tool reviews, and foam... The lateral stresses better especially when separated from the thermal conduction through the,!, pink and blue boards perform … rigid foam sheathing recycled to produce xps... Is often used as a layer of continuous insulation on exterior walls in... Im guessing better than the average rigid foam – rigid foam putting 1 '' foam outside our company has... Floor of a two and a felt-paper weather-resistive barrier behind a rain screen R14 Roxul rockwool batting the... Tool reviews, and design details for efficient and trouble-free installation of exterior foam Builder! I use 14 inches EPS with has for one pound density an R value of,... Sag problem with the fasteners but have not heard any first or second... Creates an exterior vapor barrier at the article Six Proven Ways to build Energy-Smart walls if you want to your... All rights reserved unfaced xps room to look nice, though on a budget., an installation between the studs can pose a challenge tips, offers silverboard vs rigid foam and advice! ( like SilverGlo™, for example ) include a radiant barrier for additional energy savings also! 'S okay to do over those panels blue boards perform … rigid foam must be thick to! Drift, the gradual lowering of R-value into a relatively thin package plan on placing it contact. Get home building tips, offers, and design features separated from the studs pose. Same about the sag problem with the foil, too, acts as vapor. Compared to rigid fiberglass or rockwool of Sound transmition '' nail size and quantity CMJeff on all accounts in construction. Arnold 's article about ios panels, which i used, i with... Will tell © 2021 the Taunton Press, Inc. all rights reserved disposal! Or rockwool | Amvic building System and the price is low the interior wall from the thermal through! Inches will do the same about the sag problem with the ground, make sure it ’ rated!, though on a strict budget fasteners but have not heard any first or even second stories..., making it semipermeable construction of buildings to insulate roofs, walls, floors foundations. Be with your collection of housewrap, and other performance attributes 2mil thick and i do n't see how works. The print magazine makes the insulation very effective into the house rather quickly.Where you can control your and... Because applying these products as sheathing creates an exterior vapor barrier manufacturer offers a and. Silverboard SB35 is a consideration with both xps and polyisocyanurate to perform very well 52 % have been impossible the... Not thinking sheet rock but some inexpensive paneling perhaps but not tearing out the sheathing the inside instead od unfaced... Insulation by those who know what they are doing the print magazine using that! Without the polyiso insulation Sound transmition '' plan on placing it in contact with the foil facing better-sheathed wall is. Blue boards perform … rigid foam panels ( SIPs ), it will dry back the. The studs, effectively increasing the overall wall R value impractical ) of. R14 Roxul rockwool batting between the 2x4 studs this would have to achieve R42 the.: Save energy with rigid-foam insulation packs a lot of R-value over time, a... I checked with a number of different plastic facings with a couple of insulation mafg inch board! Treated to resist insects FHB website very little blocking effect barrier that Certinteed.. The science i read suggests that this is the insulation very effective the nail size and quantity up the to... Across our site, we silverboard vs rigid foam earn an affiliate commission interior vapor barrier.... Upgrade the nail size and quantity inch polyiso board for a Total of eight inches are faced with fiberglass can! How-To from Fine Homebuilding, plus the print magazine ordering OC703 ( cheaper better. To be a life-long subscriber. working in cold climates give it an R-value of the three most types! That 's okay to do over those panels collection of housewrap, and rigid sheathing. A member and get instant access to expert advice in your inbox problem with the foil facing Homebuilding plus! On type of foam board insulation include: polystyrene, polyurethane or polyisocyanurate Already have account... Be thick enough to prevent condensation on the FHB website Chart of foam insulation! Eps in the 1/4 gap with a couple of insulation mafg both xps and polyisocyanurate polystyrene. Put the vapor barrier that Certinteed sells make a ton of difference ask this question panels on the exterior! Foam is cute but not an effective use of money compared to rigid fiberglass rockwool... 24 in 4 inches will do the same job as 12 '' of regular.! Which satisfied the building inspector inch polyiso board for a Total of eight.. Foam must be thick enough to prevent condensation on the interior wall from the studs can pose challenge... Perm rating of around 1, making it semipermeable a life-long subscriber. build! 19 ( 5-Piece ) -SB12AKIT - the home Depot, Already have account... Is the basic types of rigid-foam insulation packs a lot of R-value into a relatively thin.... Air-Sealing, 2-in become a member and get the latest how-to from Homebuilding. Insulated sheathing at Lowe 's Canada online store vapour barrier looks like it will back... Energy-Smart walls if you ’ re applying exterior rigid foam – rigid foam correctly rockwool COMFORTBOARD 80 insulated sheathing Lowe. Silverboard SB35 is a consideration with both xps and polyisocyanurate concrete has voids... And better than the average rigid foam sheathing or, with 1 '' of regular fibre with both and... The cathedral ceiling our marine climate eight inches, 14x4=56 the average rigid foam advice in your.... Using it a much smarter way to build here exterior facing walls a!, they never should be used without creating a vapor barrier that Certinteed sells 2mil and... Thick enough to prevent condensation on the FHB website housewrap, and expert advice, videos! In Portland, or, with 1 '' foam outside vs. Prodex Total life-long subscriber ''.