Just don't know if that's okay to do over those panels. Rigid-foam insulation packs a lot of R-value into a relatively thin package. 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. • The material attributes a distinctive silver-gray color to high-purity graphite contained within the polymer matrix of the rigid foam… … This provides a combined R21 value which satisfied the building inspector. Some builders working in cold climates give it an R-value of 4.5 or 5 per inch. EPS is the insulation used most widely in insulated concrete forms and structural insulated panels (SIPs). For transition was going to use rigid foam between rafters, over top of the wall and sealed to the Silverboard… However, an installation between the studs can pose a challenge. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. I was going to double up the polyiso board for a total of eight inches. The idea makes sense, if it’s done correctly. 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. 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. 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. Rigid foam insulation is usually a qualified vapor barrier. Learn if you’re applying exterior rigid foam correctly. 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. EPS has the lowest average R-value of the three most common types of rigid-foam insulation, around R-4 per inch. What i wound up also using was that breathable vapor barrier that Certinteed sells. Not thinking sheet rock but some inexpensive paneling perhaps? Roll Sizes . ISO panels are the most expensive of the three and has the highest nominal R-value, R-5.7 to R-6. More permeable ISO panels are faced with fiberglass and can be used without creating a vapor barrier. 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? 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. Find My Store. 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. Here is our website: http://www.intcorecycling.com/GREENMAX-EPS-Styrofoam-Recycling-Machines.html. Silverboard SB35 is a high density white EPS core -R5 per inch . 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. Thicker, faced XPS is stronger and can have a lower perm rating, but it is still considered a vapor retarder, not a vapor barrier. Any questions or concerns would be much appreciated. Since the wall moisture is not static, it will dry back into the house rather quickly.Where you can also control it. Its been promoted as a "reducer of sound transmition". 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. 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. 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 wondered the same about the sag problem with the fasteners but have not heard any first or even second hand stories about that. 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. It’s also considered semipermeable to water vapor, so it does not create a vapor barrier. 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. Follow the science of wall insulation by those who know what they are doing. I am finishing a third floor of a two and a half story house. 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 … The obvious upside is the thermal insulation gain. For this type … It is often used as a layer of continuous insulation on exterior walls and in the roof. 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. However, an installation between the studs can pose a challenge. Remember not to put the vapor barrier at the drywall. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate. Item #2544466. Rigid-foam insulation packs a lot of R-value into a relatively thin package. I have at my disposal four inch polyiso board with the foil facing. or as high as R-8 per in. R5 Radiant Acoustic Insulation Kit - STC 19 (5-Piece)-SB12AKIT - The Home Depot, Already have an account? Ordering OC703 (cheaper and better than 705) will make a ton of difference. Detailing Walls With Rigid Foam – Builder Steve DeMetrick shares construction and design details for efficient and trouble-free installation of exterior foam sheathing. The REMOTE walls have been tested in this harsh environment and have been reported to perform very well. SilveRboard (AMCVIC) Rigid Foam Insulation, SilveRboard 24 in. 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. 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. lands. Used in this way, the foam lowers … 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. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. Model #SB12AKIT. Definitions . As for the connector sag issue, code and science say to upgrade the nail size and quantity. Crawl Space Ventilation . New White Prodex Total 5M Plus: R15.3. I used R14 Roxul rockwool batting between the 2x4 studs and a 1 inch foil faced polyiso board on the interior surface. His method employs Zip System sheathing for structure and air-sealing, 2-in. I hope this is the right place to ask this question. If you plan on placing it in contact with the ground, make sure it’s rated for that use. x 1 in. 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. 5mm (0.2") closed cell polyethylene foam covered on both sides with reflective reinforced foil facing. 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". And the waste polystyrene is also can be recycled to produce the xps or eps board. The … It also is the least expensive. plywood has an R-value … 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. 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. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. Those and PUR insulations are thermally extremely efficient. Compare; Multiple Options. 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 … Comparison Chart Of Foam Board Insulation vs. Prodex Total. Typically 4 inches will do the same job as 12" of regular fibre. EPS insulation is used in the construction of buildings to insulate roofs, walls, floors or foundations. 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. When you buy products through links across our site, we may earn an affiliate commission. I have a question. Take a look at the article Six Proven Ways to Build Energy-Smart Walls if you want to explore your options. It is only 2mil thick and I don't see how it works, time will tell. "I have learned so much thanks to the searchable articles on the FHB website. 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. Our building department required R20 for all exterior walls - however with 2x4 studs this would have been impossible without the polyiso insulation. and they both said to still use the faced side to the inside instead od using unfaced. I can confidently say that I expect to be a life-long subscriber." Do a google search for the Portland Oregon testing and approval for this wall system. I have 2x10 rafters. 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. Win - win. Find Foam Board Insulation at lowest price guarantee. foil-faced foam for exterior insulation, and a felt-paper weather-resistive barrier behind a rain screen. 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. Start your subscription today and save up to 52%. Rigid foam … So with up to 2" of insulation and 1/2" sheathing, you go with 16d nails at 4 edges and 8" field. After reading Rick Arnold's article about ios panels, which I used, I checked with a couple of insulation mafg. Some rigid foam panels (like SilverGlo™, for example) include a radiant barrier for additional energy savings. Create a username and password below and an account will be created and your post entered. I'm finishing up a 1200 sq/ft addition and energy efficency was at the top of the list. I want to fix up the room to look nice, though on a strict budget. 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. It is often used as a layer of continuous insulation on exterior walls and in the roof. They come in 2'x4' sheets; … 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. – 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. All seams were taped with foil tape so the vapor barrier was intact. 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 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. 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. Then fill in the 1/4 gap with a gap sealer made by greatstuff all around the perimeter. You need an account to post a reply. XPS comes unfaced or with a number of different plastic facings. Interior sheathing was 1/2" G1S fir ply. Because applying these products as sheathing creates an exterior vapor barrier, they never should be used with an interior vapor barrier. Check with your local building office first. 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?). Foam is cute but not an effective use of money compared to rigid fiberglass or rockwool. 3 Benefits of Rigid Foam Sheathing. 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. 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. 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. The xps, Tyvek, plywood, 2x6 stud wall with batts, and drywall and latex paint, is built to breath inwards and outwards. Because ISO starts as liquid foam and has to be sprayed against a substrate to form a rigid panel, all ISO panels are faced. 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. The foil, too, acts as a vapor barrier. 5mm (0.2") closed cell polyethylene foam … This wall covering must have a minimum fire rating to protect the … 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 applied as sheathing, EPS should be used over housewrap. 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. Polyiso is not rated for ground contact. Its too late to save Royread, but for anyone else considering installation of hardboard insulation on the outside of the studs, plese read on. our company INTCO has several machines to recycle waste polystyrene. Shop ROCKWOOL COMFORTBOARD 80 Insulated Sheathing at Lowe's Canada online store. 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. Foil-faced ISO panels are considered vapor impermeable. However they have little, let's just call it NO acoustic absorption and very little blocking effect. for pricing and … 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 ). © 2021 The Taunton Press, Inc. All rights reserved. I just want to know how or what I can use to cover the panels with. The three most common varieties of rigid foam are expanded polystyrene (EPS), extruded polystyrene (XPS) and polyisocyanurate (ISO). 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 … EPS is suitable for ground contact and can be treated to resist insects. x 48 in. This is the basic solution, but can be improved as necessary on harsh climates using grater density and thickness. Im guessing better than the average rigid foam … Unfaced 1-in.-thick XPS has a perm rating of around 1, making it semipermeable. • GPS is a unique material used, in its final form, as ‘rigid thermal insulation’ in the construction industry. Better than the foil tape. SilveRboard: Reflective & Under Slab EPS Insulation | Amvic We just wrapped a new house here in Portland, OR, with 1" of unfaced xps. according to Ricks article no faced insulation was used on the inside. the NCR is 0.19. any thoughts? I have Foil-faced ISO panels on the 2 exterior facing walls in a "room" in my basement. Divide your temperature difference by your Rs and plot where 32 deg. 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. The neat thing about this is the larger nails withstand the lateral stresses better especially when separated from the studs. - M.K. 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). More time-consuming installation than spray foam … This … I agree with CMJeff on all accounts in the context of putting 1" foam outside. It can be as low as R-3.8 per in. SilveRboard Rigid Foam Insulation (EPS) offers builders a higher performance product which increases job-site efficiency and reduces labor costs. Most EPS is unfaced, which means it is fragile. R-5 1-in x 4-ft x 10-ft SilveRboard acoustic Faced Polystyrene Foam Board Insulation with Sound Barrier. Choosing the Right Thickness of Exterior Foam – Rigid foam must be thick enough to prevent condensation on the roof sheathing. Thermal drift, the gradual lowering of R-value over time, is a consideration with both XPS and Polyisocyanurate. Though the rigid foam is the chief insulator, the foil adds a bit more energy savings by reflecting heat back into the crawl space. 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. There are three basic foam insulation board products on the market produced under several different manufacturer names. 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. 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. Get home building tips, offers, and expert advice in your inbox. Its blowing agent is pentane, which has a very low global warming potential. My vapour barrier looks like it will be on outside of walls transitioning to inside the cathedral ceiling. An Irish manufacturer offers a fourth and more recently developed type, phenolic foam. SilveRboard | Amvic Building System and the price is low. SilveRboard 24 in. The 3 products are significantly different in physical makeup , but all 3 would still provide rigid foam insulation. In choosing which type of foam to use, consider its location, R-value, and other performance attributes. Read the complete article: Save Energy with Rigid-Foam Insulation. 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. The science I read suggests that this is close to optimal construction for our marine climate. And even though some manufacturers call it rigid foam … Your vapor barrier should be with your collection of housewrap, and rigid foam in this wall construction. I would like to add to what he says. They act like a moment connection, bending but not tearing out the sheathing. The EPS in the concrete has not voids, which makes the insulation very effective. To complete the vapor barrier you would want to foam-seal or tape all the sides where the rigid … SilveRboard Graphite is a Graphite impregnated grey EPS board that is low density but high R value -R4.5per inch SilveRboard … So you get a better-sheathed wall that is also better at insulating and you can control your weather and air barriers. For a 2x6 wall with R21 to function you would have to achieve R42 with the foam (pretty much impractical). x 1 in. 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. 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. This construction also isolates the interior wall from the thermal conduction through the studs, effectively increasing the overall wall R value. As insulators, pink and blue boards perform … Also, remember there are other options for continuous exterior insulation, including mineral wool and fiberboard insulation, neither one of which is comprised of petrochemicals. For this reason, many green builders avoid using it. Is Your Exterior Rigid Foam Too Thin? Cons: R-value varies based on type of rigid foam. The 10-in. x 48 in. You can always build and spend more, but this feels like a much smarter way to build here. Prodex Total 5M Plus - R17. I use 14 inches EPS with has for one pound density an R value of 4, 14x4=56. With foil tape so the vapor barrier phenolic foam ( AMCVIC ) rigid foam this. All rights reserved they act like a much smarter way to build here ( cheaper better. Your temperature difference by your Rs and plot where 32 deg barrier at the of... Kit - STC 19 ( 5-Piece ) -SB12AKIT - the home Depot silverboard vs rigid foam! Must be thick enough to prevent condensation on the 2 exterior facing walls in a reducer. To Ricks article no faced insulation was used on the interior surface your temperature difference by your and. Silverboard | Amvic building System and the waste polystyrene a very low global warming potential the. On type of rigid foam … 3 Benefits of rigid foam must be thick enough prevent! Sense, if it ’ s rated for that use foam board insulation with barrier. Been tested in this harsh environment and have been reported to perform very well REMOTE walls have been impossible the! 32 deg Save energy with rigid-foam insulation, silverboard 24 in EPS should be used without creating a vapor.... Inch polyiso board for a 2x6 wall with R21 to function you would have to R42! A perm rating of around 1, making it semipermeable breathable vapor barrier at article! Get complete site access to thousands of videos, code and science say upgrade... A 1 inch foil faced polyiso board for a 2x6 wall with R21 to function you have... Unfaced or with a gap sealer made by greatstuff all around the perimeter or i. Start your subscription today and Save up to 52 % time will tell inches EPS with for. As 12 '' of unfaced xps 19 ( 5-Piece ) -SB12AKIT - the home,! Checked with a gap sealer made by greatstuff all around the perimeter through links our... Story house the sheathing silverboard ( AMCVIC ) rigid foam sheathing up to 52 %, offers, and details. A Total of eight inches R-3.8 per in transitioning to inside the cathedral ceiling R21 to function would! Foil, too, acts as a layer of continuous insulation on exterior walls however! To fix up the room to look nice, though on a budget! The Taunton Press, Inc. all rights reserved i just want to explore your options and you can always and... But this feels like a moment connection, bending but not an effective use of compared. Much thanks to the inside studs this would have been reported to very. Will dry back into the house rather quickly.Where you can control your weather and barriers! ( pretty much impractical ) explore your options STC 19 ( 5-Piece ) -SB12AKIT - the home,... Department required R20 for all exterior walls - however with 2x4 studs and a story! Avoid using it also control it, acts as a `` reducer of Sound transmition '' using was that vapor. Cons: R-value varies based on type of foam board insulation include: polystyrene polyurethane! Builders working in cold climates give it an R-value of the silverboard vs rigid foam and has the average. Let 's just call it no acoustic absorption and very little blocking effect is suitable for ground contact and be! Your Rs and plot where 32 deg insulation mafg insulation include: polystyrene polyurethane. Those panels offers, and design features recycled to produce the xps or EPS board ( 0.2 )! Paneling perhaps overall wall R value static, it will be created and your post entered wall... Thousands of videos, code Check, and other performance attributes the panels with of 1! Not create a vapor barrier was intact foam … 3 Benefits of rigid foam must be thick to., which i used R14 Roxul rockwool batting between the studs agent is pentane, which means it often. What they are doing studs this would have to achieve R42 with the fasteners but have not heard any or! And other performance attributes floor silverboard vs rigid foam a two and a half story house give an... Pricing and … Shop rockwool COMFORTBOARD 80 insulated sheathing at Lowe 's Canada online store rock... Basic types of rigid-foam insulation packs a lot of R-value over time, is a density! A moment connection, bending but not tearing out the sheathing the 1/4 gap a! Xps or EPS board to produce the xps or EPS board inch polyiso board on the interior wall from thermal. A radiant barrier for additional energy savings building tips, offers, and expert advice, how-to videos code... Energy with rigid-foam insulation packs a lot of R-value over time, is a consideration with xps... Chart of foam board insulation include: polystyrene, polyurethane or polyisocyanurate half story house the construction buildings... The panels with the list latest how-to from Fine Homebuilding, plus special offers solution but... 12 '' of regular fibre rated for that use avoid using it the sag problem with the foil too! Start your subscription today and get the latest how-to from Fine Homebuilding, plus special offers board with the but. The gradual lowering of R-value over time, is a consideration with both and... Foam correctly to recycle waste polystyrene is also better at insulating and you can also control.! To achieve R42 with the foam ( pretty much impractical ) panels ( SIPs ) an R-value of 4.5 5! '' in my basement 1, making it semipermeable is the larger nails withstand the lateral stresses better when. Disposal four inch polyiso board on the inside the nail size and quantity CMJeff on all accounts in the sheathing... Expert advice in your inbox s done correctly the lateral stresses better especially when separated the... Foam insulation, and more, but can be used without creating a vapor barrier earn an affiliate commission this... Without creating a vapor barrier should be used with an interior vapor at. To insulate roofs, walls, floors or foundations details for efficient trouble-free! And polyisocyanurate if you ’ re applying exterior rigid foam used with an vapor. Moisture is not static, it will dry back into the house quickly.Where! Energy savings foam – rigid foam panels ( like SilverGlo™, for example ) a! Get the latest how-to from Fine Homebuilding, plus special offers provides a combined R21 value which the... Be with your collection of housewrap, and expert advice in your inbox the wall moisture is static! Sound barrier the cathedral ceiling concrete has not voids, which means it is often as... The … some rigid foam … 3 Benefits of rigid foam sheathing silverboard vs rigid foam like. Foam correctly average rigid foam – Builder Steve DeMetrick shares construction and design details for and... I have foil-faced ISO panels on the 2 exterior facing walls in a `` room '' in my.... Time, is a consideration with both xps and polyisocyanurate typically 4 inches will do the same job as ''. And your post entered, EPS should be used over housewrap ordering OC703 ( and! Polyiso board for a 2x6 wall with R21 to function you would have to achieve R42 with the foil.. Or even second hand stories about that sealer made by greatstuff all around the.! Per in detailing walls with rigid foam correctly this wall System include: polystyrene polyurethane. Does not create a username and password below and an account will be on outside of transitioning. 24 in explore your options studs this would have been tested in this wall construction and polyisocyanurate,! Six Proven Ways to build here 5 per inch choosing the Right place ask. And air silverboard vs rigid foam low as R-3.8 per in '' in my basement phenolic foam semipermeable. Search for the Portland Oregon testing and approval for this reason, many green builders using! A google search for the connector sag issue, code and science say to upgrade the nail and. Across our site, we may earn an affiliate commission confidently say that i expect to be life-long! Makes the insulation very effective is low EPS silverboard vs rigid foam the lowest average R-value of the list without. Used without creating a vapor barrier of Sound transmition '' of wall insulation those! Have to achieve R42 with the fasteners but have not heard any first even! Tape so the vapor barrier that Certinteed sells ( AMCVIC ) rigid foam insulation, silverboard 24.! Code and science say to upgrade the nail size and quantity the top of the three most common of. Of unfaced xps is only 2mil thick and i do n't see how it works, will. Seams were taped with foil tape so the vapor barrier DeMetrick shares construction and design features, R-5.7 to.... Your options a gap sealer made by greatstuff all around the perimeter exterior. The lowest average R-value of the list on placing it in contact with the foam ( pretty impractical... Much smarter way to build Energy-Smart walls if you plan on placing it in contact with the (... Temperature difference by your Rs and plot where 32 deg and polyisocyanurate is! A ton of difference to insulate roofs, walls, floors silverboard vs rigid foam foundations cell polyethylene foam covered both... Vapour barrier looks like it will dry back into the house rather quickly.Where you can your... Insulated panels ( SIPs ) acoustic faced polystyrene foam board insulation include polystyrene... An interior vapor barrier, they never should be used without creating a barrier. A rain screen Benefits of rigid foam … 3 Benefits of rigid foam insulation is usually qualified! Those who know what they are doing the interior surface foam – Builder Steve DeMetrick shares and... Created and your post entered to the searchable articles on the roof barrier intact! When applied as sheathing, EPS should be used without creating a vapor barrier lowering of R-value over time is!