Silverboard SB35 is a high density white EPS core -R5 per inch . This … It’s also considered semipermeable to water vapor, so it does not create a vapor barrier. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate. More time-consuming installation than spray foam … I used R14 Roxul rockwool batting between the 2x4 studs and a 1 inch foil faced polyiso board on the interior surface. 5mm (0.2") closed cell polyethylene foam covered on both sides with reflective reinforced foil facing. 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. 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. – 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. When applied as sheathing, EPS should be used over housewrap. Have cathedral ceiling so was going to add rigid foam to inside rather than removing roof (it is only 2 x 6). Those and PUR insulations are thermally extremely efficient. XPS comes unfaced or with a number of different plastic facings. 5mm (0.2") closed cell polyethylene foam … the NCR is 0.19. any thoughts? We just wrapped a new house here in Portland, OR, with 1" of unfaced xps. I have a question. Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. It can be as low as R-3.8 per in. They act like a moment connection, bending but not tearing out the sheathing. Im guessing better than the average rigid foam … plywood has an R-value … Any questions or concerns would be much appreciated. So you get a better-sheathed wall that is also better at insulating and you can control your weather and air barriers. 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. Typically 4 inches will do the same job as 12" of regular fibre. I hope this is the right place to ask this question. 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 ). I have at my disposal four inch polyiso board with the foil facing. Read the complete article: Save Energy with Rigid-Foam Insulation. • GPS is a unique material used, in its final form, as ‘rigid thermal insulation’ in the construction industry. Sign up for eletters today and get the latest how-to from Fine Homebuilding, plus special offers. SilveRboard: Reflective & Under Slab EPS Insulation | Amvic according to Ricks article no faced insulation was used on the inside. © 2021 The Taunton Press, Inc. All rights reserved. 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". For this type … EPS is suitable for ground contact and can be treated to resist insects. For a 2x6 wall with R21 to function you would have to achieve R42 with the foam (pretty much impractical). I have Foil-faced ISO panels on the 2 exterior facing walls in a "room" in my basement. Detailing Walls With Rigid Foam – Builder Steve DeMetrick shares construction and design details for efficient and trouble-free installation of exterior foam sheathing. Its blowing agent is pentane, which has a very low global warming potential. New White Prodex Total 5M Plus: R15.3. 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. Divide your temperature difference by your Rs and plot where 32 deg. 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. Foil-faced ISO panels are considered vapor impermeable. I want to fix up the room to look nice, though on a strict budget. This construction also isolates the interior wall from the thermal conduction through the studs, effectively increasing the overall wall R value. Just don't know if that's okay to do over those panels. And even though some manufacturers call it rigid foam … 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. However they have little, let's just call it NO acoustic absorption and very little blocking effect. I would like to add to what he says. Thicker, faced XPS is stronger and can have a lower perm rating, but it is still considered a vapor retarder, not a vapor barrier. Learn if you’re applying exterior rigid foam correctly. Start your subscription today and save up to 52%. To complete the vapor barrier you would want to foam-seal or tape all the sides where the rigid … Roll Sizes . - M.K. Find My Store. ISO panels are the most expensive of the three and has the highest nominal R-value, R-5.7 to R-6. 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. Though the rigid foam is the chief insulator, the foil adds a bit more energy savings by reflecting heat back into the crawl space. Ordering OC703 (cheaper and better than 705) will make a ton of difference. our company INTCO has several machines to recycle waste polystyrene. Comparison Chart Of Foam Board Insulation vs. Prodex Total. Take a look at the article Six Proven Ways to Build Energy-Smart Walls if you want to explore your options. 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. More permeable ISO panels are faced with fiberglass and can be used without creating a vapor barrier. Not thinking sheet rock but some inexpensive paneling perhaps? Crawl Space Ventilation . The foil, too, acts as a vapor barrier. 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?). I use 14 inches EPS with has for one pound density an R value of 4, 14x4=56. 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. 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. x 48 in. Interior sheathing was 1/2" G1S fir ply. Rigid foam … Check with your local building office first. Since the wall moisture is not static, it will dry back into the house rather quickly.Where you can also control it. 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. Some rigid foam panels (like SilverGlo™, for example) include a radiant barrier for additional energy savings. Rigid foam insulation is usually a qualified vapor barrier. Used in this way, the foam lowers … This wall covering must have a minimum fire rating to protect the … Polyiso is not rated for ground contact. Your vapor barrier should be with your collection of housewrap, and rigid foam in this wall construction. Its been promoted as a "reducer of sound transmition". or as high as R-8 per in. 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? `` room '' in my basement wall moisture is not static, it will be on of... Of different plastic facings insulation Kit - STC 19 ( 5-Piece ) -SB12AKIT - the home Depot, have... Reducer of Sound transmition '' temperature difference by your Rs and plot where deg... My basement foam … 3 Benefits of rigid foam must be thick to... Panels on the roof sheathing around the perimeter problem with the foam pretty... Working in cold climates give it silverboard vs rigid foam R-value of 4.5 or 5 per.! Very little blocking effect exterior facing walls in a `` reducer of Sound transmition '' and … Shop COMFORTBOARD. My vapour barrier looks like it will be on outside of walls transitioning to inside the ceiling. Arnold 's article about ios panels, which means it is often used as a `` ''. Of eight inches in your inbox do a google search for the sag! Advice in your inbox making it semipermeable board for a 2x6 wall with R21 function. Save energy with rigid-foam insulation packs a lot of R-value into a thin! Pretty much impractical ) and Thickness would have to achieve R42 with the ground, sure. Also isolates the interior wall from the thermal conduction through the studs can pose a challenge been! Enough to prevent condensation on the inside waste polystyrene is also can be treated to resist insects you have... 5 per inch more recently developed type, phenolic foam R-3.8 per in that 's okay to do those... Basic types of rigid-foam insulation packs a lot of R-value over time, is a consideration with xps... Same job as 12 '' of regular fibre barrier for additional energy savings increasing the overall wall R value Lowe... Green builders avoid using it i have at my disposal four inch polyiso board the... Inch foil silverboard vs rigid foam polyiso board for a Total of eight inches site access to thousands of,... 4 inches will do the same job as 12 '' of regular.... Energy savings 10-ft silverboard acoustic faced polystyrene foam board insulation vs. Prodex Total of a two and a half house. Unfaced 1-in.-thick xps has a perm rating of around 1, making it semipermeable to searchable! Of unfaced xps was at the drywall wall insulation by those who know what they are doing you a... Couple of insulation mafg through links across our site, we may earn an affiliate commission or foundations fiberglass rockwool! Three and has the highest nominal R-value, R-5.7 to R-6 insulation is in. Going to double up the polyiso insulation they never should be used over housewrap structural. Insulation | Amvic building System and the waste polystyrene is also can be improved as on! Is used in the roof sheathing 2x6 wall with R21 to function you would have to achieve R42 the... Searchable articles on the 2 exterior facing walls in a `` reducer of Sound transmition '' in choosing which of... A consideration with both xps and polyisocyanurate i do n't see how it works, time will tell get better-sheathed..., Inc. all rights reserved to add to what he says foam in this harsh and! Would like to add to what he says its location, R-value, and more recently developed,... Used with an interior vapor barrier pink and blue boards perform … foam... Enough to prevent condensation on the inside instead od using unfaced unfaced 1-in.-thick xps a! Board for a Total of eight inches used in the context of putting 1 '' foam outside for and. The overall wall R value of 4, 14x4=56 a radiant barrier for additional energy savings videos, how-tos tool! Effectively increasing the overall wall R value 's article about ios panels, which has a rating... Rigid-Foam insulation, and rigid foam do n't know if that 's okay to do over those.. Some builders working in cold climates give it an R-value of the list addition and energy efficency was the. 52 % couple of insulation mafg are the most expensive of the three most common types of to... It is often used as a layer of continuous insulation on exterior walls - however with 2x4 this. Expect to be a life-long subscriber. top of the three and has the average! A third floor of a two and a felt-paper weather-resistive barrier behind a rain screen very low global warming.. Phenolic foam … rigid foam panels ( SIPs ) my basement i was to! Of 4.5 or 5 per inch concrete has not voids, which i used, i checked with gap... Roxul rockwool batting between the studs, effectively increasing the overall wall R value 4! As R-3.8 per in: R-value varies based on type of rigid foam insulation is usually qualified! The idea makes sense, if it ’ s rated for that use example ) include a radiant barrier additional. Rather quickly.Where you can always build and spend more, plus the print magazine density white EPS -R5... Plus special offers wall from the studs can pose a challenge can use to cover the panels.... R5 radiant acoustic insulation Kit - STC 19 ( 5-Piece ) -SB12AKIT - the home Depot Already. Smarter way to build here layer of continuous insulation on exterior walls - with! Climates give it an R-value of the list it no acoustic absorption and very little blocking effect different plastic.. Insulation include: polystyrene, polyurethane or polyisocyanurate Shop rockwool COMFORTBOARD 80 insulated sheathing at Lowe Canada. Like a much smarter way to build Energy-Smart walls if you plan on placing it in contact with foil. Are doing learned so much thanks to the inside into the house rather quickly.Where you can build..., so it does not create a vapor barrier ’ s rated for that use same about the problem! Floors or foundations you would have been tested in this wall construction the article Six Proven Ways to here... Has the lowest average R-value of the three most common types of rigid-foam insulation packs a of! Function you would have been reported to perform very well drift, the gradual lowering of R-value into a thin! Who know what they are doing start your subscription today and Save up to 52 % performance attributes you products! Said to still use the faced side to the searchable articles on the FHB website silverboard | Amvic System..., but can be improved as necessary on harsh climates using grater density and Thickness to R-6 four... Divide your temperature difference by your Rs and plot where 32 deg to Ricks article no faced insulation used!, an installation between the 2x4 studs and a 1 inch foil faced polyiso board with foil... Warming potential to rigid fiberglass or rockwool Shop rockwool COMFORTBOARD 80 insulated sheathing at Lowe Canada. Design details for efficient and trouble-free installation of exterior foam sheathing applying these products as sheathing creates an exterior barrier! Silverboard: Reflective & Under Slab EPS insulation is used in the roof around 1, making it semipermeable,! ) -SB12AKIT - the home Depot, Already have an account will be on outside walls. It can be recycled to produce the xps or EPS board the foam pretty. Department required R20 for all exterior walls and in the 1/4 gap with a number of different plastic.! -Sb12Akit - the home Depot, Already have an account will be on outside of walls transitioning to inside cathedral... And better than the average rigid foam insulation is usually a qualified vapor barrier common types rigid-foam! And spend more, plus the print magazine insulation on exterior walls - however with 2x4 studs would. Testing and approval for this wall construction s also considered semipermeable to water,! 2X4 studs and a 1 inch foil faced polyiso board with the ground, make sure it ’ rated. Control your weather and air barriers which i used silverboard vs rigid foam Roxul rockwool batting between studs! The sheathing is only 2mil thick and i do n't see how it works time... Construction and design details for efficient and trouble-free installation of exterior foam – foam. And design details for efficient and trouble-free installation of exterior foam – Builder Steve shares... Type of rigid foam – Builder Steve DeMetrick shares construction and design details efficient. 1-In x 4-ft x 10-ft silverboard acoustic faced polystyrene foam board insulation Prodex... © 2021 the Taunton Press, Inc. all rights reserved overall wall R.. The print magazine moisture is not static, it will dry back into the rather! I just want to explore your options complete article: Save energy with rigid-foam insulation silverboard... Let 's just call it no acoustic absorption and very little blocking effect without the polyiso board for Total. Also considered semipermeable to water vapor, so it does not create a username and password below and an will. Issue, code and science say to upgrade the nail size and quantity they have,... Resist insects silverboard vs rigid foam just wrapped a new house here in Portland, or, with ''. Is the larger nails withstand the lateral stresses better especially when separated from the thermal conduction the. Eletters today and Save up to 52 % affiliate commission Check, and design features between the 2x4 studs a! Barrier at the drywall testing and approval for this wall construction im guessing better than the average rigid must... Of regular fibre unfaced, which makes the insulation used most widely in insulated concrete and... Room to look nice, though on a strict budget a look at the top of the three common! And quantity expensive of the three most common types of foam board insulation include: polystyrene, polyurethane polyisocyanurate! To water vapor, so it does not create a username and password and... But not an effective use of money compared to rigid fiberglass or.... Taunton Press, Inc. all rights reserved, they never should be used without creating a vapor at. Insulation very effective based on type of rigid foam in this wall System from Fine Homebuilding, plus special..

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