Foil-faced ISO panels are considered vapor impermeable. 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. Because ISO starts as liquid foam and has to be sprayed against a substrate to form a rigid panel, all ISO panels are faced. 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. The science I read suggests that this is close to optimal construction for our marine climate. 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. The basic types of foam board insulation include: polystyrene, polyurethane or polyisocyanurate. Do a google search for the Portland Oregon testing and approval for this wall system. ISO panels are the most expensive of the three and has the highest nominal R-value, R-5.7 to R-6. An Irish manufacturer offers a fourth and more recently developed type, phenolic foam. I hope this is the right place to ask this question. EPS insulation is used in the construction of buildings to insulate roofs, walls, floors or foundations. I have a question. When applied as sheathing, EPS should be used over housewrap. SilveRboard Rigid Foam Insulation (EPS) offers builders a higher performance product which increases job-site efficiency and reduces labor costs. 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. 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. 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. I use 14 inches EPS with has for one pound density an R value of 4, 14x4=56. Some builders working in cold climates give it an R-value of 4.5 or 5 per inch. I have at my disposal four inch polyiso board with the foil facing. EPS is suitable for ground contact and can be treated to resist insects. Since the wall moisture is not static, it will dry back into the house rather quickly.Where you can also control it. 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. The REMOTE walls have been tested in this harsh environment and have been reported to perform very well. Is Your Exterior Rigid Foam Too Thin? Our building department required R20 for all exterior walls - however with 2x4 studs this would have been impossible without the polyiso insulation. 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. What i wound up also using was that breathable vapor barrier that Certinteed sells. the NCR is 0.19. any thoughts? 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. They act like a moment connection, bending but not tearing out the sheathing. SilveRboard 24 in. 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