Installing Rigid Foam Sheathing. To boost the R-value of the walls, 4 inches of polyisocyanurate foam is being added to the walls and roof. It may look easy to go buy some packs of rigid insulation panels down at the local hardware store and screw them to your walls, but unless you understand how your existing walls are built and how they "work" in terms of keeping moisture, heat and cold where they should be for durability, the insulation panels might not be the only things you're screwing up! In hindsight it is unlikely we would ever repeat that process, but that’s how we learn! Before you can install these panels, you’ll have to do some demolition. For that reason if you wanted a simple "one size fits all" exterior insulation skin option but don't want or aren't able to add 7" to the exterior of your home, we would recommend Rockwool rigid board insulation (known as Roxul prior to re-branding). If you purchase foam insulation that is too thick it may pose a problem by pushing the wall system too far out from the existing windows and trim. Gabion walls are retaining wa…, Approximately 100 times more water vapour is carried into our walls by air leakage than is carried by vapour diffusion. He’s going to gut the room, but doesn’t plan to remove any exterior siding.His goal is to boost the R-value, and improve the air-sealing, in exterior walls by adding a layer of rigid foam insulation on the inside, after filling the walls with cellulose. When properly constructed, it provides a tight, dry, warm, and durable structure. Below are a few methods for improving an older home's insulation levels and attaching exterior wall insulation successfully. We realize that the mere mention of any kind of "Styrofoam" or foam insulation (ThermalWall PH is made with EPS / Expanded polystyrene) can upset the sensibilities of hard-core environmentalists, but it is worth keeping in mind that EPS insulation panels are mostly made of air, it is recyclable, the plastic content is a petroleum byproduct rather than primary material and it could be plant-based if it weren't for cost and the carbon footprint of doing so, and it works well when you use it for the right applications. Adding foam insulation to your existing walls creates an air seal that can take care of those cold spots and annoying drafts. We need to insulated because of the rising electric costs becaus of the summer heat. Better yet, remove it completely. Moisture will forever wick up from the ground to keep the concrete wet. Add flat rigid insulation to the wall before the siding is installed ; Install insulated vinyl siding . Do I still need to use a weather-resistive barrier? Remove all the trim from the exterior walls—window and door casings, baseboards, crown molding, you name it—and rip the drywall and studs off the block walls. But to speak to the products you mention - Rockwool isn’t the cheapest, it also isn’t the highest R value, but it’s a workhorse of an insulation product that can safely be applied to most exterior walls for the main reason that moisture moves right through it, so you won’t accidentally be trapping moisture inside walls. x 3 in.) At that point what you are doing is building a R.E.M.O.T.E wall, read more about that here. You can add batt insulation, dense pack cellulose, rigid insulation panels or spray foam if you choose (spray foam is our least favorite but it can be done so we mention it, though we always encourage readers to choose spray foam with the safest blowing agents). Rigid foam insulation is available in different thicknesses. Use 2×2-inch lumber for the studs and 2×3-inch lumber for the top and bottom plates. It’s not perfect and it does reduce the overall performance of the wall, but it’s not the end of the world, so don’t panic if you’ve already done it or are planning on doing it, we’re just trying to outline best practices. The lower level has 2 in of XPS rigid foam insulation on the interior walls. Conclusion: I blame the wall insulation for the air leakage. My question is this: can I reasonably screw-and-glue the rigid panels right over the existing stucco cladding, or should I really remove all the prior layers of stucco first and attach the foam directly to the wall sheathing? Installing rigid foam on the outside of a house is a great way to double the R-value and eliminate air leaks. We install the foam over a layer of house wrap using cap nails followed by taping all … Definitely a step we didn't anticipate, but all said and done it wasn't too time consuming, it may have added 2 hours or so of time to the whole place. 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