![]() In closing, I don't have an answer for you, I'm literally not smart enough, or well educated on the subject. However, five hundred miles north, on the New England coast, with a building a century older, it may very well destroy the exterior in a few years, by compromising the ability of the exterior wall to full dry between rains, or snow, and leave saturated bricks to freeze and decompose. it would probably work fine given the specific details of my project, including location and condition of the structure. ![]() The reasons are complex, and basically boil down to. The fascinating part of the whole concept is that doing this type of retrofit to an existing brick building can, and has, destroyed many beautiful old brick structures. Second, after destroying and rebuilding the interior of this home, my payback would probably work out to forty or fifty years, if ever. First, the savings are nearly negligible, and can be offset with things like a smart thermostat, and savvy buying of heating oil. I about fell out of my chair when I read that figure, for two reasons. Second, the end result, according to a white paper from the DOE, is that I can look forward to a 9% reduction in heating costs. First, the interior of the home needs to be destroyed and rebuilt to accomplish this task. Attach 2" of extruded poly to the walls, and stud frame the interior. Second choice, at a much lower cost, is to demo. While doing a lot of the same research the OP is doing, I found that best practice is to gut the interior, build stud walls an inch inside of the block, and spray at least R-10 closed cell foam on the block wall. you might say, "what's the issue?" but this place is located 1000 miles north of there, on the east coast. The place is built of block, with a brick exterior and furring strips and plasterboard nailed to the interior. Unfortunately, in the 1950s, there was no need to worry about heating costs, since oil was dirt cheap, so the place not only has no insulation in the walls, and no hope of putting any in. It is the first old home we ever bought, and in many ways it's an amazing place. Oddly enough, the same techniques and material have been highly successful in other applications, other homes, other locations.Ĭurrently, for the first time in my life, I'm doing battle with a sweet mid-century ranch we just bought. This is an logical as curing a lung infection with a nice new sweater. Sadly, the "cure" for this is often to hide the ongoing failure under vinyl siding. ![]() They have also created conditions where wonderful old buildings no longer can keep a coat of paint on them, since the vapor dynamics have been altered, and wall cavity moisture in now migrating through the paint, and rotting the siding underneath. The same products and techniques have caused mold growth and moisture damage in the walls of wood frame buildings to the point that demolition revealed severe cavity rot, mold and trapped moisture, rendering the building uninhabitable. Doing so by creating conditions where brick exteriors spalled, cracked and eroded to the point that hundreds of years of wear occurred in the few years. Incorrectly placed vapor barriers, spray foam, and/or high density cellulose installations have all successfully destroyed buildings. Comments like, "well that didn't work as well as we hoped, so try this", or " this method is now generally accepted as a disaster in climate zones 5-8, but can preform well in southern zones" are common. As a result the true experts in the building sciences field, like all good scientists, are constantly reviewing and challenging their ideas of best practice. The materials and methods you choose can be wildly successful, or literally destroy the building. As you are probably aware, your question is highly complex, and the variables are numerous, including everything from your location, to the smallest of original construction details. Honestly, no offense to anybody here, but I wouldn't ask a question like this on anything but a building sciences forum, then I would simply ignore anybody who I couldn't vet as an expert, in the responses.
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