My buddy is getting ready to build a new house in Michigan and has to have the basement walls insulated to R10. He doesnt want to insulate the outside due to having to cover the insulation at grade and with his walk out etc it might not work out the way he wants. He also doesnt want to insulate the inside with sheet as he does not want to finish the basement at time of construction so he does not get with the additional taxable sg/ft snd he is not too keen on the wall &#;blanket&#; type insulation either..
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He was talking to the local inspector who told him about a newer product that is a sheet but does NOT have to be drywalled over for fire protection. The inspector couldnt remember the name of it and we are coming up blank on Google etc searchs.
Does this sound familar to anyone out there? Any info/experience with it? Good/Bad/Indifferent??
Thanks guys
J-
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A client&#;s deep energy retrofit got started but stopped about 16 months ago, right after the foil-faced polyiso was installed but before the siding was installed. All polyiso joints and almost all edges were taped and sealed. The tape looks great (pretty amazing after two very hard zone 5 winters).
So what to do about the polyiso? The R-Value has decreased, but by how much? Has the overall durability of the product been compromised? The Dow techline says that exposure up to 45 days is ok, but then the R-Value will change due to water and sun. Depending on location on the house, the reduction will vary. No idea if it will be decreased by 10% or 75%. This is what I am trying to determine.
I see the options as follows:
1. Remove and replace all polyiso ($$$, but clearly the bullet-proof solution)
2. Keep existing, if can determine if r-value of existing install is acceptable (even if compromised) by testing or rule of thumb. Can this be determined without testing samples?
Anything else to be considered? Thanks.
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