i am fixing up a 135 year old house and need to insulate. the house has wood siding no vapor barrier, felt paper etc underneath siding. i ususally blow in celluose but am concerned that any mositure that gets into wall cavity, wont be able to dry out with the added insulation? have plaster wall’s that are salvageable, if have to can gut interior, hoping not to. any experience with this would be appreciated. thank jpetrich
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Where the house is affects the need or lack of need for a vapor barrier. So, where is it?
Andy
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Don't need the adress, but the climatic region would be helpfull.
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PIFFIN, HOUSE LOCATED IN CHARLESTON, SC THANKS FOR YOU HELP, JP
that is one of the miost humid climates to build in in this country. You are right to be concerned.
Since you don't realy need the insulation for heat there, I assume it is to save on air conditioning costs, and that this might be a historical classic, right?
to insulate in a cooling climate like that, you want the VB on the exterior face of the wall, not the interior. Placing tarpaper over the sheathing is also important for keeping wind driven rain out of the wall assembly.
Are you retrimming the whole exterior anyway? Reason I asked about the classic style is that you might have detaling you want to keep. Otherwise, I might suggest adding 1/2" Thermax foam insulation over the sheathing
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ANDY, HOUSE LOCATED IN CHARLESTON, SC THANKS FOR YOU SUGGESTI0NS
Moisture drive is from warm to cold and from wet to dry. So if you're mainly air conditioning, the moisture from outside is going to want to come in. Piffin's right, VB on the outside. That said, cellulose can store a lot of moisture before becoming saturated, which is when problems really start. AC might take care of it, as long as the system is sized correctly, not too big, and you don't have other big moisture sources such as a dirt crawlspace.
AndyArguing with a Breaktimer is like mud-wrestling a pig -- Sooner or later you find out the pig loves it.
Other people can talk about how to expand the destiny of mankind. I just want to talk about how to fix a motorcycle. I think that what I have to say has more lasting value. --Robert M. Pirsig