I am redoing the wiring in my house by fishing it through the walls and
attic making small cuts where needed to pull it through. The outer
walls have foam insulation and some of it has crumbled to dust while
working and some of it has been cut out and saved. What is the best way
to repair the insulation without ripping out the drywall? I have
thought about putting the cut out stuff back and using canned spray
foam do do the rest. Will this work?
It wil work so long as you don't have too much area to fill. The
canned foam is too expensive to use in a larger area. If the area is
larger you might consider blowing in cellulose. The material is cheap
and the blower can be rented. You only need a hole at the top of the
wall cavity to insert a blower hose.
How old is this spray foam insulation? It seems troubling to describe
it as "crumbled". I understand that the older formulations are more
toxic and less satisfactory than newer ones, but in any case spray foam
should be good stuff because it's both fire resistant and mold proof.
Check out Tigerfoam.com and see what they say. You can purchase more
foam and put it in yourself, at a cheaper price than the canned foam
sold at Home Depot.
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