Quote:
Originally Posted by Phantom
I have a few questions on doing this in regards to running electric, if the wall is filled with spray foam and a new outlets or switch in needed to be ran (adding a ceiling fan) will the dry wall need to be removed again and have the foam cut out making sure not to hit wires that are there?
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I think you are correct.
Quote:
Originally Posted by Phantom
How effective would this be if only a 1/4 or 1/2 inch is added then replace the fiberglass and replace the drywall?
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This is effective as a sealing layer.
In my case I had 3.5 inches of fiberglass that I removed. I then sprayed 2 - 4 inches of foam (to both seal and insulate), added to the thickness of the wall with more framing (to allow more total insulation), and blew in 2-3 inches of cellulose. This layer of cellulose will be easy to add wires through and should insulate better than the original fiberglass.
Next time I use the spray foam I plan to only use a 2 inch layer as the thicker I sprayed the more uneven the results and the harder it was to get a good fill of cellulose.