how to fill void in wall after removing direct-vent fireplace, how to insulate, is foam insulation OK?

Question

i removed a direct-vent fireplace from our family room and have to remove the venting and fill the hole in the wall. What type of insulation should I use behind the drywall? Is it OK to just use expanding foam insulation for the hole? I currently have fibreglass batt insulation in the wall

Answer 1

you don't need to check with the city for just filling a hole in your wall.

you can use any type of insulation you like. i think it depends on the size of the hole, because if it is relatively small, then yes, you could use the expanding foam thing that comes in the can, but if the hole is larger, then you may just want to use any kind of fiberglass insulation that rolls out.

Answer 2

If you are going to go so far as removing the wall material on your side, consider leaving it and adding a new wall just inside and insulating this. It can be as little as 4 " thick if wood framing is used, smaller if steel studs are used. The trick is it must NOT touch the existing wall, or the sound will transfer through the studs. This is your best bet as far as sound control, and staggered studs or two separate wall systems are standard fare in upper quality apartment and condo construction.

Answer 3

use regular fiberglass insulation to fill space then cut dry wall to fit hole fasten in place the Spackle sand and paint

Answer 4

Did you seal the chimney at the top for rain, first?

Answer 5

use the same type you are removing fibre glass
fire regulations come into play here

Answer 6

Check with your city building inspector, as you just can't use any thing, there are building codes & requirements.