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andrelaplume2

Can I use XPS here...

andrelaplume2
12 years ago

Insulating Rim joists in the final section of my basemet. Using 2" foamboard with drywall in front of it. I am to a point where my upstairs fireplace is above. I pulled out the insulation I put in loosely 5 years ago...immediate draft. When I look up I see what appears to be 6' of cinder blocks..cant tell the depth. I assume this is in someway the base of the fireplace above. I have no idea if this is typical for fireplaces but want to know:

1) if the fg insulation in there is / was safe having there.

2) If I should cut a 18" x 72" piece of 2" foamboard and put it in there then cover with a piece of drywall.

My concern is the heat from the fireplace above...do the cinderblocks heat up etc....

Thoughts....

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