Insulating a void in basement.
I was wondering if the experts here could help me with an insulation question.
I have a fireplace in the basement that we do not ever use. It is a slight bumpout from the house. There is a bathroom just above it on the first floor (the chimney angles up to the left and does not interfere with the bathroom). As a result, there is a void above and behind the fireplace and below the 1st floor bathroom (roughly 40 inches to the foundation wall).
The bathroom is always cold--many degrees below the rest of the house. From what I can tell, there is insulation behind the drywall of the mantlepiece and basement wall above it but the void above/behind the fireplace and directly below the 1st floor bathroom does not seem to have any insulation. Said differently, the void is outside the thermal envelope.
I've had a few insulation installers come out. A few of them have suggested blowing in mineral wool to densely pack the void and use open cell foam along the foundation wall and top-plate.
A few questions:
1) I have never heard of mineral wool before. Is it safe? Any off-gassing or airborne fibre issues?
2). What would be other alternatives I could use? Could blown in cellulose also be used to densely pack the void?
3) Aside from Icenyne open cell foam what else could be used? I am wary of the issues people have had with these products.
Posted Mon, 02/18/2013 - 20:58
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