I have a room that is over a crawl space. The room has hardwoord
Last year I had the permiter of the crawl, and the block walls stripped
of the old
wet pink insulation, and sprayed with the yellow foam. This definately
helped with the temperature of the room, and the coldness of the floor.
Would it be beneficial to also insulate (maybe with the pink stuff)
the floor joists under the floor? I live in the midwest--10 to 30
degrees most of the winter.
How does foam board attach? I assume that is the blue colored board?
I would think the foam might be the most effective, but I can't install
Which is then more effective--the foam board or fiberglass?
I don't understand the comment about making the basement colder, this
is above a closed off crawl space.
Edwin Pawlowski wrote:
The foam board can be attached almost any way you can think of - nails,
screws, adhesives. You can cut the board to make a wedge fit between
the joists and use a can of expanding foam to seal the gaps.
Rigid insulation has roughly twice the R-value of fiberglass batt
The heat coming from the room above the crawlspace won't supply enough
heat to heat the basement to any measurable degree. It's not a factor.
My understanding is that the building code specifies that a thermal
barrier is required between the foam and the living space, and that
1/2" of gypsum board is a thermal barrier, but that it doesn't
enumerate all possible thermal barriers. So some jurisdictions accept
alternate thermal barriers, e.g. 5/8" of wood, in which case the
subfloor and HW floor would presumably be sufficient.
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