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#1
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need advice: how to insulate below floor on addition
Hello All,
I bought a home that has an addition which is built on concrete pillars, much like a deck would be. The builder put fiberglass insulation between the floor joists, and it just fell out onto the ground (brilliant, eh?). The room is cold in winter and hot in summer, and I need advice on how to better insulate the floor. I was planning on putting new fiberglass insulation between the joists, then covering it with foam sheet insulation. I don't know if this will make it any better or worse, but I am at a loss as to what to do here. Any comments, advice appreciated. -KJ |
#2
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The foam sheet needs to be covered since it is flamable.
wrote in message oups.com... Hello All, I bought a home that has an addition which is built on concrete pillars, much like a deck would be. The builder put fiberglass insulation between the floor joists, and it just fell out onto the ground (brilliant, eh?). The room is cold in winter and hot in summer, and I need advice on how to better insulate the floor. I was planning on putting new fiberglass insulation between the joists, then covering it with foam sheet insulation. I don't know if this will make it any better or worse, but I am at a loss as to what to do here. Any comments, advice appreciated. -KJ |
#3
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#5
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I would replace the insulation, then staple plastic over it and then
use treated plywood to cover over that. I would worry about insects and rodents if it is not "sealed" (but I also do not know how it is protected from the outside). |
#6
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Roy Starrin wrote:
wrote: I bought a home that has an addition which is built on concrete pillars, much like a deck would be. The builder put fiberglass insulation between the floor joists, and it just fell out onto the ground (brilliant, eh?). As discussed, chicken wire will work... So would foil, for downward heatflow, eg thin double-foil foamboard with no other insulation. Nick |
#7
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So just nail foamboarn to the (ground-facing) edge of the joists - or
to the underside of the floor? |
#8
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wrote:
So just nail foamboarn to the (ground-facing) edge of the joists - or to the underside of the floor? Sure. Warm air rises, so we only need to reduce heat loss by radiation. Nick |
#9
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Where do you live , what Zone, what are winter temp lows. This will
determine what you need to do. |
#10
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Upstate NY. Winter temp lows here hit about -13F
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