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Insulating floor joists? patrick 09-17-2006
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Posted by patrick on September 17, 2006, 9:26 am
I have a room that is over a crawl space. The room has hardwoord
floors.
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.

thanks.


Posted by Edwin Pawlowski on September 17, 2006, 9:43 am

>I have a room that is over a crawl space. The room has hardwoord
> floors.
> 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.

Absolutely it would. You can use foam board, you can spray, you can use
fiberglass.



Posted by patrick on September 17, 2006, 10:06 am
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
it myself.

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:
> >I have a room that is over a crawl space. The room has hardwoord
> > floors.
> > 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.
>
> Absolutely it would. You can use foam board, you can spray, you can use
> fiberglass.


Posted by RicodJour on September 17, 2006, 11:17 am
patrick wrote:
> 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
> it myself.

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.

> Which is then more effective--the foam board or fiberglass?

Rigid insulation has roughly twice the R-value of fiberglass batt
insulation.

> I don't understand the comment about making the basement colder, this
> is above a closed off crawl space.

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.

R


Posted by Buck Turgidson on September 17, 2006, 12:35 pm
Does the fact that he has HW floors make a difference in foam insulation,
i.e. is it a fire code violation since there is no fire-resistant covering
over the foam? Or does that apply just to walls?



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