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Insulating floor joists? patrick 09-17-2006
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Posted by RicodJour on September 17, 2006, 12:48 pm
Buck Turgidson wrote:
> 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?

The fire resistive barrier must be on the occupied side of the foam so
it is acceptable to have rigid foam insulation in the crawl space.

R


Radiant Heat 468x60
Posted by Wayne Whitney on September 17, 2006, 10:35 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?

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.

Cheers, Wayne


Posted by Edwin Pawlowski on September 17, 2006, 10:57 pm

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

The person answering that did not read the message fully. It won't have an
effect at all.



Posted by Curmudgeon on September 17, 2006, 10:11 am
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.
>
>
In most areas, floor insulation (between the floor joists) is required
by code...I'm amazed that in the midwest this wasn't done. You'll save
a BUNCH!

Posted by patrick on September 17, 2006, 10:47 am
House was built in '23......so no surprise to me.



Curmudgeon wrote:
> 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.
> >
> >
> In most areas, floor insulation (between the floor joists) is required
> by code...I'm amazed that in the midwest this wasn't done. You'll save
> a BUNCH!


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