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Underfloor Insulation

 
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Old 05-18-2008, 02:17 PM   #1
 
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Underfloor Insulation


I am adding on to our house (17 x 34 two story) and have a poured stem wall and floor joists. I have glued 2" Styrofoam insulation around interior of stem wall. My question is would it be cost effective to put fiberglass bats between the floor joists or not?

Also, I was planning to use fiberglass bats in the walls (2 x 6) or should I do a combination of Styrofoam and fiberglass to increase R values?

We live in Northeast Oklahoma and the temps can be anywhere from 5 to 100 degrees.

Thanks
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Old 05-18-2008, 02:34 PM   #2
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Re: Underfloor Insulation


You want to insulate the rim joist,
and joist pockets on the perimeter.
Just treat the crawl as a conditioned space.
If you have HVAC and plumbing down there
you want it to be part of the house,
so that the plumbing doesn't freeze or
sweat in the summer.
If the perimeter is insulated any heat loss
you have is into the house.

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Old 05-18-2008, 02:35 PM   #3
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Re: Underfloor Insulation


Your code will dictate the underfloor insulation...if not I would recommend it, prior to subfloor install the netting to the underside of the joists, install the batts then apply the subfloor. You will find it easier to work from the top as opposed to shimmying around in a crawl space to do it later.

As for the walls one of the better ways to do the job is to use a expanded polystyrene on the exterior either on top of the sheeting or in lieu of with windbraces (again local code will dictate, along with the exterior finish you are planning) The batts are put in after all rough ins as usual or depending on your budget use spray foam insulation for better results.

Find Joasis on here, he is from Oklahoma and I believe he does insulation as well
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Old 05-18-2008, 02:52 PM   #4
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Re: Underfloor Insulation


Quote:
Originally Posted by Chris Johnson View Post
Your code will dictate the underfloor insulation...if not I would recommend it, prior to subfloor install the netting to the underside of the joists, install the batts then apply the subfloor. You will find it easier to work from the top as opposed to shimmying around in a crawl space to do it later.

As for the walls one of the better ways to do the job is to use a expanded polystyrene on the exterior either on top of the sheeting or in lieu of with windbraces (again local code will dictate, along with the exterior finish you are planning) The batts are put in after all rough ins as usual or depending on your budget use spray foam insulation for better results.

Find Joasis on here, he is from Oklahoma and I believe he does insulation as well
You guys out there don't understand
weather.
Back here, if you leave plumbing outside
the envelope, it freezes.
You know, kind like the ice cubes in the
fridge.
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Old 05-18-2008, 03:20 PM   #5
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Re: Underfloor Insulation


Quote:
Originally Posted by neolitic View Post
You guys out there don't understand
weather.

I understand weather...I can wear a t-shirt out the door 350 days a year and then the other 15 I need a light jacket
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Old 05-18-2008, 03:32 PM   #6
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Re: Underfloor Insulation


Quote:
Originally Posted by Chris Johnson View Post
I understand weather...I can wear a t-shirt out the door 350 days a year and then the other 15 I need a light jacket
I remember that, when I lived in the
East Bay.
When I live on 46th St. in SF is when
I learned why sailors wore P-coats.
Folks back here would laugh when I said
it was cold down at the beach(40's) and
they were looking at -5 here.
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Old 05-18-2008, 04:59 PM   #7
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Re: Underfloor Insulation


Insulation, like blue board or Styrofoam go to the outside of the stem, not the inside....the stem will conduct the cold right to the perimeter walls, such as it is. Code usually dictates insulating the footing, and that is all, simply because the soil temps in the ground (protected under the house) are stable at 60 degrees or so, providing you are not venting the underside excessively. In the application you are describing, there is no point in underfloor insulation....a vapor barrier will do as much good.

And Chris...did you say something about a job? Tee-shirts 350 days a year? If the taxes are low, I am packing tonight!
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Old 05-18-2008, 05:02 PM   #8
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Re: Underfloor Insulation


Just the property tax hurts...It's the tax for the nice weather, all the bikini's you want to view!!!
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Old 05-18-2008, 10:20 PM   #9
 
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Re: Underfloor Insulation


Thanks for all the posts!

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