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Old 08-14-2007, 08:00 PM   #1
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insulation b/ween concrete and gravel in live-in basement


i live in washington, dc (moderate climate).

someone told me that applying elaborate insulation may be an overkill but that i should still spread some nylon coverings right underneath concrete.

any advice ?

thanks,

- a

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Old 08-14-2007, 08:15 PM   #2
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insulation b/ween concrete and gravel in live-in basement


There ain't nothing elaborate about high heating bills. And DC DOES get cold in the winter. Is this a new concrete pour? If so I'd be putting 2" of Styrofoam under it.
  • Gravel
  • 6 mil poly vapor barrier
  • Styrofoam
  • re-mesh or rebar
  • concrete
In that order.


Last edited by SecretSquirrel; 08-14-2007 at 08:20 PM. Reason: spelling
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Old 08-15-2007, 07:01 AM   #3
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insulation b/ween concrete and gravel in live-in basement


thanks. could you tell me exactly which type of vapor barrier and styrofoam to use as i don't get much help at home depot ?

thanks.

- a
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Old 08-15-2007, 08:14 AM   #4
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insulation b/ween concrete and gravel in live-in basement


In NYwhen I insulated my crawl space I used 2" polyisocyanurate foam board. I called the manufacturer and they said to use a vapor barrier(6 mil plastic) on both sides of the board. This was a foil faced board. I also used it to line the interior poured concrete walls. The space stays about 10 degrees warmer then the outside temperatures in winter.
Secret Squirrel, any reason for the styrofoam board over the other alternatives?
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Old 08-15-2007, 09:03 AM   #5
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insulation b/ween concrete and gravel in live-in basement


I insulated my basement real tight... still find it very cold late at night in a hot summer day.... couldn't sleep there...it is interesting... upstair is too hot... basement is too cold.... winter may be better as it has heat....
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Old 08-15-2007, 12:00 PM   #6
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insulation b/ween concrete and gravel in live-in basement


Quote:
Originally Posted by Ron6519 View Post
Secret Squirrel, any reason for the styrofoam board over the other alternatives?
Ron
Nothing other than the product is made specific to this application, good compression strength, code compliant, good R value, is moisture resistant, and readily available. It is usually the product of choice when installing in-slab radiant heat.

See: http://www.dow.com/styrofoam/na/res-...under_slab.htm

Addendum: Ron, I think one of the other factors that limited my choice to styrofoam was the Polyiso was never suggested as an underslab product up on the Dow web site. This doesn't necessarily imply that it (Polyiso) is not suitable for that specific purpose. Dow only offers it in thicknesses up to 1".

See: http://www.dow.com/styrofoam/na/res-...cts/tuff_r.htm

Last edited by SecretSquirrel; 08-15-2007 at 12:34 PM. Reason: Addendum
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Old 08-15-2007, 12:02 PM   #7
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insulation b/ween concrete and gravel in live-in basement


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Originally Posted by KUI****G View Post
I insulated my basement real tight... still find it very cold late at night in a hot summer day.... couldn't sleep there...it is interesting... upstair is too hot... basement is too cold.... winter may be better as it has heat....
Cold air settles and hot air rises. I have the same problem in my split level... cold at the underground level but swampy upstairs.

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