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Old 09-30-2008, 10:47 PM   #1
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polystyrene under basement pad


I am building a wood basement with a concrete floor and am wondering about insulating under it. I have a concrete footing with tamped gravel under the floor. My plan is to lay poly over the gravel and then 1" extruded polystyrene and then 3 inches of concrete. Are there any concerns I should have as far as condensation happening on top of the insulation and wrecking the concrete?

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Old 10-01-2008, 06:54 AM   #2
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polystyrene under basement pad


i wouldn't bother as ambient earth temp's about 65f,,, insulation only affects the transfer rate of heat to cold. poly & 4"'d be my choice.

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Old 10-01-2008, 08:04 PM   #3
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polystyrene under basement pad


I never mentioned that its a walkout so the front of the basement floor should be a lot colder than the back. Frost level here is about 8 feet and can get very cold.
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Old 10-02-2008, 05:05 AM   #4
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polystyrene under basement pad


sandbagger !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

frost protection makes lotsa sense, then,,, on the footer's face & up the backside.

now, anything else you'd like to throw into the pot ? ? ?
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Old 10-02-2008, 01:15 PM   #5
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polystyrene under basement pad


Yeah, I have some questions about sheeting and insulation but I'll put it in the construction forum. Thanks for the advice. And just to be clear, if I lay poly over top of the gravel and then put 1" polystyrene and then the concrete there won't be a condensation problem?
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Old 10-02-2008, 02:16 PM   #6
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polystyrene under basement pad


I'd put the vapor barrier on the "warm" side of the insulation. That would be right under the concrete. I doubt you'll have any trouble either way though.
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Old 10-02-2008, 04:16 PM   #7
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polystyrene under basement pad


My basement has (top down) 4" concrete, radiant heat, 2.5" Owens Corning Formular 250, and I don't recall the thickness..but plastic. It's the driest basement I've ever had...and no, there's no condensation that I'm aware of.

On a side note...not all foam is rated for under slab installation, make sure to use the right product.

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