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Old 01-26-2004, 07:49 PM   #15
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Insulation

Doug:
Shame on you! Tell us how neat it is (isocyan' w/foil) and don't tell us where to get it or what it cost.
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Old 01-26-2004, 08:35 PM   #16
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Don't use expanded polystyrene

Aaron,

Expanded polystyrene (compressed polystyrene beads) will hold water between the beads. Extruded will not absorb water. Also, I know for a fact that critters will attack polystyrene in any form. I have extruded closed cell polystyrene enveloping my entire house protected on the interior side with 2" T&G pine boards. At night I can hear the mice in the insulation. Luckily they've never penetrated the pine and gotten into the house. BTW, if the boards are white they are expanded polystyrene. If the boards are blue (Dow), pink (Owens Corning) or yellow (Certifoam) they are extruded closed cell polystyrene.

Doug's idea of using polyisocyanurate boards with an aluminum foil vapor barrier is commonly used in commercial roof insulation. They can, by code, be applied directly over a metal roof deck without a fire barrier. Polystyrenes require a gypsum board fire barrier. The foil faced type of boards can be used inside a building with the foil on the warm side. Polyisocyanurates are very similar to polyurethanes, are closed cell non water absorbing--and safer than polystyrene.
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Old 01-26-2004, 08:47 PM   #17
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Did I mention I'm a distributor? (just kidding) I found polyisocyanurate insulation in several sizes at our local small town home center/ lumber yard. I've seen it at the big box stores, too. Some of the sales folks have never heard of it, even though they carry it. I think the problem is that none of us know how to pronounce it. You may have to do some explaining for folks to know what you're talking about. I can't remember what I paid - didn't think it was too expensive, maybe $10 or $15/ 4'x8' sheet.
Doug
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Old 01-26-2004, 08:58 PM   #18
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Polly I so sigh an your ate

I think that is phonetically close.
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Old 01-26-2004, 09:02 PM   #19
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One of the trade names is Thermax, made by Dow; I have seen it at HD and Lowes. I also used under my floor and really like the way it went in and it doesn't hold water.

John
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