01:33PM | 06/28/03
Member Since: 06/27/03
3 lifetime posts
I have a 4 ft high crawl space about 20 ft long by 13 ft high with a concrete cap. I'd like to replace the exposed, unfaced fiberglass insulation with Premier Industries R-Tech silver-faced polystyrene boards.

My question is what thickness is appropriate for this use? The available thicknesses vary from 1/2 inch to 3 inches. Also, what is the best adhesive to use to attach the boards to the (cleaned!) block walls?

I live in Columbus, Ohio, if that's important to know.



07:07PM | 06/29/03
Member Since: 01/28/03
693 lifetime posts
There is no reason to add insulation to your block walls in a concrete crawlspace in Ohio...foam or otherwise.

Any insulation in a crawlspace for your climate should be placed into the floor joists of the story above the crawl space and should be generally R-25 or better compact fiberglass.


07:31PM | 06/29/03
Member Since: 06/27/03
3 lifetime posts
Thanks for the response. I thought the same as you, but my local building code office requires that the crawlspace and first 2/3 of walls be insulated, below the frostline. The house is new, so the exterior foundation has been waterproofed and insulated as well. I think it's overkill, but to get permit approval, I have to insulate.

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