Keeping a crawlspace vented--insulation options?
I live in a 100 year old barn that was converted to a single family in 1971. It has a field stone foundation and a vented crawl space. Beneath the floor and betweent the floor joists is 30 year old fiberglass insulation.
I want to improve the insulation and eliminate any air flow between the crawl space and living space.
I've read every thing I can find about crawl space design and the merits of enclosing the crawl space and including it as part of the conditioned space. However, i'm wondering if that applies in my case considering there are no mechanicals in the crawl space and there will not be in the future. Can I just better insulate the underside of the floor and keep the crawl space vented?
I thought I could put 6 or 12 mil vapor barrier under the joists, and that would support insulation between the joist. Or better, fasten rigid foam board under the joist and use that to hold additoinal insulation. All joints with either method will be taped and spray foamed for air sealing.
Any major flaws in this thinking? Thanks in advance for any help.
Posted Jan 24, 2011 1:19 PM ET
Edited Jan 24, 2011 1:20 PM ET
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