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I had the same situation when I purchased my current house. I considered your solution strongly but ended up calling a insulation contractor to spray the walls with foam. It cost a little more but saved a lot of aggravation and tightened up the crawl space nicely. I then installed batts in the floor.
I don't believe a vapor barrier is necessary between the foam and the board unless you anticipate a moisture problem, and that would already be obvious IMO.
Doesn't foam require something fireproof over it???Bud
Not quite sure I understand. In a crawlspace? Yes it is required to be covered in a mechanical room or living space but not so sure about a crawlspace. I was told by the BI that it wasn't, but they have provided misguided info in the past.
I was not saying that it did need to be covered. Just a question,
because I originally thought it needed to be covered,and was asking for my own reference...I am considering the same thing as the OP..
Bud
Just did a crawl space where the BI was wanting firerock over the icynene.Our installer satified the requirement by spraying a coat of FireFree88 over the icynene as an ignition barrier
Barry E-Remodeler
In a living space, yes.
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Edited 7/17/2007 5:27 pm ET by Piffin
Here, also required in a crawlspacethough some may live there
Barry E-Remodeler
I do this all the time. Around here, (Detroit area) were required to run the rigid above grade, and cover that with 1/2" drywall for a fire barrier.
If I were you I would not insulate the floor. Just run a couple of heats in there. Treat it like a basement.
Insulation between the two areas would only (maybe) keep the crawl space a little quieter. Essentially you'd be insulating between two conditioned areas.
That type of foam IS a VB so no you don't need another.
Welcome to the
Taunton University of Knowledge FHB Campus at Breaktime.
where ...
Excellence is its own reward!
I agree with MSA1, insulate the above grade walls, close off vents and forget about insulation in the floor. Basically what you have is a short basement. As far as fire code our building department requires a fire resistive barrier over the foam, or maybe look at alternate insulation types. I have seen the encapsulated batts, but installation is a mess, have to secure somehow to the top of the wall on the plate and they hang down and look like a mess.