What is the best way to insulate vented crawl space? Should we use krft faced bats and put the vapor barrier on top? Should we put the vapor barrier on the bottom? If we do put the vapor barrier on top, what will keep the fiberglass from pulling loose from the kraft paper over time ?
I would like to see icynene sprayed in the joists spaces but, the budget does not allow it. I would really apreciate any feedback.
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>>What is the best way to insulate vented crawl space? Should we use krft faced bats and put the vapor barrier on top? Should we put the vapor barrier on the bottom? If we do put the vapor barrier on top, what will keep the fiberglass from pulling loose from the kraft paper over time ?
The most important thing to get a good crop of mold growing down there is to make sure the kraft paper facing touches the soil.....
IOW, don't use paper lined insul at all.
Check out the Building Scince corp web site for info on the best way to deal with your crawl in your climate and HVAC setup - different climates and systems call for different approaches.
But none of them call for paper.
Oh!! Wait a minute: If you're putting the insul between the floor joists: vapor barrier goes up.
But consider insulating the perimeter and conditioning the space, instead.
Hey, thanks for reminding me about the builing science corp. . I have there book"Building in Cold Climates". I even attended a seminar sponsored by them. I will definately be checking that book for a solution.
I recently seen insulation that is totally wrapped in a plastic bag looking thing it was a fiberglass product. I believe it was made by Johns Manville sold at Mynards. Looked like if well stapled it'll stay in place.
I will give that some thought. I am sceptical of using a plastic product because it isn't permiable. I have seen to many condensation issues associated with plastic vapor barriers. However, the encapsulated insulation you are talking about may have a different vapor barrier other than plain old plastic.
I had a crawlspace done last year and they used unfaced and then stapled a screen up that was like a cross between window screen and fishing net. Keeps the kritters out. Worked great. I did mine in Icynene. It made a big difference. Still have some air infiltration issues but I'm working on it. Your right, it cost triple what the FG costs.