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Housing - Renovation: insulating crawl space

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    • CommentAuthormbartosik
    • CommentTimeFeb 28th 2008
     
    Someone I know is trying to make their house more efficient.
    She has two crawl spaces about 400 sq ft in total.
    This is very inefficient, heat just goes straight out through the floor. I have recommended closing the crawl spaces and opening them to the conditioned space after insulating the crawl space walls.

    She has problems with opening to the conditioned space as there is no good point to do this at.

    My suggested fall back solution.
    Fit bats between the joists, and then fit (with glue and screws) 2" of ridged foam board, making a ceiling out of the foam board in the crawl space.
    • CommentAuthormbartosik
    • CommentTimeFeb 28th 2008
     
    What do you think to my fall back solution?
    • CommentAuthortony
    • CommentTimeFeb 28th 2008
     
    I dont like mixing insulations but it would work.

    Do not seal off the crawl space it should be ventilated.

    If it were mine I would insulate between the joists and then across under them with bats supported on loosely battened strawberry net
    • CommentAuthormbartosik
    • CommentTimeFeb 29th 2008
     
    thanks tony.

    I would be interested to learn why you don't like mixing insulations.
    I can think of one reason: different vapor permeability (2" of foam board is still considered permeable).
    I can think of one reason for preferring two types of insulation: gain the benefits of both, e.g. air block, fire rating, ease of fitting.

    What are your thoughts on this?
    • CommentAuthortony
    • CommentTimeFeb 29th 2008
     
    I'm old fashioned. I get concerned about the possibility of entrapped moisture. Voids in between the two types.

    It will likely be OK to do it your way but more expensive! and how will you get the sheets under there?
    • CommentAuthormbartosik
    • CommentTimeFeb 29th 2008
     
    I haven't seen the opening / entrance , but as long as it is about 20" wide (diagonal of 24") the ridged foam will fit in. It is available here in 2'x8' and 4'x8'. I am told there is very little height, likely 18" to 24" so the boards will use less height than a cross layer of bats, and the boards won't sag.

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