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    ladijurcak's Avatar
    ladijurcak Posts: 10, Reputation: 1
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    #1

    Mar 27, 2011, 06:45 PM
    Insulation, how much and where to install for Florida house
    House was built in 1944. No insulation in the in between joist. Celing-drywall/air/plywood-on the top covered with tar. Can I put insulation on the top of the plywood and what thickness/R-number.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #2

    Mar 27, 2011, 06:52 PM

    The air space between the drywall and the plywood is the place for insulation. You also need a vapor barrierimmmediately above the drywall and also some soffit vents. However, this would require dropping the drywall. I'd call some insulation contractots in your area to see if any of them can bid a blown in insulation which would only need small holes every few feet.
    ladijurcak's Avatar
    ladijurcak Posts: 10, Reputation: 1
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    #3

    Mar 27, 2011, 07:27 PM
    Comment on ballengerb1's post
    Thank you for your advise. So if they blow in the insulation, how and where the vapor barrier would go?
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #4

    Mar 28, 2011, 11:48 AM

    If you go with blown in they can not install a barrier. You could go with a slightly less effective paintable one. PRP1, Perma-Prep Interior Latex Vapor Barrier Primer/Sealer, Not Avail
    ladijurcak's Avatar
    ladijurcak Posts: 10, Reputation: 1
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    #5

    Mar 28, 2011, 07:05 PM
    Since the celling is in pretty bad shape, I'll tear it down and install the insulation in between the joists. What kind and how should I install barrier?
    Thanks.
    ballengerb1's Avatar
    ballengerb1 Posts: 27,378, Reputation: 2280
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    #6

    Mar 29, 2011, 08:02 AM

    Measure how deep your rafter cavity is and buy rolls or batts the same thickness, I'd get craft paper covered. After stapling in place cover the entire ceiling with one big piece of plastic, like 6 mil visqueen.

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