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    Dreyfus1's Avatar
    Dreyfus1 Posts: 1, Reputation: 1
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    #1

    Jun 14, 2010, 02:28 PM
    Attic insulation and venting
    I have a 14'x28' shed that will be heated. I want to insulate the underside of the roof. There are no soffit vents, only gable vents. 2 questions: how should the venting be handled, and with 2x4 construction how can I get a higher r-value. r13 is standard for a 2x4 wall.
    21boat's Avatar
    21boat Posts: 2,441, Reputation: 212
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    #2

    Jun 14, 2010, 09:56 PM
    Quote Originally Posted by Dreyfus1 View Post
    I have a 14'x28' shed that will be heated. I want to insulate the underside of the roof. There are no soffit vents, only gable vents. 2 questions: how should the venting be handled.
    Since you only have cross ventilation you either install a ridge vent on the roof or use soffits vents but not all 3. only 2 of the 3 should be used


    Quote Originally Posted by Dreyfus1 View Post
    2x4 construction how can I get a higher r-value. r13 is standard for a 2x4 wall.
    Hands down Spray foam is the best R per inch here. Its 3 times more expensive then Standard fiberglass but pays off quickly
    KBC's Avatar
    KBC Posts: 2,550, Reputation: 487
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    #3

    Jun 14, 2010, 10:27 PM
    Higher insulation value?

    Polyisocyanurate board,R7 per inch.Finding it might pose a problem, here it's around an 8 hour round trip(for the factory seconds,which are more than 50% off new/firsts)

    Installed between each rafter you can space them down by installing a 1X strip to each rafter,(against the roof line) to space them for venting, then using the soffit vents and ridge vents,you can have a heated room with proper venting.

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