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What fasteners to use with Cedar Shingles over 1″ IKO Enerfoil?

Evan Macdonald | Posted in General Questions on

My wall composition will be: 2×6 studs, 1/2″ plywood, 1″ IKO Enerfoil (R7), perhaps a breathing mesh? and Cedar Shakes/Shingles. I’m wondering what you folks recommend for a fastener (length/type)?


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  1. GBA Editor
    Martin Holladay | | #1

    Cedar shingles cannot be installed directly over rigid foam, so you'll need to include a layer of Home Slicker (a plastic drainage mat) between the back of the shingles and the rigid foam.

    Here is the standard recommendation for shingle fasteners: "Fasteners should be long enough to penetrate into the sheathing at least 3/4 inch or all the way through." With the 1-inch rigid foam and the 1/4-inch Home Slicker, you'll need to select fasteners that are at least 1 1/4 inch longer than usual. Make sure that your fasteners have a slender diameter, so you don't split the shingles. Needless to say, you want galvanized or stainless-steel fasteners.

    More info here: Sidewall Fastener Guidelines.

  2. Evan Macdonald | | #2

    Thanks for the reply I'll check out the additional info

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