Q: How do I fasten cedar shingles to sidewalls covered with rigid foam?

A: Paul Eldrenkamp, owner of Byggmeister, a custom remodeling firm in Newton, Mass., responds: That depends partly on the thickness of the foam. If it's 1 1/2 inches or less, we apply Cedar Breather over the taped foam to provide back venting, and fasten the shingles to the structural sheathing beneath with 2 1/2- or 3-inch stainless steel nails...

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