Nailing into SIP
I have completed a small 10×12 timber frame and have built SIPs for the roof. (4″ polystyrene sandwiched between two 1/2 CDX). I was planning to cover the SIP with 30# felt and nail cedar shingles directly to SIP. Is it possible to nail directly to SIPs or is it more appropriate to install furring strips and decking to create a breathing space and keep the roofing nails from penetrating the SIP? I’m near Indianapolis, zone 6. I do plan to carefully tape seams and spray foam insulate the joints. Any input would be appreciated.
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