I am in the process of having a timber frame pavilion constructed. The roof of the pavilion will be 2×6 T&G Douglas Fir covered with 1/2″ CDX, followed by roofing underlayment and conventional asphalt shingles. Am I making a mistake by installing plywood over the T&G? Will the expansion and contraction of the T&G cause buckling issues with the plywood. I am trying not to cut any corners and thought the plywood would be the best way to go? Thoughts?
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What's your location? In SoCal I built a fort for Boy Scouts. The four corner outposts were timber framed with 2x6 T&G roof. The roofing felt proves the slip between the 2x6 and asphalt shingles. It was built in 2007 and still looks good today.
I'm located in northwestern PA.
I still don't think you need the plywood
Roofing nail length is important.
Prefinish your show side of the t+g before install. Shrinkage is inevitable.
Thanks for the replies everyone..