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Is it okay to put an unvented hot roof under a wood shingle roof?

I live on Cape Cod and I would like to put spray foam on the roof and then Sheetrock . There are wood shingles on the roof now and because I am in a historic district I have to keep them. Thank you for your help.
Randy

Asked by Randy Aubrecht
Posted Jun 12, 2014 7:43 PM ET

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2 Answers

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1.

Randy,
Are the cedar shingles nailed directly to the plywood deck, or are the shingles nailed to skip sheathing?

If the shingles are nailed to skip sheathing, the next question is: are the skip-sheathing boards the only type of sheathing? Or is there continuous plywood under the skip sheathing?

Answered by Martin Holladay, GBA Advisor
Posted Jun 13, 2014 6:13 AM ET
Edited Jun 13, 2014 6:20 AM ET.

2.

The shingles are nailed directly to tounge and groove sheathing.

Answered by Randy Aubrecht
Posted Jun 13, 2014 8:27 AM ET

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