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Question:

Can I install rigid insulation between roof decking and shingles on a sloped roof?

Can I install rigid insulation between roof decking and shingles on a sloped roof?

Answer:

Lot of info missing to give you a good answer. Thickness of insulation. Slope of roof. But what it really comes down to is the building code in your area, contact local building inspector,
No. The shingles are applied directly to the decking (over felt paper). Nailing through rigid insulation will either cause dips from driving the occaisional nail too far, or the shingles won't be nailed down tight and will blow off in the wind. Insulate under the decking.

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