Add insulation to dormer attic?
I need some more advice. I live in North Alabama — climate zone 3. Most of our home is a built up cathedral roof system. However, we have 2 gabled dormers with a small attic space — framed out with 2x4s 24 inches on center. Currently, there is just 2 inches of XPS foam attached under the 2×4 rafters, sealed with spray foam at all seams (thermal camera looks like it is sealed pretty well). I believe there is a 3″+ air space behind the foam to a ridge vent.
What would be the best was to add R-value to these areas?
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