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Thanks for the info. That explains it! I'll look for some kind of double-skinned panel with insulation inside. FYI, my roof (Seattle area) sounds similar to UK constructin... asphalt tiles on felt underlayment on wood sheathing on trusses. The insulation is on top of the ceiling with a...

I had a new roof installed 15 months ago. Because I switched to a ridge vent, I blocked my 2 attic gable vents with plywood nailed up over the vents from the inside. The 2 pieces of plywood are now covered in spots of black/grey mold. Any ideas on what could be causing this? At first I...