Insulating Low-Slope Roof of Rowhouse Without Cockloft
Insulating flat roof and/or cockloft: “stone wool” panels?
Hi all. I’m trying to find a solution for insulating a flat roof (it’s slightly pitched) on a rowhouse in Brooklyn. The ceiling (and the whole house) has been gutted. Contractor wants to use spray foam. (Right now the wooden joists and wood underside of the roof is all exposed; there’s no cockloft.) I’m an environmental journalist so that’s really not an option as far as I’m concerned. I’m wondering if I can use Rockwool “stone wool” panels over the existing exterior roof surface, which is not perfectly even, before adding another layer. (I want to add solar panels after as well.) Or should I ask them to rebuild, vent, and insulate the cockloft with cellulose or Rockwool batts, like most people around here do with their flat roof houses? Any advice would be very much appreciated.
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