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hey all,

I’m considering having blown-in fiberglass insulation put in the crawlspace below my townhouse roof. It’s a standard 20×50 flat roof, and currently there is nothing there but dead space. I’ve gotten estimates of around $2100 for a 12-inch layer of insulation and two vents installed. This is supposed to give an R-38 rating. Anyway, has anyone who has had this done (Dave in Bed Stuy, I see you’ve posted on this) seen demonstrably lower heating bills? How long should I expect for the insulation to pay for itself? Any before and after numbers would be welcome. Also: the insulation guy I spoke with said a vapor barrier (i.e. plastic sheeting laid below the insulation) is unnecessary. Is that the case? Thanks to all!