has anyone ever flashed a skylight to a polyurethane foam roof surface? Any ideas on the best way to proceed?
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I'm not sure exactly what you mean by a 'polyurethane foam roof surface', but I will assume you're talking about a roof with a crib built up on the roof deck and then spray foamed, then furring across the crib to which some sort of roofing material is fastened.
If that's the case, you'll have to build a chase through the roofing material, the foam, and the roof deck right down to your ceiling level. Insert your skylight. Some have integral flashing, in which case you'll have to strip back the roofing to slide that under on the upper half, and then roof over the lower half. Otherwise, flash it like a chimney.
Skylights, BTW, are one of the most leak-prone roof penetrations I run across. It's lovely to have that daylight and/or fresh air venting available, but they are without a doubt a PITA.
Dinosaur
'Y-a-tu de la justice dans ce maudit monde?
thanks for your response. the issue i am facing is that the spray on foam is the final surface on my roof... no furring, no rubber membrane, just foam. most people think this is ludicrous yet there are several in my neighborhood that actually seem to hold up rather well. I'm curious about flashing because not much sticks to the foam... the foam guy says just to re-spray around it for flashing. thoughts or comments?
michele
Sorry it took me a while to answer you; my computer has been maladjusted for a few days....
Given the situation you describe, and if you intend to keep things that way, I would say you've got two choices:
1. Forget the skylight. They're problematic even in standard roofs; I wouldn't want to hazard a guess about how well you could seal it in your situation, but if I had to, I say it's gonna leak.... Or,
2. Take your foam guy's advice. It's his foam, he ought to know. But as for long term, I am not optimistic. Your call, michele....
Dinosaur
'Y-a-tu de la justice dans ce maudit monde?