I have a client that would like some skylights for her porch roof (new construction) to avoid the deep shade issues. It seems that it would be more cost effective and a better drainage detail to use a sheet of something (like Lexan) instead of a proprietary curbed skylight. Has anyone done this? What is the right plastic/glass to use for such an application. This is to be a 4:12 roof with asphalt shingles. I have about 30″ available parallel to drainage between the purlins (logs) and they line up with a 36″ window and 36″ french door, so anything between 24″ and 36″ width seems appropriate. This is Vermont, so a considerable snow load is possible. She would also like two skylights over rooms in the existing house, which will not be operable, but will require insulated glass. Is there some similar non-curb detail that could be employed for an inoperable unit? This would also everything to match better as viewed from the exterior. Thanks for any feedback.
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Replies
Well.
There's the easy detail of slipping flashing under the shingles at the top.....
but what do you do down the sides of this pc. of lexan (or other)? There's no way to step flash a non curb lite.
Personally, I'd go with a velux skylight or a sun tunnel to light these areas. They are made for shingle applications and are known to work.
I've seen several failures on curbed bubble skylights where the curb did ok, but the seal was lost between the curb and the plastic bubble. Similar problem with a homemade flat pc of glass on a curb.
Of course, if you can detail it properly, have at it and sleep well.
Best of luck.
Do the whole roof with corrugated fiberglass.