Hello-
I am doing a second floor addition on my brick house, and adding a roof deck off the master bedroom above the existing porch. The trick is, I want to recycle a bunch of good, 50 year old 2x6s back into the project, but I can’t tell if I’m trying to do too much or if I’m missing something. It seems like it comes down to my needing just the right flashing detail at the roof deck railing posts.
I plan to do the basic deck and flashing details as seen on the nice roof deck in issue #166. But I want to have the structure of the roof deck floor continue another 4 or 5 feet beyond the 8 foot deep deck to make a canopy for the porch and woodpile below. (The recycled 2 x 6s are up to 19 feet long.) I figure I could just put some clear polycarbonate on the 2 x 6s and flash it up under the drip edge from the deck. But I need a gutter to drain the roof deck, though I don’t want the gutter to be out at the end of the canopy. While I might normally like to have the 4×4 posts sit outboard of the fascia, with a gutter running by there, it seems like I should have it flush with the inside of the fascia. So then with water running by there, I suppose I then just need to make sure I have it very well flashed there under the decking. If anybody has any idea of a simpler way to do this, I’d love to hear about it.
Thanks.
Replies
There is no simple way to do it, but here are a couple refinements -
Have the gutter custom made at a sheet metal shop. They can help you refine it so that the gutter and the edge flashing of the roofing are one in the same. Avoioding that lap reduces chances of a keak ther to roth the cantilever off.
Plan this so that the edge of the roof is a bit further out than shown beyond the post. That way, the post flashing and the edge flashing and sealants don't conflict with one another.
use a subfascia at the end of the cantilevered jopists or use purlins along all of them. Purpose is to tie thjem together. Such a large overhang will flex. You want it all to flex together when it loads with snow or collects wind. if each joist moves independently, the fastening and seams in the plycarb will fail
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