new roof deck

Old 02-09-01, 06:42 PM
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I have a 1908 home that has a covered front porch on it. The roof is in need of replacement due to a cruddy job of the last homeowner to re-roof it. Instead of reroofing it, I want to put on a "deck roof" or a balcony accessible from the upstairs. The porch is well built and has plenty of support to hold such a roof, I just can't find any plans on how to bulid it. I obviously do not want it to leak through the porch, but I don't know how to bulid it so it won't. It will need a slight pitch to let water run off. Does anyone have any experience with this? Or know of any site that could help? Thanks in advance for all answers.

Old 02-10-01, 03:27 AM
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I built a boathouse in 1995 with a 12' X 24' deck over it.
We built-in a sloped-to-one-side corrugated aluminum (rust-proof) sheet roof over the boathouse, and then built the deck over it.
You can order the aluminum roofing cut to the exact length that you want to the nearest inch. If you will not have much pitch on it, I would caulk the overlap seams.
It is a permanent situation, and we would have to tear off the deck, hanging joists and all, to re-roof (which I never plan to do, and should never have to).
I have a neighbor that used corrgated plastic sheet roofing over a porch, similar to what you are planning to do. You can use either one. Just plan for it to be permanent since you won't be able to get to it, once you build a deck over it.
Good Luck!
Old 02-19-01, 09:47 PM
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Best way is to use waterproof vinyl decking. Build deck frame as normal, slope joist system 1" for every 8' of projection away from the building. Sheet deck with 5/8" select grade tongue and groove plywood. Call round for vinyl decking company(should probably do this first). Product needs to be professionally installed. Check Material is installed over plywood. Everything below deck stays dry including your lumber. Life expectancy of these materials can range as high as 25 years. Check building code to see if roofing membrane weight and thickness of material is required.

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