Deck on roof of addition

daniel_mdJune 3, 2006

I have searched the forum to find several people doing this but none seem to address the questions I have. I plan to build a deck on the roof of a single story addition to my house. There will be a door leading out to the deck.

Here is my plan so far:

Redo the roof of the addition, making it almost flat (slope of 1/48), covered in 3/4" plywood.

Cover with foam board insulation.

Cover with .06" EPDM, fully adhered.

Lay 2x6 sleepers on edge, tapered to match roof slope, on pads, and attach a rim joist and decking.


Should the other end of the sleepers be attached to a ledger board?

If so, how should that board be attached to the house, and is it okay if I penetrate the EPDM going up the wall behind the ledger when attaching the ledger (vs. not having the EPDM go up that high)?

Should the EPDM go under the door as flashing?

Should other flashing go under the door and over the ledger?

The closest I have come to an answer is from this post, as he seems to be doing something very similar, but it still doesn't completely answer my questions:

How to build a deck over a flat roof correctly

Thanks so much for any help!!

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torch down roof.
The deck rests on the roof. I would avoid a ledger because you're asking for trouble with leaks. If you do go with a ledger make sure you silicone all the bolts. Don't penetrate the EPDM at all. If you do go with the ledger put washers behind it so there is room for drainage.
As far as flashing, I would put it under the door, but it's hard to imagine the layout you might have and where and if it would be beneficial.
Distribute weight with horizontal boards on the roof.
Make the deck so it can come apart with screws and removable panels to get to the roof if needed.
Make sure you have the wood waterproof.
I never used this stuff so can't vouch for it but check it out.
Also, being it's so low it will be alot of moisture for the wood. This company makes a product to prevent joist rot.
P.S. This project must be done right so I would definitely consult with a local contractor for advise and building codes as to what is good for your local area.

    Bookmark   June 4, 2006 at 7:32AM
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forgot the link for the joist protector stuff.. never used it but since you will be low with moisture.. and have no plans to remove this thing for repair.. you might want to consider this stuff or stuff like it to aid you for the long haul.

    Bookmark   June 4, 2006 at 8:00AM
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A torch down modified makes a good roof,I woudent go the glue down,lay the stringers flat not on edge,Like the Gorilla says do not put any holes in the roof. Flash under the door melt the roofing to the flashing. I always have my roofer guy place a cant strip all around the house side. John

    Bookmark   June 4, 2006 at 10:20AM
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Thank you both for your replies! One question about the stringers, though. How would I compensate for the slope of the roof if I lay them flat? The deck extends 8 feet from the house, so that means a 2" drop.

    Bookmark   June 4, 2006 at 11:23AM
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here's a link that may be useful.

Here is a link that might be useful: sleeper tips

    Bookmark   June 4, 2006 at 7:15PM
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another link where they discuss it.. read the whole thing.. it's question/theory, answers..etc
You'll have a few techniques to consider.

here's another link to a rooftop deck on bob villa.. It has video around 3 minutes long... the last 30 seconds shows you a technique they used with sleepers.

Here is a link that might be useful: some sleeper tips

    Bookmark   June 4, 2006 at 7:42PM
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2'' fall in 8' with a torch down is way too much,in 8' 1/2'' is fine. landing the stringers on edge is just asking for trouble the weight is not spread out enough,just for a little more protection I have Rick the Roofer leave me enough material for buffer strips of the modified and I lay them under the stringers granulated up. J

    Bookmark   June 4, 2006 at 8:45PM
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This forum topic is a small but subtle reminder on why I hire a contractor to do some things like roofing. I can install deck drainaige systems under my 2nd story deck but that's because I'm in the shade when doing it, roofing is hot work.... to hot for me

Here is a link that might be useful: Deck Drainage system

    Bookmark   April 23, 2008 at 11:40PM
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