Wood deck on sloped roof


Old 12-30-04, 07:17 AM
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Wood deck on sloped roof

I need to frame a flat roof with a pitch over a 24'x24' garage. On top of the roof will be a wood deck the same size.

Does anyone have any ideas on how the deck can be built on top of the roof? Can it be laid on top of the roof with some sort of padding? Or should we extend posts up and have it so the deck is not touching the roof?

Any info would be great.

Old 12-30-04, 07:40 AM
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aerial, Welcome to the DIY Forums.
I am not an expert in this field however you may want to click on the link below for some information on your project. Go to the 5th post in this thread. Good luck on your project.

Old 12-30-04, 10:20 PM
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Every one of the 'decks over a roof' I have ever dealt with have the same problem -- the roof starts leaking and you have to remove the deck to get to the roof to repair it!

Plan accordingly. Install a 50 year roof BEFORE you put the deck above it. The only 50 year roof that I'm aware of is metal.
Old 01-09-05, 10:37 AM
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If the roof is not roofed currently there are many products to choose from that would be able to be walked on permanently such as decksitech or modified *****um. You would taper the rafters/floor joists 1/4" to the foot to allow the water to run off and then use 3/4" cdx t&g plywood subfloor. Then you would call a water proofing specialist to come and install water ever waterproofing system you decided to go with.

The other option if the foofing is already on is to palletize the deck system. You would build the framing for the deck in sections with the bottoms tapered to match the roof so the top of the deck will be level. You would then screw down your deck to this floating framing system. This system also works well over a modified *****um roof or melted seam roofing.

You will need to lag 4x4 posts to the outside walls of the garage at 4'-0" o.c. to allow you to install railing.

I hope this helps.

Brian Garrison
General Contractor/Professional Building Designer
Old 01-12-05, 03:40 PM
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Lefty is Correct

Lefty is correct.

No roof deck system is worth the trouble.

Unmentioned to date is whether your existing roof framing structure can even meet building code to be used as a deck itself or support one constructed on top of it.

In most instances, your existing roof will need to be completley demolished and reframed just in order for it to meet minimum building codes as a walk out deck or to construct a deck upon it.

Rarely if ever worth the trouble or money.

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