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grmachine 05-23-2012 04:23 PM

Building a deck on a tar and gravel roof
Hi everyone!

MODs: I hope this is in the right section; feel free to move it if it's not.

I want to build a floating deck on a 10x20ft tar and gravel roof (sitting on top of a garage). I have a general idea of how I want to do this, but I need some advice to make sure that my plan is sound or ideas on a better way to do this.

Basically, I wanted to build a 2x4 frame where I want the deck to sit, lay some 2x2 sleepers every 16 inches on top of the frame and then just build my deck on top of that. Seems easy enough except for levelling the surface. The roof doesn't slope to a gutter; it slopes inwards to a drain in the centre of the roof so as I understand it, I would have to level the sleepers with something like Bison deck supports. I also want to try and make the deck relatively easy to remove from the roof so that it can be taken off and put back on if/when roofing repairs need to be done, so I would assume I'd have to build in sections in that case.

Is there a "proper" way to do this? I've looked around quite bit both on this forum and other sources on-line, but haven't found a lot of of useful information.

Any help would be greatly appreciated!!

Bob Mariani 05-30-2012 07:39 PM

your approach is on the right track. Build a frame of "squares". Taper the main joists to level the deck. ,make the decking in 2X2 sections that sit into or onto the frame. Now it all can be removed easily. Use screws for everything. (not drywall screws)

user1007 05-30-2012 10:00 PM

Are you sure the existing structure of the garage roof can support the dead and live loads that will come with a deck? Seems like you may need drawings, engineering signoff and a permit and inspection for this.

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