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Waterproofing over living area

Waterproofing over living area

Waterproofing over living area

(OP)
I have a client who wants a garage with a flat roof which he is basically going to use as a deck.  He wants to use wood decking.  Can someone point me in the right direction on how to waterproof this?  I am planning on putting plywood over the framing and place some sort of waterproofing membrane over this, but once the deck screws puncture this, doesn't the membrane lose its purpose?

RE: Waterproofing over living area

What you want to do is create vertical columns stubbing up from the roof (that is waterproof) and then build a wood deck above the roof some distance.

The columns can be flashed properly to prevent moisture from getting through.  Also, the deck should be built in such a way as to allow future access to the roof should a leak occur or a new roof be needed.

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