Flashing a Deck with a Stucco Ceiling Under It

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Old 08-27-14, 10:03 AM
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Flashing a Deck with a Stucco Ceiling Under It

Hello:

I have a deck that has had water damage because the contractor never installed flashing, and I need to rip it down to the studs. While the subfloor is not fine, which is why I ripped it out, the joists are laminated and are reusable.

I'm about to lay down a new subfloor, but I can't seem to figure out how to install the flashing. It's a stucco house, and the deck is on the second floor. Directly under the deck is another patio. The patio below has a stucco ceiling, so lath, stucco, can lights, and speakers are connected to the joists of the deck (See attached photos).

How should I flash the deck? I've been searching on the web, and all I see is how to flash the ledger, so it channels water directly UNDER the ledger, but I can't do this as there is a patio below and the stucco is there. Suggestions? Keywords I should be looking for in my searches?

Thank you, all.


Saul
 
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Old 08-27-14, 12:08 PM
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Flashing is not what you want, because it will just dump water onto the new floor surface you install. I'd suggest going with a layered, impervious membrane, sloped to allow all water to run off. With upturns at the walls, to be covered by new stucco. And with a final, non-skid walking surface on top.
 
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Old 08-27-14, 01:36 PM
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Thanks! From your recommendation, it appears I need an "impervious membrane." However, I'm still a little confused. If I have a membrane on TOP the SUBFLOOR, I'd still be drilling into the membrane. See, we have aluminum decking that goes on top of the subfloor for our finished look. Further suggestions?
 
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Old 08-27-14, 01:51 PM
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Attaching any kind of decking by drilling through a membrane and/or subfloor will result in leaks. You don't want that to happen, again, do you?

I suggest getting rid of the aluminum decking idea, and using something else--preferably a glue-down vinyl product, or something similar. Even ceramic tile would work, if the floor framing/subfloor are rigid enough.
 
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