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Unread 05-19-2022, 10:10 AM   #16
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Greg, I don't think you'll find either the Laticrete 9235 or the Custom 9240 is recommended as the sole waterproofing layer for exterior decks over occupied space as you're recommending.

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Unread 05-19-2022, 01:56 PM   #17
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Noble makes a deck material rated for use over occupied space. https://www.noblecompanyonlinestore....rack-isolation

Flashing and connection to drains will be the harder part, but critical to an overall satisfactory job.
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Unread 05-21-2022, 04:59 PM   #18
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Thing is, Composeal Gold IS recommended, but it failed miserably by extreme shrinkage under heat. I wouldn't trust any roll of plastic not to become brittle and shrink on a deck exposed to sun in the south, based on what I have seen in tearing decks out. While I did not install the failed products, there was nothing wrong with the way the were installed, purely a product failure.


Seems to be conflicting info, the above says 9240 is rated for exterior decks, perhaps it is old? Other Custom info says contact customer service about decks. Hmm.
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Unread 05-22-2022, 07:38 AM   #19
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Still puzzled by this. Composeal turned brittle and shrank.

Doesn't look it, but it is over backerboard, which was perfectly fine and well attached. Looked like it was installed correctly.

I would encourage a membrane embedded in plastic paint based on what I have seen. Noble is cool. Not Redguard, it is not tough enough, it tends to shred under foot.

If you keep those drains, it will pose difficulties avoiding a bird bath in the middle of the floor. At least add a center drain, consider trench drains like whatadrain. You want to attach your waterproofing to the drain. You need a Kerdi drain or similar style with the cotton candy on the edges or a plastic bonding flange. I might consider KerdiFix helpful in that attachment, depending on the drain. However you do it, the junction of drain and membrane is critical and must be thought ahead to have a proper drain for your membrane to bond to. I would still tear the wall off and ditch the drains, much more trouble free.

Last edited by Kyras; 05-22-2022 at 07:59 AM. Reason: clarity
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