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Old 02-05-2014, 11:01 AM   #1
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Custom Shower - Continuous tile floor


So I've gutted my bathroom completely and starting from scratch - I'm building a large custom shower on one end of the bathroom.
It will be about 44"x93" and have a glass wall front
-- the existing subfloor was 5/8" real plywood (not OSB) and we added another layer of 1/2".
-- now we are adding a third layer of half inch going against the grain of the second layer BUT...

... What we want to do is have a continuous tile floor that goes right into the shower from the main floor of the bathroom (no lip or ledge to step in).
1). We were thinking of leaving the third layer of ply off in the shower to be able to slope a base for drainage

2). we don't know if 1/2" is going to be enough slope to accommodate the drain (which will be in the centre)

3). We don't know if the 1 1/4" subfloor in the shower (plus base concrete) is enough for the tiles

4). We don't know how to properly waterproof and build the shower floor so nothing leaks through. I've built shower bases before but always had a tray or prebuilt pan that was rubber membrane based or Schluter based
- had an idea to first seal the plywood with RedGaurd waterproofing paint/gel but don't know if that will be enough

Here are some pics of the space...
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Custom Shower - Continuous tile floor-image-3797819916.jpg   Custom Shower - Continuous tile floor-image-252468557.jpg   Custom Shower - Continuous tile floor-image-3637270875.jpg  
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Old 02-05-2014, 11:05 AM   #2
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Going to need at least 1/4" per foot.
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Old 02-05-2014, 01:32 PM   #3
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@joecaption -- we were thinking of using one of those trough style drains so we can get the 1/4"/ft drain from every location
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Old 02-05-2014, 01:33 PM   #4
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Quote:
Originally Posted by joecaption
Going to need at least 1/4" per foot.
Replied below...
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Old 02-05-2014, 03:09 PM   #5
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You need 1/4" to 1/2" of slope to the drain location, and the "pan" area must be able to hold 2" of water without escaping. You can get a zero entry shower by having the slope start 48" away from the drain to the far side of the shower and leave the rest of the room flat. But, you will have an obvious line where the shower slope meets the rest of the room. If you want a completely smooth transition with no line, the entire room has to be sloped into that drain. To build what you want here will probably require dropping the joists and reinforcing them as well as increasing the overall height at the other side of the room, then sloping down to the drain at the side of the shower. In other words, a wet room. Built incorrectly, you can easily flood your home. No amount of waterproofing will compensate for an incorrectly sloped drain.

If you wanna read about how NOT to do it, look here.
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Last edited by Live_Oak; 02-05-2014 at 03:19 PM.
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