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Discussion Starter · #1 ·
Greetings All, appreciate the expertise existing in this forum.

I am a home remodeler, not a professional, but have done 4 homes completely down to the studs, including many many square feet of tiling floors, wall, ceiling, bathroom.

I have a very difficult problem to diagnose. I have a leaking shower pan/wall (not sure), that essentially is filling up the shower liner "bowl" and overflowing over the top of it, inside the wall cavity. My question is, if the shower was built correctly, would it be normal for water to make it to the pan liner at all?

Here is what I've done:

1) Built shower walls, with wood blocking 8in up from the floor. Wood subfloor on bottom, covered in concrete board

2) Put in cement sloped (minor slop) floor, to center drain hole

3) laid in Oatey gray pvc shower liner, and nailed 12 inches up wall. Folded all corners, used glue and Oatey corner damns.

4) Put in additional cement slope floor over top of liner, sloping to center drain.

5) cut liner X over Oatey drain flange/base, sealed and clamped down nicely

6) water drain test, 4 hours, no loss of water

7) Full layer of 6mil plastic over all walls, overlapping inside shower liner by 6inches. Installed concrete board on wall, down to about the 3in mark above floor liner. Taped and Cement sealed all seems in concrete board, including 17" corner seat

8) covered ENTIRE shower with two full coats of Mapei Aqua Defence

9) thinset and shower tile installed, used leveling system

10) grouted with Fusion Pro grout

I have access to the walls on three sides of this shower, so have been able to open them up as part of the diagnosis of this leak. I can see the back side of the plastic sheeting, and near the bottom of the walls, can see the shower liner going down to the floor.

Now, if you point the shower head at floor only, you get no filling of liner bowl, no leakage

If you point the shower head at the seat, within 60 seconds there is filling of the liner bowl (you can feel it like a balloon on back side of wall), and eventually it fills up to top and overflows.

On the shower tile site, I've used a magnify glass and hi power light to look for ANY crack in the grout. Nothing. I've even silicone caulked all corners.

Could anyone make a guess how water is getting into the shower liner so fast?

Attaching some photos



Stephen

Cary, NC

Wood Flooring Sneakers Floor Luggage and bags


Light Wood Line Rectangle Road surface


Standing Gas Wood Paint Concrete


Fixture Wood Building Flooring Floor


Water Blue Azure Rectangle Fluid
 

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What material is the tile you used?

Problem is at the seat, I do not see any banding run up the wall at the joint. There should be 2” up 2” out, sealed to the wall and seat.

The seat should have been foam glued to the wall or a redi bench.

The way the floor is sealed I doubt any water is getting to the pan liner.

Tom
 

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Discussion Starter · #3 ·
What material is the tile you used?

Problem is at the seat, I do not see any banding run up the wall at the joint. There should be 2” up 2” out, sealed to the wall and seat.

The seat should have been foam glued to the wall or a redi bench.

The way the floor is sealed I doubt any water is getting to the pan liner.

Tom
Tom, Thank you. I am not sure what 'banding' is. Could you elaborate for me? I sealed the two concrete boards going up the wall with concreate mesh tape, and then concrete over that, pushed into joint. Then all of that got 2 coats of Aqua Defense.

The seat is treated 2x4 and they are screwed into the studs by 3 inch nails. I stood on them (250lbs), so make sure there was no movement. Then those 2x4 seat frame was covered in concrete board, with tape and concrete mud at joints, and then sealed with 2 layers of aquadefense.

Stephen
 
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