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Old 05-01-2016, 11:35 AM   #1
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Installing a 45 degree wall in a corner shower (cement backer to concrete block)


Hi everyone!

I am going to be finishing a basement bathroom, and there is a stubbed out shower in the corner. I am planning to install a 12 inch wide 45 degree wall in the corner to run plumbing and a shower head into the stall. I want to tile over everything.

I am no expert, this is my first ever tile job, so I wanted to post my plans and see if I have any obvious no-no's. I have already ground the walls and floor down to remove paint using a grinding cup. I plan to use pressure treated 2x3's with a 45 degree cut along one side, and tap cons to attach them to the concrete block. After that, I would attach the cement backer board to the 45 degree side of the 2x3's. I would then finish the seams by using alkaline resistant joint tape, and thinset. Finally, apply liquid membrane (RedGuard) and tile over it all.

Does this sound like a decent plan? Anything you would suggest changing?

I appreciate your feedback!
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Old 05-01-2016, 12:01 PM   #2
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Re: Installing a 45 degree wall in a corner shower (cement backer to concrete block)


Pressure treated indoor is not a good plan unless it's kiln dried, which I've never seen. Use regular kiln dried studs. Having said that.....I don't think it would be a disaster since you're gonna fasten them to the block wall. Is the wall dry, any evidence of moisture ever? Block walls below grade are notorious for holding moisture.

What's the plan for the shower floor? Are you gonna use a molded basJaz

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Old 05-01-2016, 12:18 PM   #3
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Re: Installing a 45 degree wall in a corner shower (cement backer to concrete block)


Thank you for the reply. If you don't mind me asking, why is pressure treated wood indoors not a good plan? I see it used all the time on basement floors, so I am just curious to learn more about this. I can surely use regular studs if that will suffice.

The walls are dry, and I have never seen any evidence of moisture.

As far as the shower floor, there is an existing concrete pan, and I will be building a brick curb on top of it. I posted about this before, and I will be following cleveman's plan outlined here:
http://www.diychatroom.com/f80/water...0/#post2882642

Thanks again!
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Old 05-01-2016, 10:35 PM   #4
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Re: Installing a 45 degree wall in a corner shower (cement backer to concrete block)


If you have a concrete block wall which you want to use as a shower wall, then don't mess around with building it out with a studded wall.

If it works at my local ymca, it will work for you.

Just waterproof the concrete block with some hydroban, aquaban, redguard, whatever you can get your hands on. Then tile the wall.

Some will tell you that you will have a lot of lippage in that wall. If your mason had any skill at all, that wall will be fine. If they had known that you would put a shower in that area, they would have just cut the joints instead of striking them. Won't matter now, you will thinset that wall and backburn your tiles or vice versa and if you think you will have a lippage problem, you can go with smaller tile. A 6" tile looks nice on a wall, and another way to reduce lippage is to use a random pattern. So don't stack the tile straight up, rather use a 1/2 bond or random bond.

In my neighborhood, where the homes were built in the '70's with concrete block basements, a shower was built in the basement when the basement was built. The shower walls were 4" concrete block and acted as a stabilizer against the outside walls coming in.

There was a simple floor drain underneath, and the plumbing to the mixer was exposed on the wall. This shower was not used everyday.

I don't know what type of luxury shower your are looking for, but you could take this basic design and just put some epoxy paint on the walls as well. You could even leave the plumbing supply exposed.

As far as your angled wall, that is a bit of a challenge. You could run the plumbing up the corner, then frame a wood wall in the 45 degree area. Set it up off the floor on a course of brick or block. Attach it to the intersecting walls by screwing a 2x4 to the intersecting walls, and attach the 45 degree wall to this, then put tilebacker on top, tape.

Feel free to beat this plan around a bit and hopefully we can come up with a plan that will work for you.
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