Kerdi over old sloped morter bed

[bishoy takla]

Hello everyone,

I need some advice for a DIYer.

I am renovating my walk in shower on concrete floor from 1980.
I removed the wall back to studs and removed the dry pack floor and old liner.

1- Can I leave the sloped morter bed in place and waterproof it using Kerdi fabric?
I have an off center drain, Can I cut-to-size and use regular 1" Kerdi Board on the floor? Assuming I can leave the old morter sloped bed.

What type of drain I can use to replace the drain in the picture?

Thanks in advance.

Bishoy

[bishoy takla]

Hello everyone,

I need some advice for a DIYer.

I am renovating my walk in shower on concrete floor from the 1980s.
I removed the walls back to the studs and removed the dry pack floor and old liner up to the sloped morter layer.

1- Can I leave the sloped morter bed in place and waterproof it using Kerdi fabric?

2- I have an off center drain, Can I cut-to-size and use regular 1" Kerdi Board on the floor? Assuming I can leave the old morter sloped bed.

3- What type of drain I can use to replace the drain in the picture? Do I need the kerdi adaptor kit or jist the Kerdi drain.

Thanks in advance

[Shady at Best]

Lets see the picture.
You will need a drain designed to work with kerdi or similar membrane systems. Why doing you want to remove the old mortar bed?

[Kman]

Welcome to the forum, Bishoy.

The drain that you'll want to use with Kerdi has to be embedded in mud at the same time the mud is placed, so you can't really do that with an old mud bed. About the best you could hope for would be to chisel out the mud in the area where the drain would go so that it could be set properly. But I wouldn't go to all that trouble, when a new mud bed would be just a little more work, almost no money, and (done properly) would likely be better that what you have there.

You wouldn't use Kerdi board on the floor for anything like that. The floor has to be sloped from the perimeter to the drain, something Kerdi board isn't designed to do.

Unfortunately, your picture(s) didn't load. Try uploading them from your phone or computer using the paper clip icon in the reply box.

[bishoy takla]

Thank you Kevin and Travis for the advice. I am reattaching the pictures.

[Kman]

I definitely would not plan to put a sheet membrane over that floor. If you want to use the kerdi drain adapter, you could do that and build up a mud bed over what you have.

[bishoy takla]

I think I am going to remove the morter bed and start fresh with a Kerdi pan... will I still need the adapter? Any thing else I should be aware of?


Thanks in advance.

[Kman]

If possible, I would cut the drain out and stub up 2" PVC for the kerdi drain. Do you know what kind of plumbing you have?

[bishoy takla]

A follow up question to the expert... should I consider a Kerdi adaptor on this flange and raise the floor with self leveling/ foam board to recieve a Kerdi Pan?
Or
Should I keep chipping the concrete under the flange and replace it with a Kerdi drain?



I am not sure what material is my plumbing, I wanna say it is PVC but I can't tell from what I see. The house is in Dallas and built in 1984

[ss3964spd]

The top drain flange appears to be cast iron, but maybe the pictures are deceiving. Regardless, I don't think my eyes are being deceived by the what is in the drain itself - is that a massive amount of calcium build up?

You might be looking at demo'ing the concrete all around the drain so the entire thing can be replaced, the trap included.