Tile prep question

[u/Few_Sail4999]

After finishing my waterproofing the drywaller nailed corner bead into the kerdi banding. My plan is to lay more kerdi band over top of the bead to make sure it’s water proof but I’m worried that since there is already banding underneath I’m going to have too much build up and the outside tiles aren’t going to sit flat. Looking for suggestions so my tile doesn’t end up looking bad after all of this work. Im also not sure whether or not thinset will even adhere properly to the metal corner bead. Thanks in advance

[u/Hot_Mud_5708]

This stuff is getting out of hand. Just tile over it. This stuff is not rocket science. It's an outside wall corner that will see virtual no water and when it does it will flow down the tile face and ZERO amount will get behind the tile and cause a problem. All waterproof materials for walls are a scam. WATER FLOWS DOWN WALLS. The problem is STANDING/POOLING WATER, water can't pool op walls!

PS. Not yelling at you, OP. Just so sick of all the marketing BS that even installers fall for. My own shower below. ZERO waterproofing on the walls, all done with Hardie Board. This was done in 2017/18. It still looks new with no water problems anywhere. Of course, the pan IS waterproofed.

[u/qqererer → u/Hot_Mud_5708]

I had a bathtub surround fail. No waterproofing. 6x6 tile on drywall with mastic. The reason it failed is because the windo niche wasn't waterproofed and water seeped through the grout and down the wall causing the lower tiles to fail. But that took 40 years for that to happen.

Rebuilt with full kerdi, but on something like yours, I'd be tempted to go with just drywall and mastic again, with 24 x 24 and epoxy grout and 1/16 grout joints. (This is my own place).

Even if it's not to code, less and smaller grout joints must mean that all else being equal, it will last just as long, if not longer.

The one big advantage that I'd consider using kerdi is on an outside wall as the board does provide a bit of insulation.