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Shower Waterproofing

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Valid Concerns or No?

Hi all! Need some insight and opinions, please. I'll introduce myself as probably a contractors worst nightmare simply for the fact that I love to learn how things are done, so I spend a lot of time researching which leads to a lot of questions for him. That being said, I'm in the midst of a huge project that involves 2 baths and a basement under contract with a GC. These 2 baths have been completely gutted and floorplans revised to better fit our needs which included all new plumbing and electrical. We're finally to the point of putting everything back together and I'm afraid its gone sideways and heading to disaster. I am panicking and need to decide whether to ride it out or stop all work when everyone comes back after new years. I have no idea what kind of "system" the contractors want to call this nor…


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Larry S
yesterday

He's been doing it wrong for 10 years. It's just sub par work. Do it fast, get it done. No concern for correct.

You definitely need a 3rd party. Call another tile contractor. Let him come over and get a few laughs in. If it's really a problem I'll give you my phone number. I'm not shy about telling people they do terrible work

Luis Zayas
Luis Zayas

Hairline cracks in Keraflex skim coat & Window Sill Waterproofing

Question 1: I did a dry pack mortar bed over my concrete floor and used a layer of thinset (MAPEI Keraflex Plus) over the top to fix some slope imperfections. While the slope is now as good as I'll ever get, I have noticed some hairline cracks in the cured thinset (I doubt I could even fit a piece of paper into them). Will this be a problem, or can I go ahead and continue with the liquid Hydro Ban?


Question 2: I sloped the cement board on my window sill using thinset, but I need to know the best way to waterproof the transition to the window frame (it will see plenty of water). The end state is a long composite sill tile on top. Is it okay to use Laticrete Hydro Ban Adhesive & Sealant where the cement board meets the window? I plan to apply it like…


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Larry S
Dec 29, 2025

Sorry for the late response. But yes to all your questions. You're going overboard and that's good. We use the sealant along the window frame. Adding extra waterproofing is always good. Just be careful of build up

Edited

I waterproof with liquid membrane and water stop angles in the shower recess. What do you think?

ree

217 Views
Larry S
Nov 24, 2025

Looks solid. And going overboard like that ensures the ONLY reason they call you back is to do ANOTHER bath for them

waterproofing for alcove tub

New to the DiY world!!! Going to attempt to renovate small bath. Doing lots of research and have the help of a friend, which is nice. I'm trying to figure out the best and cost effective waterproofing for the alcove tub surround for a tile job. I'm thinking of going with GoBoard to due cost and ease of use from what I have seen. Though I have seen some test that show there can be seepage/absorption. For context I live in AK and materials can be limited or cost a fortune to get up here. My options for the most part are GoBoard, keridi, cement board, or Densshield. Thoughts?

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Isaac Ostrom
Isaac Ostrom
Nov 16, 2025

Go Board is good, just a little itchy.

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