I'm replacing some broken hardware, like mixing valves, in my master shower built in 1994. Currently, there's just drywall behind the tile. I've heard conflicting opinions from contractors about whether I can do a partial tile replacement and still achieve a waterproof surface. Some contractors say it's fine to replace just the broken tiles, while others insist that proper waterproofing can't be achieved without tearing everything out. I'm hoping to install vertical strips of mosaic tile along the plumbing fixtures. What's the consensus here? Is it possible to waterproof the shower if I only replace part of the tile? If so, how should I go about it?
5 Answers
What waterproofing solution do the contractors plan to use? That's a key part of this discussion.
The other contractors are right. You can’t properly waterproof over existing tiles because you'll just butt against them. To really ensure no leaks, you should take everything down and redo it. Otherwise, you might end up with moisture in your walls.
Thanks for your input! It seems like a total redo is the way to go.
Schluter Kerdi is also a great option for waterproofing! If you're looking for a reliable solution, that's definitely something to consider.
Got it. They used something similar in my guest bathroom during a remodel, so I'll check back with my contractor about that.
As a pro, I can say it’s technically possible to replace sections of tile, but it's risky. A contractor won't warranty a partial fix since it could still leak. You'd need to ensure proper waterproofing, but overlapping coverage is tough with existing tiles in the way. Honestly, if you're after a guaranteed fix, you might need to redo the entire shower.
Yes, looks like the consensus leans toward a complete redo. Such a waste of tiles, but maybe I'll keep them for a future mosaic project!
I wouldn't recommend trying a waterproof patch. The edges need to be spot-on, and drywall isn't a valid substrate for tile. Instead, using something like cement board with an elastomeric coating, like Red Guard, is a solid budget-friendly option.
Understood… It's a huge bathroom, and I really didn’t consider how patching might create issues. Appreciate your insight!
That’s exactly what I plan to ask when I see my contractor later this week!