3

Is there a consequence to using too large a notch trowel, aside from wasted thinset? Asking for 2 reasons:

  1. I'm installing 16x24 tiles on a floor, with 5x5 "accent strip." Both tiles ~10mm thick. But if I use standard trowel sizes (1/2" for big boys, 1/4" for small), the thinset-thickness-difference could cause lippage. So is it okay to use the 1/2" for both tiles? High traffic area in a shared bath, plenty of point loading on those 5x5s.

  2. I'm tiling a shower with Kerdi Board. Before I installed the Band, my walls were dead plumb & flat -- but not now, thanks to buildup at overlaps (e.g. around niches). IMHO, I installed it perfectly, using All-Set, with no excess thinset. There is clearly lippage if I dry fit a few 6x12 wall tiles. I was gonna use a 1/4" notch here... what if I use a 1/4" x 3/8" notch instead? Or maybe a leveling system? In lieu of floating the whole thing... These are not the flattest 6x12s I've ever seen... Thanks!

2
  • 1
    I notice that you have many unresolved questions. Please take the tour so you know how to use this site well.
    – isherwood
    Nov 14, 2022 at 21:43
  • Got it, thanks isherwood!
    – borisj
    Nov 15, 2022 at 15:14

1 Answer 1

7

No one I've ever worked with changes trowel size mid-floor. Use the larger notch throughout. If you find that the smaller tiles are sinking in further, back butter them with the 1/4" trowel so there's more mortar under them. In all cases be sure that edges are well supported.

Regarding #2, use whichever trowel gets you good results. Tiling is an art, not a science. As long as every tile is well bonded and supported, it's fine.

2
  • 2
    Thanks for the perspective. I'm a framer, and have so many experiences of ending up terribly off on Step 25 because I was 1/16" off on Step 2... so I'm really paranoid with tiling.
    – borisj
    Nov 14, 2022 at 21:20
  • 2
    That's a good mindset. Preparation is crucial.
    – isherwood
    Nov 14, 2022 at 21:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.