Hello all,
I will be tiling a bathroom with a floor that slopes approximately 1.5″ over 11 feet. Because of this slope, the bottom edge of the level bathtub at one end is raised about 3/8″ above the subfloor (see image). I am wondering how to deal with this gap between the tub and subfloor — it is higher than the thickness of the tile, so I am concerned that it will both look bad and be difficult to make waterproof.
A couple of notes:
1. It isn’t feasible to level the subfloor because doing so would create an unsightly and unsafe tripping hazard at the threshold to the adjacent bedroom floor.
2. The subfloor is 3/4″ Advantech and I will be using Ditra underlayment.
My initial thought is to apply a layer of 1/4″ plywood over the Advantech to reduce the gap enough for the tile to look right against the tub. That solves the aesthetic problem. But how can I seal the gap to keep it waterproof?
I look forward to any suggestions you may have.
Thank you!
Replies
Plywood just moves the problem.
You may want to consider a floor patch and feather finish product under the ditra.
Level is simpler to handle, and makes the tile job more straightforward, so keep that in mind. If your planned tiles are on the small side, this would work best.
Thank you!
What is the preferred sealant where the Ditra meets the edge of the tub?
Are you tiling directly to the Advantech? Why not use a Durock or other tile backer that would both close the gap but serve as a decoupling layer. I've done quite a few projects over the years using Durock underlayment with tiles (on new and renovations) and never had a failure (i.e. a crack or popped tile).
couple of thoughts -
if you're down to the subfloor, could you pull off the subfloor and then cut angled 2x pieces to fasten to the framing to get a more level surface (?), or sister level 2x stock to make the surface level
then re-install the advantech
self leveling cement could resolve your situation - as previously suggested, use various thickness of tile backer to build up the space if needed or just mix up the self leveling cement and let it flow - just be sure to seal any penetrations
good luck
Have you considered Ditra XL, (5/16") and kerdifix caulk at the tub?