Designing Kitchens and Bathrooms - Bathroom floor prep for travertine
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bmichel
04-04-08, 01:02 PM
I will be starting the floor tile work shortly, and I have some questions. The floor is 3/4" plywood and in excellent condition - no knots, and the joints are tight. The joists are all at the appropriate size and width.
1. Do I have to apply thinset under the 1/4" hardibacker. If so, why?
2. There is 1 high spot almost like a volcano. it comes up maybe 1/16". How should I handle it?
3. A 2'x3' section has a slight slope down towards the wall - maybe 1/4" over that span. Should I try to level it up, and if so, how?
BTW, thanks for all the help. The shower is coming out great.
1. Do I have to apply thinset under the 1/4" hardibacker. If so, why?
2. There is 1 high spot almost like a volcano. it comes up maybe 1/16". How should I handle it?
3. A 2'x3' section has a slight slope down towards the wall - maybe 1/4" over that span. Should I try to level it up, and if so, how?
BTW, thanks for all the help. The shower is coming out great.
HotinOKC
04-04-08, 03:21 PM
You need to see if your current subfloor is suitable for a natural stone by doing a deflection calculation.
Size of joists
Joists spacing
Unsupported span
Natural stone also require at LEAST 1 1/4" thick subfloor made from exterior grade plywood.
After that has been met, you install the hardiback with thinset and screws, or you can get a Ditra type product.
The thinset under the CBU fills in any voids that may be present.
You should not tile if you you have high spot like this. This needs to be fixed, either by ripping up the subfloor and reinstalling, or installing the CBU then pouring a self leveling compound over it.
Size of joists
Joists spacing
Unsupported span
Natural stone also require at LEAST 1 1/4" thick subfloor made from exterior grade plywood.
After that has been met, you install the hardiback with thinset and screws, or you can get a Ditra type product.
The thinset under the CBU fills in any voids that may be present.
You should not tile if you you have high spot like this. This needs to be fixed, either by ripping up the subfloor and reinstalling, or installing the CBU then pouring a self leveling compound over it.