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Old 01-25-2010, 02:00 PM   #1
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Ditra on slighty uneven subfloor


I had to replace a section of subfloor in my bathroom. I am going to be installing 12x12 and 6x6 tile for the floor. After installing the new subfloor The new section of the floor is about a 1/4 inch higher than the old floor. Not sure why b/c i pulled out 2 pieces of 3/4 inch plywood and replaced it with the same. What do i do to level this part out. I am going to use ditra as a backer. Can i double up the ditra where needed or use thinset to level under the ditra? please Help! Dont want to do it wrong and have my expensive tile crack later.
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Old 01-25-2010, 03:00 PM   #2
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Ditra on slighty uneven subfloor


You have a problem--The easy fix is to remove your patch and figure out why there is a height difference.

I'll bet your patch wood is thicker than the old floor. Is removing the entire subfloor in that room an option?


Filling a low spot is easy enough--Leveling a high spot is NOT.

Don't use firmset as a leveler for an area that size--the finished work will be like a roller coaster.

Doubling your membrane as a leveler (at $1.80 per sf) is a funky fudge job--

You want this right--start with a flat floor. Good luck-have fun--Mike--
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Old 01-25-2010, 03:10 PM   #3
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Ditra on slighty uneven subfloor


i was thinking of replacing the entire subfloor but i can only get a skill saw so close the the walls. how would i go about cutting the rest out right up against the wall. could i use a sawzall? If so, how do i keep from cutting too deep into my floor joist.

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Old 01-25-2010, 03:29 PM   #4
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Ditra on slighty uneven subfloor


The new subfloor will be thicker than the old one.--The low spots can be filled with firmset when you tile or set your membrane.

You can make safe shallow cuts with your sawsall by putting the blade in UP SIDE DOWN-use a long blade and you can make shallow cuts without nicking the joists. Screw blocking to old subfloor-to support the new.

Remember--it's easy to fill a low spot! High spots are your enemy--HaHa---mike
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Old 01-25-2010, 07:09 PM   #5
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Ditra on slighty uneven subfloor


If the difference is truly 1/4", then cut some pieces of 1/4" underlayment to be added to those low spots.

Beats the heck out of puling up the entire floor!
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Old 01-25-2010, 07:10 PM   #6
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Ditra on slighty uneven subfloor


Forgot to add.......

And if its just a bit more than 1/4", use 1/4" ply and some builders felt as shims -- double or triple layers as needed to make up the difference.
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Old 01-27-2010, 10:51 AM   #7
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Ditra on slighty uneven subfloor


Remove the patch and do it again using the proper material thickness this time. All those other cement type patches will only cause issues down the road when things try to expand and contract and crumble down below.
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