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dmack7 01-16-2012 06:49 PM

underlayment height
hi, I'm new to the site and a reasonably new diyer. i just laid porcelin tile in the basement. a friend just asked me to help him redo a bathroom. my only real concern is what i will find after i bust up his current tile in this older house on the floor and if the height wont match the height of the adjacent carpeted hallway. ditra sounds like a possible solution but the question is can i use a 1/4 inch cement backerboard or does it have to be 1/2 inch backer, thanks!

ratherbefishing 01-16-2012 07:18 PM

1/4 inch is standard for floors.

dmack7 01-16-2012 07:29 PM

thanks for the quick response! i like this site!

rusty baker 01-16-2012 08:05 PM

I hope this bathroom is on a wood subfloor. Backerboard should not be used on concrete.

dmack7 01-16-2012 09:15 PM

that was my next question, i remember helping my dad bust up several inches of concrete in a bathroom floor in a house of similar age.. i guess if i run into that i have to get some self leveler then thin set and then ditra?

JazMan 01-16-2012 09:37 PM

You're not gonna find a wooden substrate in the basement. (hopefully). No concrete board will be used on a concrete floor. Ditra, on the other hand, may be a smart move.


dmack7 01-16-2012 09:47 PM

sorry for the confusion, i recently finished my basement, the bathroom i will be helping my friend with is on his 3rd floor

JazMan 01-16-2012 09:59 PM

OK so, the reference to basement was not relevant. :thumbsup:

So tell us about how your friend's floor is constructed.

The goal should not be to have the different floor match in height, but rather installed correctly so it'll last. Usually tiled floors need to be thicker.


dmack7 01-16-2012 10:15 PM

we start demo this week, im hoping for plywood sub floor but for reference (and knowledge sake because it does interest me to know) say i find iron mesh between an ungodly amount of concrete, which I'm assuming is an old way of doing tile work. in this case, bust out the old tile,self leveler,thin set then ditra? thanks so much for the responses, i enjoy these kind of projects!

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