i’m laying ceramic tile down, but I have gypcrete for the floor, do I need to lay down a sub-floor?
May 25, 2009
Posted in How To Lay Ceramic Tile
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May 25th, 2009 at 8:08 am
If you have Gypcrete, and it's not cracked, it will work fine as a sub base for ceramic. You will want to check the floor with a 10' straightedge and make sure there are no ridges or dips of more than 1/8". If there are, use a latex floor leveler first. Should work well for you. Good luck.
May 25th, 2009 at 8:08 am
Yes, you do indeed. How well that sub floor is put down will depend on how well the tile floor will hold up.
May 25th, 2009 at 8:08 am
the floor has to stiff
May 25th, 2009 at 8:08 am
Wow thats an old brand/trade name.
First of all you might want to know the substrate under, the stability of that, and the condition of it currently. The link below certainly defines it as a stable compound, even additionally to regular concrete.
I think it's likely this is not over anything but concrete as in a slab, and cannot imagine why it was ever added anyway. It would make little sense to do it over wood substrate, especially on an upper levels of a structure.
Certainly you can install concrete backer board over but that seems like a possible overkill to me.
I tile every day of my life, and no offense, but so many askers seem to think they need to go excessive.
Steven Wolf
Just my two "sense"
http://en.wikipedia.org/wiki/Gypcrete
May 25th, 2009 at 8:08 am
Define gypcrete – if the floor is as solid as concrete and is relatively smooth then no.
If when you jump up and down on the floor it moves then yes you need a sub floor of 1/2" cement board that is cemented down as well as screwed down to the sub floor. The seams should be taped and smoothed with one coat of thin-set (cement mortar mix especially designed for thin layers).
If there is any movement in your floor then the grout lines may crack. The more the movement the more likely the grout lines (not to mention the tile) will crack.
NOTE: if the floor moves when you walk across it you should consider reinforcing the entire floor structure before installing ceramic tile. It weighs a lot. I have never regretted the ceramic tile floors I have put in my house or elsewhere.
May 25th, 2009 at 8:08 am
go to your local lowes or homedepot. go to the tile dept and ask for a producy called hardyboard. it'd made for homes that do not have a solid foundation. trust me it works.
May 25th, 2009 at 8:08 am
I'm not sure what its called but its a liquid and drys as a rubber membrane that will move with the floor and not allow movement to transfer through to the new floor