I am laying tile in my bathroom and plan to lay durock over my 2x6 sub flooor...?

Question

I want to put thinset in between the durock and the subfloor, fastened with backerboard screws. Is that okay, or do I need a layer of plywood in between the 2x6's and the durock???

Answer 1

You need at least 3/4" plywood or OSB as an underlayment on top of the floor joists. You must have thinset between the underlayment and the backerboard and between the backerboard and tile.

You don't want the tile floor to flex at all...ever. Flexing will break the joints or tile, and that is not good.

The underlayment will provide a good solid base for the backerboard, but the thinset will fill in any voids, that is important.

Backerboard alone will flex and break.

Be sure to use screws that are designed specifically for backerboard.

Answer 2

You need to put down a sub flooring. It comes in 4x8 sheets and isn't very expensive.

Answer 3

You want it as strong as possible so you should have a plywood sub-floor under the durarock but it's not necessary to put it down with thin-set under it.

Answer 4

you need plywood for subflooring .the 2x6 are joists , the plywood subflooring  and duorock for setting the tile

Answer 5

why think set so it don't leak down stairs i worked in construction and we used like a painted roofing coat that used to put on the floor so they wouldn't leak we used two thick coats it gets paint on so its easy try that it might work

Answer 6

  You can do it on the 2x6 planks.. Since their on a diagonal ( I assume) you do have to make sure all your screws hit them.  s***w down any planks that need them.. Those  old houses like that I ve seen some planks become loose over time.. You do have to be carefull of the thin set leaking area below..If there are any big gaps in the wood a sheet of 1/4 or maybe 3/8 ply might be a good idea although  I ve never had a problem..Anything thicker and you may run into heigth (sp?) problems for stool and  tripping  in the doorway  GL

Answer 7

You definitely need to have a sub floor under your tile. You buy it in 4x8 sheets and it should be flooring osb or plywood. It is 5/8 or 3/4 thick to properly support. You have to keep in mind that tile is very heavy and if the floor flexes the grout will crack. You also do need to lay thin set under the Duroc or hardy board to avoid any air gaps that will also allow the floor to flex. Also 2x6 seems pretty undersized for floor joist in the first place so you definitely want to go as thick as you can for the sub floor. It is worth the effort and $$$ to to a project as well as you can so you are able to enjoy it in the future.