I just finished cutting and fitting 22 sheets of durock,in three different areas in my own home. I have searched the archives and find conflicting intallation procedures. some say thinset and screw others just screw or nail. This is a new addition with 3/4 T&G glued down. The question is should I pull it all up and use thinset or just go ahead and screw it.
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What?
Is the finished floor t&g wood? Why would you put durock under that?
If you are installing tile, then the durock should be bedded in thinset and then nailed/screwed in place. I use screws.
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt
Bed the durock in thiset. Un modified. That is the answer.
Yes, and then screw it off.
Absolutely. Or nail it.
The manufacturer's instructions for Wonderboard call for modified thinset under the board. Beats the sh!t out of me as to why unmodified wouldn't be good enough.
First, most manufacturers list thinset as the setting bed for their products. They also list the method of fastening and type of fasteners to be used. With that said, and I don't know the manufacturer, I suggest you check with them. Most have web sites and list their 800 #'s. Best bet is to get it straight from the horses mouth. You mention 3/4 T/G, is this boards or ply. etc. Experience tells me if boards, they will require a layer of ply before the cement board. Hardibacker lists this in all their literature. I know for a fact, if you go against their and the industry recommended standards, there is no warranty. Just trying to save you grief.
Thanks for the input. It is t&g ply didn't think it was nessesary to stipulate. I will be a thinsetting fool tommorow. Thanks again
Mix the thinset just a little wet. You want it to ooze when the screws are tightened. It fills all the little voids under the durock and provides 100% support.
"When asked if you can do something, tell'em "Why certainly I can", then get busy and find a way to do it." T. Roosevelt