[BigV]

Getting ready to make:

The floor in the bathroom is being rebuilt. I am at the stage of applying the cementboard (Durock) to the plywood. I have read the war stories about using thinset to adhere and/or void-fill the cementboard - plywood interface.

I have chosen the rebel side and will not use thinset between the plywood and the cementboard, in defiance of the Empire (cementboard manufacturers and their pro-thinset propaganda). I will dry fit the cementboard for size/fit, cutting as needed. For example I need to cut a hole in one board to fit around the toilet flange. And the third sheet is bigger than the remaining uncovered floor. I will *fasten* the cementboard very liberally to the plywood underlayment with the appropriate specialty fasteners at 4-inch intervals along the edges and across the field. This, I believe, will draw the cementboard down to the plywood very effectively eliminating any voids between the two layers that could be a crushable space, leading to a tile stress/failure.

Here's my question.

I have the specialty mesh tape and a tub of premixed thinset and I'm considering the need / benefit of taping the edges of the cementboard together (on top, of course).

Your input is welcome.

No pressure, but I'm going to start this particular phase of the process as soon as I have a little to eat then change into my construction costume.

Thanks in advance.