Remodelling small bathroom and took subfloor down to 3/4 planks that were installed on a 45 degree angle. Then installed 3/4 ext. grade plywood with 3" screws and construction adhesive. On top of that I installed 1/4 inch Hardibacker on top of a 1/4 inch modified mortor base and screwed it down with 1 1/4 backer screws. All went fine and I staggered all hardi joints with those in the plywood except in one spot. Where I had to cut out for the toilet flange I used two pieces of plywood to work around the drain pipe. I did the same exact thing for the hardibacker. The floor is solid as a rock and I did leave 1/8 to 1/4 around perimeter of room and between plywood and hardibacker. I plan to tape and mortar the seams with fiber mesh. I am a little concerned about the one seam where I did not stager the joints. I would appreciate any suggestions from personal experience. What are the chances of this causing cracks in tile or grout?
I did screw the 3/4 inch plywood into the joists (treated as if the planks were not even there. The 1/4 inch hardibacker was screwed to the plywood only. I guess I did make a few mistakes...anything worth redoing at this time in your opinion?
Yes I plan to have all seams tapes when the tile is set. Do I need to tape the seams under the bathtub?
When do the other bathroom you can make the cut in the hardi at right angles to one in plywood.
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