I have a few points where the sheetrock is (already) not level between joints. About 1/16" or so. I will be adding hardy backer board which needs to span this joint.
I want to avoid (obviously) a non-level sub-surface for the hardy backer board and "float out" this section. What material should I use?
Since I am new to doing this, a specific type-of material name would be helpful, though I suppose specific "brand" names are OK as examples. Thanks.
Pictures attached, they show the gap a little bit.
Best Answer
You can use thinset mortar to float the gap. If the difference in surfaces is significant then you will need to float it out on the low side quite a bit.
It does not need to be to pretty but it should be relatively smooth. Use fiberglass mesh tape made for hardy backer on the seams to add strength; make sure the screw heads are counter sunk properly.
For 1/6 inch I am not sure it is necessary.