What do I use to level out with between green board and hardy backer board?

2017-12-14 05:33:27

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.

You can use Thinset 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 had strength and make sure the screw heads are counter sunk properly.

For 1/6 inch i am not sure it is necessary.

While I've not done this on walls, when I did this on floors

  • You can use Thinset 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 had strength and make sure the screw heads are counter sunk properly.

    For 1/6 inch i am not sure it is necessary.

    2017-12-14 06:02:27
  • While I've not done this on walls, when I did this on floors I had to apply thinset before using fasteners to hold the boards down. 1/4" square notch trowel IIRC. Check out the data in your backer board to see what they recommend.

    If they don't recommend anything, I'd just use plain old drywall mud (not spackle)

    2017-12-14 07:18:53