Cement Board

Submitted By
diddlebut
Answers
1 expert, 0 community
Q:

We laid fiber-cement board on the floor (tore everything up, down to the subfloor) , it's in thinset, but the seams won't lay flat and we want to lay 18" porcelain tile on that. How do we get rid of the bumps? Can we put leveling compound on top of the cement board or grind the seams down?