im using a cement backer board why do i need a scratch coat and mesh?
Sounds like belt and braces to me.
if its backer board, u can decrease it with a razor knife, if its Dur-rock( cement board) moist the area of the board first after marking the line with a pencil, and then decrease , will decrease down on the dirt. hint: get a field or floor fan and factor it with the intention to blow the dirt far off from u! lic. gen. contractor
I don't believe you do need the scratch coat or the mesh if you're applying to cement backer board. If my memory serves me correctly that's the idea of cement backing board... to eliminate the extra work.
More info is needed, but if on the wall glued and screwed to the studs you will not need anything else. (backer-on screws ) help because they countersink themselves. On A floor application the minium substrate suggested is 1 1/4 inches total, but I NEVER use less than 1 1/2 inches combined. Plywood only I do not use OSB board for tile at all. If using Marble tile or large 12x12 or larger tile, there can not be flex in the floor because grout will pop, and crack and the tile or Marble will not hold up. Thicker is certainly better. I also install cement board with thin-set over plywood nailed and screwed to secure. I have never used a scratch coat with cement board, I would just use the true mud base if needed. I hope this helps you, but please give more info next time. SO normal tile installations with cement type adhesive ( thin-set )
