How do I know when installing concrete board whether to put the rough side up or down???? Thanks for any help you can give me with this. Sheila
It really does not matter which side you set on. Most of the time the smooth side is used on floors and the rough side on walls for a little better grip on the tile. How you go about installing it is much more important. Where are you using it?
I am using this for a bathroom floor and then plan to put tile over it. Thanks for your advice. Sheila
When installing the cement board, use thinset under the board. Comb it with a 1/4" square notch trowel, set the board in the thinset and then use galvanized roofing nails or backerboard screwsd to hold down the cement board. The thinset under it is only there to fill voids caused by unevenness between the plywood and the cement board. After the boards are set use a mesh tape over the seams and coat with a smooth, thin layer of modified thinset that you will use to set the tile.