My fear is that I will trap moisture where it shouldn't be. Is there such a thing as overkill?
Tile council of America calls for a vapor barrier behind the cement board ..The red guard your talking about should and must be used on any horizontal surface in a wet area.. There are other agents like red guard but I v used it many times and had great luck w/ it..Making sure the proper pitch is used for the horizontal surface GL
May 11, 2017