Why should I apply thin-set mortar to the subfloor before putting down DensShield® tile backer?
Many of our customers feel as long as they are using mechanical fasteners such as nails or screws to fasten DensShield tile backer to a sub-floor, that applying thin-set mortar is a superfluous step. This is not true. The application of thin-set over plywood eliminates any air gaps between the subfloor and the back of the DensShield panels. If this step is not completed, air gaps could cause movement and crack the grout lines or tile.
