Q: If the plywood subfloor is already in place, what makes a better setting bed for a floor tile installation: backerboard underlayment or plywood underlayment?

A: Veteran tile installer and consultant Michael Byrne, who also moderates JLC’s ceramic-tile online forum, responds: In any comparison that pits 1/2-inch cement backerboard against 1/2-inch plywood underlayment—both properly installed over a 5/8-inch plywood subfloor—the double-layer plywood sandwich wins as the stronger of the two, even though...

or Register to read the full article.