This detail shows tile laid on cementitious backer unit (CBU) w/ taped joints on a wood subfloor. The tile is adhered using a dry-set or latex-modified portland cement mortar bond coat. The wood subfloor has 1/8″ gap between the exterior glue tongue & groove plywood sheets, and is adhered to the CBU with dry-set mortar. This detail is based on TCNA Method F144.
06.130.0101: Floor Tile - Over CBU on Wood Subfloor