Heated Floors, Interior - Tile or Stone

• slab to be structurally sound
• slab to be free of waxy or oily films and curing compounds (when present, mechanical scarifying is necessary)
• the installation of Schluter-DITRA or Schluter-DITRA-XL and tile can begin as soon as the slab can be walked upon

Substrate Preparation

• any leveling or sloping of the slab or assembly must be done prior to installing Schluter-DITRA and Schluter-DITRA-XL

Movement Joints

• Schluter-DITRA and Schluter-DITRA-XL do not eliminate the need for movement joints, including perimeter joints, within the tiled surface.  Movement joints should be installed in accordance with industry standards and norms; see guidelines for the replacement of movement joints for more details

Setting and Grouting Materials

• unmodified thin-set mortar – ANSI A118.1
• grout – ANSI A118.3, A118.6, A118.7, A118.8

Setting and Grouting Specifications

• tile - ANSI A108.5
• grout – ANSI A108.6, A108.9, A108.10

Other Considerations

• where a waterproof floor is required, all Schluter-DITRA and Schluter-DITRA-XL seams and floor/wall transitions must be sealed with Schluter-KERDI-BAND using unmodified thin-set mortar; see waterproofing requirements for more details
• certain moisture-sensitive stones, e.g., green marble, or resin-backed tiles may require special setting materials. Consult stone supplier and Schluter-Systems for more information