Heated Floors, Interior - Tile or Stone

*** Essential
**   Significant
*     Helpful

Requirements

• for wood substrates, subfloor/underlayment configuration according to details for 16" (406 mm) o.c. joist spacing 19.2" (488 mm) o.c. joist spacing 24" (610 mm) o.c. joist spacingNatural Stone

Substrate preparation

• any leveling of the assembly must be done prior to installing Schluter-DITRA and Schluter-DITRA-XL
• additional preparation according to the manufacturer's directions

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 placement of movement joints for more details

Setting and Grouting Materials

• latex portland cement (p.c.) mortar – ANSI A118.11
• 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
• heating system – follow manufacturer’s directions

Other Considerations

• vapor barrier on crawl space floors according to regional building codes 
• 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