Floors, Interior - Ceramic or Porcelain Tile

• maximum spacing of joists, I-joists, or floor trusses is 19.2" (488 mm) o.c.
• minimum subfloor thickness – 23/32", 3/4" nom. (19 mm) tongue-and-groove with 1/8" (3 mm) gap between sheets

Substrate Preparation

• verify that subfloor panels are properly fastened to framing members
• any leveling of the subfloor must be done prior to installing Schluter-DITRA

Movement Joints

• Schluter-DITRA does 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

Other Considerations

• tightly butted and/or tented plywood or OSB seams must be addressed prior to installing Schluter-DITRA
• vapor barrier on crawl space floors according to regional building codes
• where a waterproof floor is required, all Schluter-DITRA seams and floor/wall transitions must be sealed with Schluter-KERDI-BAND using unmodified thin-set mortar; see waterproofing requirements for more details