PS42 XLT—ANSI A118.11 Extra Large Format Tile Mortar

PROFLEX® PRO-STICK 42 XLT is a one step polymer modified portland cement setting adhesive for installing extra large format porcelain, ceramic tile and natural stone on both walls and floors. PRO-STICK 42 XLT with its unique properties can be used as a thin or medium bed setting adhesive for installing large format, ceramic, porcelain and irregular thickness stone without the need of back buttering the tile.


  • One step application
  • High performance adhesion for porcelain tile.
  • Suitable for interior and exterior applications
  • Use as either a thin or medium bed
  • Exceeds ANSI A118.11 EGP for Latex Portland Cement Mortar

Typical Use

PRO-STICK 42 XLT is ideal for use in installations of extra large oversize ceramic tile and natural stone for both walls and floors in both interior and exterior applications. It is recommended for use for absorptive, semi vitreous, vitreous tile and impervious ceramic tile such as porcelain tile and natural stone over properly prepared masonry, concrete, cement backer board, membranes and existing ceramic tile. For interior dry areas, it is suitable for properly prepared gypsum board and exterior grade plywood substrates. PRO-STICK 42 XLT is suitable for both residential and commercial construction. It is recommended for use in the thin set installation method for vitreous tiles like porcelain over low or non-absorptive subfloors, and membranes.

ANSI 118.4 ANSI Requirements PS 24 XLT Results
Glazed Wall Tile, 48 hour shear >100 psi >260 psi
Impervious Mosaic, 28 day shear >200 psi >480 psi
LEED v3 NC VOC EQ Credit 4.1 PS 42 XLT Results
VOC <65 g/l 0 g/l
1/4” x 1/4” Square, 65 – 75 sq. ft. Ceramics, 1/2” x 1/2” Square, 55 – 65 sq. ft. Quarry Tile, Rough Stone, 1/4” x 3/8” Square, 35 – 45 sq. ft. Large Tile, Marble, Stone
Suitable Surfaces

Brick masonry, Cement backer board(1), Cement mortar beds, Cement plaster, Cement terrazzo, Ceramic tile and stone, Concrete, Concrete masonry, Cutback adhesive(2), PROFLEX® Membranes, Existing tile, Post tension, Vinyl composition flooring(2)


50 lb. bag (22.7 kg.); 48 bags per pallet