Type 1 is a premium-grade, traditional, nonflammable acrylic adhesive for setting glazed and unglazed ceramic and porcelain tiles on walls, floors, and countertops; Used for interior applications only; Excellent grab for tiles up to 12" x 12" (30 x 30 cm); Suitable for most types of glazed and unglazed ceramic and porcelain tile, and ceramic and porcelain mosaics for walls and floors; Use to install tiles up to 6" x 6" (15 x 15 cm) on floors and up to 12" x 12" (30 x 30).