Mapei Ultraflor Plus Gray Mortar for Large and Heavy Tile is a 50lb bag of polymer-modified, large-and-heavy-floor- tile mortar and thin-set mortar for interior/exterior floor applications of large-format and heavy tile/stone. It is used to install porcelain tile, heavy ribbed-back tile, brick pavers, dimensional tile and natural-stone tile.FEATURES AND BENEFITS•Nonslump for large-format and heavy tile/ stone•For thicker bond coats from 3/32" to 1/2"•A smooth and creamy consistency makes Ultraflor Plus easy to apply.WHERE TO USE•Most interior/exterior residential and commercial installations on floors •Installation of ceramic tile, porcelain tile, quarry tile, brick pavers, Saltillo tile, dimensional tile, and most types of marble, granite and natural stonePrior to beginning your project, please consult the manufacturer's installation guide