Careful and proper installation is important for ensuring the long-lasting beauty of your Cast Natural Stone. For all exterior applications, required installation includes a scratch coat (also known as cement plaster coating) over a water-resistive barrier. The water-resistive barrier generally consists of two layers of properly applied Grade D paper, which is then covered with metal lath and a mortar scratch coating (cement plaster).
Installation over rigid sheathing:
The metal lath/scratch coating may be applied over structurally sound wall surfaces of plywood, OSB, concrete board or gypsum sheathing, supported by wood or steel studs, and over concrete or masonry walls.