TI-PROBOARD UNDERLAYMENT FOR TILING OUTDOOR DECKS• •  4 Pieces • • Size of Each Piece: 12" X 95" X 0.375"TI-ProBoard is the base of a unique system to form a solid tiled surface to new or existing floors.TI- ProBoard, underlayment boards for outdoor tiling installs directly to deck joists to provide a stable 3/8 in. substrate for installation of tile rather than traditional decking boards. Easy for home owner or professional installer, TI-Proboard prepares the deck surface for setting materials and tile installation. Tile the entire deck surface, a walkway, or insert a pad for grills and fire pits to help prevent stain or harm to the deck"™s surface. Enjoy stylish outdoor solid surfaces that are durable and easy to maintain.INTERIOR USE - TI-ProBoard can applied straight to the floor joist then tile (total thickness is less than 1 inch when using a standard tile. Making the transition from room with carpet to tile almost seamless (carpet will be on a plywood) compared to the standard tile installation of (plywood, subfloor, tile) which would be higher that a carpeted room and would require a "œstep up"� to the tile areaTI-ProBoard is an anti-fracture material to protect the tile and is placed over plywood, (plywood will have failures)TI-ProBoard is a structural material so there is no other plywood, backer boards etc.No special tools are required. When your deck is finished there is a dry area underneath for storage.The smallest tile that can be used - 6" x 6"The weight per sq ft. of all components - Dead weight around 8 lbs. sq ft".In accordance with the Performance - Level Requirement Guide of the 2003-2004 Handbook for Ceramic Tile Installation, the installation is rated as "œEXTRA HEAVY"� suitable for use in dairies, breweries, etc.Fully loaded TI-ProBoard (i.e. mortar, thin-set, Porcelain tile, and grout.) is 8lbs of dead weight per square footTI-ProBoard warranty - 10 years