The easiest, fastest way to build a curbless, level-entry shower is with an ARC shower base. Installing this shower former and waterproofing typically takes one day. With a TrueDEK shower base you avoid all the difficulty and risk of notching, lowering, or altering the joists. ARC TrueDEK shower bases take away all of the guesswork and make building a shower so much easier. This base must be installed so the drain gulley hangs between joists. This shower base is 7/8" thick at the edges. Cover this base with tile or stone (from 1/" to 1" thick); this base can also be covered with commercial, weldable vinyl flooring. To build larger showers use ARC pitch extensions or appopriate mortar products or install TruDEK shower base side-by-side. Install TrueDek bases on any type of joists, on subfloor, or concrete. To complete your shower installation you will need and ARC waterproofing kit and a drain assembly for tile (chose a drain for vinyl only if you instal weldable vinyl flooring. Tile that is 2" x 2" or smaller conform to the pitched contours of this shower base; for tile larger thant 2" x 2", make valley cuts so that the tile lays properly on all pre-pitched surfaces. When installed properly on joists, all TrueDEK Classic bases support 800 lbs. or more. This product is covered by the manufacturer's limited lifetime warranty.