![]() A prefabricated pre-slope device simplifies this task, but if a mortar bed pre-slope is floated, it must have the correct and consistent slope without even slight humps or valleys that could impede flow, and it should be bonded to the substrate with modified thinset mortar or a cement slurry. The pre-slope must have a uniform slope of ¹/₄ inch per foot (20 mm per meter) (2% slope) to the drain. The pre-slope sets the slope of the entire shower assembly, so it is critical that it be accurate. Installation of Pre-SlopeĪ shower’s ability to direct water to the drain relies on the slope of the finish tile. The B415 shower is currently one of three shower types that form the basis of the tile industry’s Advanced Certification for Tile Installers (ACT)². While a comprehensive analysis of shower receptors is out of this article’s scope, it will examine one specific shower, the TCNA B415 shower¹, and this shower’s critical points of design and installation. A qualified tile setter should be able to install any type of shower to exacting performance criteria. Is the bottom of the backer board on the shower walls buried in the mortar bed or it is elevated above the top of the mortar bed?Ī few commonly specified shower assemblies that address each of these variables appear in the TCNA Handbook for Ceramic, Glass, and Stone Tile Installation, but there are also many variations of successful showers that do not appear in the Handbook.bonded to the top of the finish mortar bed)? Does the waterproofing take the form of a sheet pan liner or a liquid? Is it sandwiched between the pre-slope and the finish mortar bed or it is topical (i.e.Does the shower have a curb at the front to contain the water or is it curbless for wheelchair accessibility?.Is the slope in four directions to a centrally located drain or in one direction to a linear drain?.Is the slope to drain provided by a mortar bed or a prefabricated “pre-slope” mechanism?.Is the water directed to a conventional drain with weep holes via a “water in, water out” approach or to a flanged drain via a single line of defense approach?.
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