100+ Free Shower Receptors Practice Questions

The ACT Shower Receptors exam covers seven core areas: (1) TCNA B415 method (pre-slope, pan liner, top mortar bed, two-stage drain); (2) IRC P2709 code compliance (curb height, slope, watertight drain); (3) drain types and weep hole protection; (4) pan liner installation with dam corners; (5) pre-slope construction at 1/4 inch per foot; (6) top slope mortar bed (1-1/4 inch minimum thickness, 1/4 inch per foot slope); and (7) curb construction with wrapped liner and metal lath. The written exam is 25 questions at 84% passing; the hands-on field assessment is at 85% passing.

Eligibility requires one of two paths: (1) hold an active CTI (Certified Tile Installer) credential from CTEF, or (2) achieve the rank of journeyman tile setter through the International Union of Bricklayers and Allied Craftworkers (IUBAC) apprenticeship program. The CTI prerequisite ensures candidates already have verified general tile installation knowledge before specializing in shower receptors.

Both the pre-slope (under the pan liner) and the top mortar bed (over the pan liner) must slope at 1/4 inch per foot (approximately 2 percent) uniformly to the drain. The pre-slope is critical because it tilts the pan liner itself toward the drain, allowing water that reaches the liner to flow through the weep holes. The top mortar bed maintains the same slope to drain water visibly off the tile surface.

ANSI A108.1A-2.3.6 and the TCNA Handbook call for a minimum top mortar bed thickness of approximately 1-1/4 inch (and not less than 1-1/2 inch in some specifications, or as required by local plumbing code) measured at the perimeter of the receptor. The bed must be thick enough to maintain the 1/4 inch per foot slope to the drain without exposing the pan liner or causing depressions that would impede water flow.

Inside corners (where two walls meet) are folded, never cut — cutting the liner there would create a leak. The liner is creased and folded flat against the wall, and any excess is contained behind the eventual wall finish. Outside corners (typically where the curb meets the door jamb) require preformed PVC or CPE dam corners adhered with manufacturer-approved sealant compatible with the liner chemistry. Adhesive seams or sealant — never just mechanical compression — are required for any cut edge.

Weep holes in a two-stage drain barrel are protected with one of three methods: (1) a manufactured weep hole protector (a plastic dome that fits over the drain barrel and keeps mortar away from the weep openings); (2) pea gravel placed around the drain collar to fill the space without sealing the holes; or (3) a fine screen wrapped around the drain barrel. Without protection, fresh mortar packs into the weep holes and seals them, trapping water on the pan liner and producing the characteristic 'never-drying' failure mode.