Shower Receptors flashcards

32 cards. Read the term and the definition here. The deck at the top of this page is optional.

Shower receptor definition

The waterproof, sloped floor assembly that receives shower discharge, either site-built from mortar and membrane or a prefabricated pan.

Preslope definition

The sloped mortar substrate placed beneath the waterproof membrane so water reaching the membrane flows to the drain.

Weep holes definition

Openings in the drain flange that let moisture trapped in the mortar bed migrate into the drainage system instead of accumulating.

ANSI A118.10 membrane

The consensus standard used to evaluate load-bearing, bonded waterproofing membranes such as sheet and fluid-applied products for shower receptors.

Code shower floor slope

Model plumbing codes commonly require shower receptor floors to slope a minimum of one-quarter unit vertical per unit horizontal toward the drain.

Clamping-ring drain

A drain with a lower flange on the preslope and an upper ring that clamps the membrane in place, with weep holes kept open.

Bonding-flange drain

A tile-in drain whose flange the waterproof membrane bonds to directly with manufacturer-approved adhesive, without a clamping ring.

Subfloor deflection limit

The tile assembly method sets a minimum stiffness, often L/360, that the framed floor must meet before receptor and tile work begin.

Drain height rough-in

The drain body is set so its flange sits flush with the preslope surface at the drain, letting the required slope terminate cleanly.

Curb framing requirements

Solid or built-up lumber secured to the subfloor, with the top sloped toward the drain and no fasteners driven through the membrane's horizontal plane.

Rough plumbing test

A hydrostatic or air test of the drain line and trap completed and documented before walls close and the preslope is placed.

Perimeter blocking purpose

Stud blocking at the receptor perimeter supports membrane terminations, curb framing, and backer-board edges so the assembly stays rigid.

Dry-pack preslope mix

A sand-and-cement mortar, commonly about four to five parts sand to one part cement by volume, placed at the required slope.

Preslope thickness rule

Maintain at least about three-quarters of an inch at the drain and increase thickness at the perimeter to hold a uniform slope.

Prefabricated pan setting

The pan is bedded in mortar or adhesive per the manufacturer, leveled at the perimeter, and checked to slope toward its factory drain.

Final mud bed thickness

The mortar bed above the membrane is typically at least one and one-half inches at the drain and follows the preslope's slope.

Linear drain leveling

The channel body must be level, with the grate height matched to the finished tile thickness and slope checked perpendicular to the channel.

Membrane wall height

The waterproof membrane extends continuously up the walls a minimum of two inches above the curb, or higher if the manufacturer requires.

Curb flashing rule

Membrane laps over the curb and terminates on its outside face, with fastener penetrations permitted only above the finished flood level.

Sheet membrane seam overlap

Seams overlap per manufacturer instructions, commonly two inches minimum, embedded in bonding adhesive and rolled to remove air pockets.

Corner reinforcement

Inside and outside corners receive pre-formed corner pieces or folded membrane reinforcement per the manufacturer's written instructions.

Flood test procedure

Plug the drain, fill to at least one inch above the highest receptor point or to the curb top, mark the level, and hold per specification.

Wet-area mortar coverage

Wet-area floor tile requires at least 95 percent mortar contact, achieved with proper trowel notch, back-buttering, and full embedding.

Movement joint sealant

Changes of plane and perimeter joints use an ASTM C920 sealant rather than grout, following TCNA movement-joint guidance.

Drain grate height

The grate or strainer sits level with or slightly below the surrounding tile, is secured, and remains removable for cleaning.

Curb top tile slope

Curb-top tile slopes slightly toward the drain side and is bonded without fasteners that penetrate the waterproofing beneath.

Pre-membrane inspection

Before membrane work, verify preslope slope, drain height, blocking, and substrate condition, documenting findings with photos and a checklist.

Flood test pass criteria

No water-level drop beyond evaporation allowance and no visible leakage at penetrations or below the membrane constitute a passing membrane test.

Test record contents

The flood-test record captures test date, water depth, hold duration, and inspector name for the project's quality documentation.

Weep hole verification

After tile and grout, confirm weep holes remain open and water drains freely at the receptor during final inspection.

Leak source isolation

Determine whether leakage comes from the membrane, drain flange, weep holes, or plumbing before demolition, using a flood test to confirm.

Silica dust protection

Cutting mortar and tile requires wet methods or dust collection plus respiratory protection to limit respirable crystalline silica exposure.