Wet-area evidence register
Specify wet zones, substrates, membranes, transitions, penetrations, testing evidence, fan and duct route, and maintenance records.
Decision file
Label shower or tub areas, floor transitions, walls, niches, benches, curbs, penetrations and adjacent moisture-sensitive materials. Distinguish surfaces exposed to direct water from the rest of the room, and record existing staining or deterioration as an observation that still needs qualified investigation.
Ask how framing, panels, mortar beds, existing surfaces and movement joints are assessed and prepared. The accepted scope should name the substrate at each wet-zone surface, specify allowable flatness or slope checks from the selected system and explain how defects are corrected before membrane work.
List membrane, adhesives, drains, tapes, sealants and accessories plus current installation documents and substitutions. Product names alone are not enough: require the current detail for corners, seams, cure times and drain integration, with written review before a component changes.
Require drawings or photos for corners, changes of plane, drains, valves, fasteners, doors or screens and floor interfaces. Include the doorway or shower-entry transition because water containment can fail at the boundary between the wet assembly and the rest of the bathroom.
Record inspections, photographs and any testing required by the design, authority or manufacturer, including timing and acceptance responsibility. Establish a hold point before tile so missing coverage, unsealed penetrations or an incomplete drain detail can be corrected while the assembly remains visible.
Map the fan selection basis, controls, duct route, insulation, exterior termination, make-up air and closeout evidence without promising moisture prevention. Confirm whether routing or a new exterior penetration affects building, electrical or strata review, and preserve access needed for future cleaning.
Draw floors, walls, niches, benches, curbs, drains, valves, corners and changes of plane with the named substrate and membrane system. Require current compatible-component instructions instead of mixing isolated product claims.
State surface-preparation checks, required inspections or tests, photograph viewpoints, cure times and acceptance responsibility. Index records by wall or floor area so later tile does not erase the installation evidence.
Document fan selection basis, control strategy, intake path, duct size and material, bends, insulation, backdraft protection and exterior termination. Coordinate roof or wall penetration responsibility and commissioning without guaranteeing moisture prevention.
For each wet zone, record substrate, preparation, membrane, drain or receptor, corners, penetrations, changes of plane, cure times, compatible accessories and current product instructions. Add required inspection or test checkpoints and indexed photographs before tile conceals the work. Trace fan controls, intake path, duct size and material, bends, insulation and exterior termination, with commissioning evidence. Record reviewed substitutions. The book documents installed layers and airflow work but cannot promise a leak-free room, prevent every moisture condition or replace project-specific design and trade responsibility.
Primary references
Links checked in the approved research packet on August 26, 2026. Applicability still depends on the property and proposed scope.