How to Waterproof a Bathroom

How to Waterproof a Bathroom

Bathroom waterproofing is a complete system of substrate preparation, membranes, joints, drainage details and testing beneath the visible finish.

Prepare a stable base

Surfaces must be sound, clean and formed to the correct falls before waterproofing begins.

Detail every interruption

Corners, pipe penetrations, niches, thresholds and drain connections need compatible system details.

Test before covering

Where appropriate, controlled testing and inspection should be completed before finishes hide the membrane.

Practical checklist

• Use one compatible waterproofing system
• Follow coverage and curing requirements
• Record concealed details and test results

Tiles and grout are finishes; they should not be treated as the primary waterproof layer.