Irish Wet-Room Waterproofing: System and Project Checks

Specify the whole wet-room system

A shower floor needs more than a claim that a board or tile is water resistant. Get a design for the floor, walls, joints and drain as a whole. The design must suit the room, base and products being used.

Start with the Irish project’s rules and design brief. Then check the membrane system’s current instructions and any relevant product certificate. A British tiling standard is not automatically Irish law. Use a standard where the project calls for it, and check its scope and edition.

Before work starts

• Agree which surfaces need a membrane, and how it joins at corners and doors.
• Choose the drain detail with the membrane, not after the floor is laid.
• Check falls, base stiffness, primer, coats and drying times.
• Record the installed system and the checks made before it is covered.

This page gives no universal Irish membrane height or floor-fall figure. Those details need the selected system and project design. A product data sheet alone does not prove that the whole room meets all building rules.

Sources and limits

Technical Guidance Document C is the official starting point for site preparation and moisture resistance. The full current PDF could not be rechecked in this review. This page therefore does not claim that Irish law has no wet-room duties.

Use NSAI’s standards service to confirm a specified Irish standard. Full paid standards and a project wet-room design were not reviewed here. Content scope checked on 6 September 2026.

Irish building-code hub.