Mapei Wet Room Tanking Kit

A complete, professional-grade waterproofing system for wet rooms, shower areas, and bathrooms.

Built around Mapegum WPS — a ready-to-use, single-component flexible membrane — the kit includes everything needed to fully waterproof a floor and wall junction before tiling: membrane, jointing tape, internal corners, a waste outlet gasket, and a pipe inlet kit.

Applied by trowel, roller, or spray, Mapegum WPS forms a flexible, anti-fracture barrier that accommodates minor substrate movement without cracking, and can be used over plasterboard, gypsum or cementitious render, lightweight cement block, and marine plywood.

With a recoat window of just 1–2 hours and a full dry time of 5 hours at standard conditions, the system keeps the job moving without extended waits between trades.

Technical Specifications

Kit Contents

Key Features

• Complete tanking system — membrane, tape, corners, waste gasket, and pipe inlet kit all included, removing the need to source components separately
• Flexible, anti-fracture membrane — Mapegum WPS accommodates minor substrate movement, reducing the risk of cracked tiles or failed waterproofing over time
• Fast recoat time — 1–2 hours between coats keeps the installation process moving and minimises downtime on site
• Tiling can begin within 12–24 hours — short wait time before laying ceramic allows the project to progress efficiently
• Full cure in 5 hours — at 23°C and 2mm thickness, the membrane reaches complete dryness quickly under standard conditions
• Ready to use — single-component, solvent-free formula requires no mixing and is safe to handle in enclosed bathroom spaces
• Versatile substrate compatibility — suitable for use on plasterboard, gypsum or cementitious render, lightweight cement block, and marine plywood, covering the most common wet room constructions
• Multiple application methods — can be applied by trowel, roller, or spray to suit installer preference and site conditions
• Waste and pipe penetrations covered — dedicated gasket and pipe inlet kit ensure vulnerable points around the drain and pipework are properly sealed within the same system
• Internal corners included — pre-formed Mapeband corners ensure consistent, reliable waterproofing at wall-to-wall junctions where failures most commonly occur
• Long shelf life — 24-month storage life when kept frost-free, making stock management straightforward for trade buyers
• Trusted Mapei system — components are designed to work together as a single engineered system, providing a manufacturer-backed waterproofing solution

Free delivery to UK Mainland on orders over £100

£4.95 delivery to UK Mainland on orders under £100

Orders placed before 12 noon will usually be delivered next day.

Unfortunately we can't currently deliver to Northern Ireland.

Find out more

Please note that we charge a £42 restocking fee for all returns except where the item is damaged or defective.

Our returns policy lasts 30 days. If 30 days have gone by since your purchase, unfortunately we can’t offer you a refund or exchange.

Please call our office with your invoice number for a returns authorisation before returning any item to us.