🎄 Christmas Dispatch Notice
Please note that Clever Shield will be closed for the Christmas period starting from Friday 19 December 2025.
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Last dispatch before Christmas:
• Wykamol products: Friday 19 December, 11AM
• Newton products: Monday 22 December, 2PM
• All other products: Thursday 18 December, 1PM - Orders placed during the Christmas closure will be dispatched from Friday 2 January 2026.
To avoid delays, we recommend placing your orders as early as possible.
Thank you for your continued support. We wish you a Merry Christmas and a Happy New Year!
Description
CM20 Cavity Drain Membrane – High-Capacity Waterproofing Solution
The CM20 Cavity Drain Membrane is a 20mm studded waterproofing membrane, designed for Type C cavity drain systems. Providing a Grade 3 environment in compliance with BS 8102:2009 and NHBC Chapter 5.4, it is the highest drainage capacity membrane in the Wykamol Waterproofing range.
Key Benefits:
✔ Compliant with BS 8102:2009 & NHBC Chapter 5.4 – Meets industry standards for Type C waterproofing.
✔ Superior Drainage Capacity – Provides a high water void volume of 14 litres/m², effectively managing water ingress.
✔ Quick & Easy Installation – Lightweight & flexible, easily rolled out along floors.
✔ Creates a Dry, Habitable Space – Transforms previously damp areas into usable living or storage spaces.
✔ Waterproof, Salt Inhibiting & Contaminant Resistant – Protects against moisture, salts, roots, and pollutants.
✔ Minimal Structural Impact – No significant alteration to existing walls or floors.
✔ Temperature Resistant – Performs in both low and high-temperature conditions.
✔ Durable & High-Grade Material – Ensures long-lasting waterproofing performance.
✔ Easy to Cut & Adjust – Can be trimmed with a sharp blade for precision fitting.
Typical Applications:
✔ Basements & Cellars (walls & floors – creating dry living spaces)
✔ Radon Barrier Protection (approved for radon control)
✔ Waterproofing for Walls, Floors, Vaults & Tunnels
✔ Above & Below Ground-Level Applications (residential & commercial use)
Available Sizes:
📏 2m x 20m & 2m x 10m Rolls (20kg weight option available for easier handling)
Due to the weight of this product, it is transported by pallet.
The CM20 Cavity Drain Membrane is the ultimate solution for high-capacity water management, ensuring long-term waterproofing for basements, tunnels, and below-ground structures.
Details
| Product Description | CM20 Waterproofing Membrane, Black | CM20 Waterproofing Membrane, Black |
| Product Code | CM202X20 | CM202X10 |
| Packing and Size | 2 m x 20 m | 2 m x 10 m |
| Coverage | 40 m² | 20 m² |
| Storage | Store in an upright position, under cover and away from high temperatures and open flames | Store in an upright position, under cover and away from high temperatures and open flames |
| Life Expectancy | Lifetime of Structure | Lifetime of Structure |
BBA
BBA Certification Wykamol CM20 Cavity Drain Membrane 18 5595
Performance
Declaration Of Performance CM20 Cavity Drain Membrane WPDOP05 2019 08
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