Description
Clever Shield CM8 Cavity Drain Membrane – BBA Certified Type C Waterproofing System
Available in other variants - View all CM8 Membrane Products
The Clever Shield CM8 Cavity Drain Membrane is a high-performance Type C drained protection waterproofing membrane designed for use in structural waterproofing systems in accordance with BS 8102.
Manufactured from durable high-density polyethylene (HDPE), the membrane forms a drainage cavity between the structure and internal finishes. Groundwater entering the structure is safely managed through perimeter drainage channels and sump pump systems, allowing water to be controlled and discharged.
The system is designed to transform damp or water-affected areas into dry, habitable environments suitable for basements, cellars and below-ground structures.
Clever Shield CM8 membranes are BBA certified, providing assurance of quality, durability and performance for professional waterproofing installations.
Need specification advice or pallet pricing?
📞 Speak to our waterproofing specialists: 01268 472358
Key Features
- BBA Certified System – Independently certified for structural waterproofing performance.
- BS 8102 Compliant – Suitable for Type C cavity drain waterproofing systems.
- Creates Dry, Usable Spaces – Converts damp basements into habitable areas.
- Water & Contaminant Resistant – Prevents water ingress while resisting salts, roots and contaminants.
- Minimal Surface Preparation – Installs directly onto uneven masonry or concrete.
- Fast Installation – No drying time required before internal finishing.
- Flexible & Easy to Cut – Easily trimmed around windows, doors and services.
- Durable HDPE Construction – Resistant to high and low temperature conditions.
- Clear Membrane Design – Allows accurate positioning of membrane plugs during installation.
Typical Applications
- Basement waterproofing systems
- Cellar conversions
- Below-ground waterproofing
- Damp wall protection
- Structural waterproofing projects
- Retrofit basement waterproofing
- New build basement construction
System Compatibility
The Clever Shield CM8 membrane forms part of a complete Type C cavity drain waterproofing system and is typically installed with:
- Perimeter drainage channels
- Sump chambers and pump systems
- Membrane fixing plugs
- Joint sealing tape
- Dry lining or batten wall systems
This maintainable system ensures water entering the structure is safely controlled and removed.
Alternative High Density Membrane
For projects requiring enhanced compressive strength or higher durability, consider:
Clever Shield CM8 HD700 – an ultra high-density cavity drain membrane suitable for demanding structural waterproofing applications.
Our technical team can assist with selecting the correct membrane for your project.
📞 Technical Advice: 01268 472358
Technical Documentation
Download official documentation for the Clever Shield CM8 membrane system:
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BBA
BBA Certification Clever Shield CM8 Cavity Drain Membrane 18 5595
Performance
Declaration Of Performance CM8 HD700 Cavity Drain Membrane WPDOP036 2019 08
Declaration Of Performance CM8 Cavity Drain Membrane WPDOP03 2019 08
TDS
These documents provide full technical specifications, installation guidance and compliance information.
Frequently Asked Questions
What is a Type C cavity drain waterproofing system?
A Type C waterproofing system manages water entering a structure by directing it behind a cavity drain membrane into drainage channels and sump pumps for controlled removal.
Is the Clever Shield CM8 membrane BBA certified?
Yes. Clever Shield CM8 membranes are BBA certified, confirming their suitability for structural waterproofing applications.
Can the CM8 membrane be installed on damp walls?
Yes. Cavity drain membranes are designed to be installed on damp substrates because the system manages water behind the membrane.
How is the membrane fixed to walls?
The membrane is mechanically fixed using specialist membrane plugs installed through the membrane into the masonry substrate.
Can CM8 membranes be used on floors?
Yes. CM8 membranes can be installed on walls and floors as part of a complete basement waterproofing system.
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