CDM Type C Cavity Drain Membrane Systems
Clever Shield supplies a professional range of CDM Type C cavity drain membrane systems for internal basement and below-ground waterproofing. Our collection includes cavity drain membranes, mesh membranes, drainage channels, pumps, fixings, and sealing tapes, providing complete Type C waterproofing solutions for residential and commercial projects.
We stock trusted manufacturers including Mapei, Newton Waterproofing, and Wykamol, ensuring reliable performance and compliance with UK waterproofing standards, including BS 8102.
What Are CDM Type C Waterproofing Systems?
Type C cavity drain membrane systems are a widely used and trusted method of below-ground waterproofing. Instead of blocking water, they control and manage water ingress, allowing moisture to enter a drainage cavity where it is safely directed to perimeter drainage channels or sump pump systems.
Type C systems are ideal for:
- Basements and cellars
- Below-ground refurbishments
- Basement conversions
- Residential and commercial structures
Type C waterproofing is recognised under BS 8102: Protection of Below Ground Structures Against Water Ingress.
Why Choose CDM Type C Systems from Clever Shield
- Trusted manufacturers – Mapei, Newton Waterproofing & Wykamol
- Complete system solutions – Membranes, drainage, pumps & accessories
- Effective water management – Controls ingress and reduces damp & mould risk
- Flexible finishes – Suitable for dry-lining or plastered wall systems
- Residential & commercial use – Proven in new builds and refurbishments
- Next Day UK delivery on most stocked Type C products
Products in This Collection
- Cavity drain membranes – Studded membranes for internal Type C waterproofing
- Mesh membranes – Designed for direct plastering or rendering finishes
- Drainage channels & accessories – Safely direct water to discharge points
- Membrane tapes & fixings – Ensure secure and watertight installation
- Type C pumps & sump systems – Actively remove collected water from basements
CDM Type C Waterproofing FAQs
What is a Type C cavity drain system?
A Type C system is an internal waterproofing solution that manages water ingress by directing it through drainage cavities to a safe discharge point, such as a sump pump.
When should a Type C system be used?
Type C systems are ideal for basements, cellars, and below-ground structures where water ingress is expected or possible, particularly in refurbishment and conversion projects.
Is Type C waterproofing compliant with BS 8102?
Yes. Type C cavity drain membrane systems are recognised under BS 8102 as a compliant method for protecting below-ground structures against water ingress.
Do Type C systems require pumps?
In most cases, yes. Water collected behind the membrane is typically directed to a sump pump system to ensure safe and controlled removal.
Can Type C membranes be plastered or dry-lined?
Yes. Mesh membranes are designed for direct plastering, while plain membranes are suitable for dry-lining systems.
Do you offer next-day delivery?
Yes. Next Day UK delivery is available on most stocked CDM Type C waterproofing products.
Related Waterproofing Solutions
- Floor membranes – Protect slabs and floor finishes from moisture
- Wall membranes and cavity drain systems – Used to manage water ingress behind internal walls
- Drainage channels and accessories – Direct water safely to sump systems
- Pumps and chambers – Active water removal in basements
- Type A waterproofing systems – Barrier protection at the structure
- Type B structural waterproofing – Integral concrete protection
📞 Call 01268 472358 for expert Type C waterproofing support
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