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Newton CDM 503 Membrane

Save £94.50 inc.VAT

Size: 2 x 20mm
Sale price£164.50 inc.VAT Regular price£259.00 inc.VAT


BBA certified, 3mm Cavity Drain Membrane for Basements – Suitable for use internally below the ground to retaining walls, vaulted soffits and floors.

Newton CDM 503 Membrane is a high quality cavity drain waterproofing and damp proofing membrane suitable for use internally above or below the ground to retaining walls, vaulted soffits and floors.

CDM 503 can be used within our Newton CDM System that includes Newton drainage and pumping systems. Please see the Newton Installation Manual for details on fixing and finishing of the product.

CDM 503 holds BBA certification (94/3010).

Key Benefits
  • Does not require extensive and damaging preparation to the wall surface
  • Speed of installation
  • Provides vapour control and when used with humidity control systems is capable of delivering an environment to all levels within a Grade 3 environment to BS 8102:2022
  • Resistant to chemically aggressive groundwater, efflorescing salts and hydrocarbon contamination
  • Rot-proof and resistant to root penetration
  • Shallow stud profile for where space is at a premium
Typical Applications

As a waterproofing membrane as part of the Newton CDM System and be used as both the wall and the floor membrane for the waterproofing of:

  • Basements
  • Cellars
  • Vaults
  • Tunnels
  • Arches
BS 8102:2022

The British Standard 8102:2022 Code of Practice for Protection of Below Ground Structures Against Water Ingress is the main design guide for structural waterproofing in the UK.

The Newton CDM System is a maintainable system, so complies with BS 8102 requirements. The standard also specifies that: “a waterproofing specialist should be included as part of the design team so that an integrated waterproofing is created”

Therefore it is our recommendation that the Newton CDM System is installed by a Newton Specialist Contractor (NSBC).

Associated products

CDM 503 Associated Products:

For further information please call our customer services team, 01268 472358.

Product Data

Code: M5

Packaging: Roll 20.0m x 2.0m

Colour: White / Translucent

Area: 40/m²



Newton CDM System - Overview

The Newton Cavity Drain Membrane (CDM) System is a maintainable basement waterproofing solution, certified to BES 6001 by BRE Global, ideal for new-build basements and refurbishment projects.

The four components of the Newton CDM system

Comprising of four components: Cavity Drain Membranes, Drainage, Pumps and Control Systems, the Newton CDM System complies with the British Standard for Waterproofing and provides a Grade 3 habitable internal environment.

Cavity Drain Membranes and Drainage

Cavity drain membrane (CDM) systems are a maintainable, internal basement waterproofing solution, suitable for protecting below-ground environments against water that has penetrated through the structure. CDM Systems are known as ‘Type C’ waterproofing in British Standard 8102:2022 and are ideal for new-build, refurbishment and historic/listed projects.

Known as the most failsafe form of waterproofing, the cavity drain membranes capture ingressing water at the point of ingress, then the CDM drainage system manages and directs the water to an integral pumping system or drainage outlet for safe removal.

The Newton PAC-500 System also provides a combined CDM waterproofing and gas proofing system for below ground spaces that are at risk from ground gases.

Pumps and Control Systems

Once the water has been captured by the cavity drain membranes and drainage channels, it needs to be safely removed. The Titan-Pro is a packaged sump chamber and pump system designed specifically to be used with the Newton CDM System. Compatible with a variety of Newton pumps, it is ideal for almost any cavity drain waterproofing system.



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