Internal Waterproofing Systems

The MacLennan cavity drain system is an internal lining system which provides a cavity through which water will pass.

The system consists of a profiled plastic wall membrane which drains to a plastic drainage channel (sited at the wall floor junction) and a profiled plastic floor membrane.

Further to this sumps and pumps will also be required if natural drainage is not available. BS8102 requires that all waterproofing is maintainable and repairable. How do you comply with BS8102?


Get in touch with our technical team today!

The advantage of this Cavity Drain Membrane systems

Are that they are easily repaired, also quickly and easily maintained, They do not impose any load onto the structure (particularly important when dealing with older structures). Regularly used to re waterproof failed external systems and waterproof concrete.


  • System can be guaranteed for 20 years.
  • Installed after the basement construction.
  • Unaffected by site conditions weather
  • 10 year GPI insurance guarantee.
  • Very flexible accommodates any movement.
  • Very fast track to install and there is no drying period.
  • Can deal with flood water.
  • MacLennan products guarantee.
  • Completely serviceable.
  • Complies fully with BS8102

Call our qualified and experienced design team to discuss your project 08456587777.

Have a look at the technical details for your project click here

  • .


    - Cavity Drain System Sussex
  • .


    - Showing Head Of Wall Blockwork.
  • .


    - Cavity Drain System - Roundhill
  • .


    Typical detail through base of retaining wall.
  • .


Why should I work with MacLennan?


We Design, supply and install. There's no split responsibility with MacLennan.


MacLennan live and breathe waterproofing, have a look at one of our free CPD seminars and find out!


MacLennan has the most comprehensive guarantees and insurances in the industry.

Safe Contractor Approved
ISO URS 9001
Chas Advanced
Acclaim Health And Safety Approved
Constructionline Gold Member
Achilles Building Confidence
The Radon Council Member
Safe 4 Site Gold Member

Get in touch!

Ready to start a project or require more information about us?
Call us about your project or problem and we will be happy to help.

Call us today on:

0330 3200 240
Or email us here