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PermaSEAL 8 Clear Membrane 40m²

100% of 100
£120.00 Ex VAT
£144.00 Inc VAT

PermaSEAL 8 Clear is a cavity drain waterproofing membrane for use internally, both above and below ground. It’s suitable for walls, floors & vaulted ceilings.

Clear Cavity Drain Membrane

PermaSEAL 8 Clear is a high quality, high density polyethylene (HDPE) membrane. With a stud depth of 8mm, this versatile clear membrane is suitable as both a wall and floor membrane.

PermaSEAL 8 can be used in the following applications:

  • waterproofing structures below ground level such as basements, cellars, soffits, vaulted ceilings (provides Type C protection)   
  • isolating damp walls above ground level

The 8mm stud profile provides 5.3 litres of drainage volume per m2. 

Type C waterproofing

PermaSEAL 8 Clear is a clear cavity drain membrane. It is suitable for use in accordance with BS8102:2022 to provide ‘Type C drained protection’ to structures below ground. It also provides a Grade 3 dry environment suitable for domestic or commercial use.

When you are looking to achieve ‘Type C’ protection, you will need to use a PermaSEAL Sump and Pump system in conjunction with this clear basement membrane (unless passive drainage is available on one side of the building). It also needs to be maintained throughout the lifetime of the installation.

Benefits of PermaSEAL 8 Clear Waterproofing Membrane

PermaSEAL 8 clear membrane is guaranteed for 30 years and has a life expectancy of at least 50 years (DIN 9001:2000). This inert product is highly resistant to water with high compressive loading stability. It’s easy to install too – you can even cut the membrane to size using scissors.   

Installing PermaSEAL 8 on a wall

When installing PermaSEAL 8 clear on a wall, you should use our innovative PermaSEAL Quick Plug

If a below ground waterproofing system is being installed then it should be used with our:


This BBA-approved clear waterproofing membrane can accept a range of wall and floor finishes. PermaSEAL Quick Plugs and Brick Plugs accept screws – this means you can add batons and metal lath systems. These can also be insulated before the addition of a plasterboard finish. 

Fixtures, fittings walls and staircases can be built off PermaSEAL 8 Clear membrane. When used as a floor membrane, it can accommodate insulation, underfloor heating, screed and floating floors.

PermaSEAL waterproofing system

Our PermaSEAL waterproofing system is trusted by professionals. You can use our PermaSEAL 8 and 20 membranes and related products safe in the knowledge they meet the highest quality levels.

Permagard – Providing Solutions. Inspiring Confidence. 

If you have any questions about installing PermaSEAL 8 Clear or any other cavity drain membrane then call our expert team on 0117 982 3282. With over thirty years’ experience in waterproofing, we’re here to help.  


  • 8mm stud depth providing 5.3 litres of drainage volume per m2
  • High compressive load bearing strength 200kN/m2
  • Waterproof, salt-resistant, root-resistant, contaminant-resistant
  • Easy to bend, form around windows, doors, vaulted ceilings etc
  • Easy to cut with scissors
  • Low & high temperature tolerances
  • Resistant to bacteria, fungi, and other small organisms.
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