Wykamol Waterproofing Membrane kit for tanking basements 40 & 48 sqm

Price excl. VAT
Price incl. VAT
(29 items in stock)

Our 8 mm waterproofing membrane kit has everything you need for tanking basement walls. Wykamol cavity drain membranes are also great for using on floors prone to high groundwater levels or persistent moisture.

What is an 8 mm Cavity Drain Membrane?

The CDM is an 8 mm high water-resistant sheet with 7 mm deep studs at 25 mm centres. The stand-off studs create a constant drainage gap. The void's volume is almost 5 litres per square metre. There is an 80 mm wide flange to ease the sealing of overlapping sheets. Our 8 mm membrane kits come in two sizes, each 20 meters long. The 2m high roll unwinds to a 40 sqm sheet. The 2.4m high version uncoils to give a 48 sqm membrane. The kit includes 40 or 48 sqm of membrane, 200 nylon brick plugs plus seals and one roll of waterproofing tape to seal the joints.

How do you use 8 mm Waterproofing Membranes in Basements?

Cut and hang the membranes like wallpaper. Instead of using a paste, fix them to basement walls using nylon brick plugs with waterproof seals. For floors, lay the roll like you would set Lino. Use waterproof tape to seal the joints on both surfaces and at the junctions between them.

Type C Waterproofing.

Basement waterproofing membranes form part of a sealed tanking system. The system must manage and dispose of water entering a building behind the membrane as per BS 8102 : 2022. Our Wykamol 8 mm cavity drain membranes are BBA approved for Type C waterproofing.

  Wykamol CM 8 mm Cavity Drain Membrane   Data
  Material   HDPE
  Sheet Thickness   0.8mm
  Membrane Height   8mm
  Stud Height   7mm
  Water Void Capacity   4.95L//m²
  Weight   0.5 Kg/m² 
  Water tightness at 60 kPa   >24 hours
  Working Temperature   -50°C to +80°C
  Softening Temperature   126°C
  Mean Compressive Strength   169 kN/m² 

Delivery options are only available for delivery to mainland UK (excluding Scottish Highlands, Scottish Islands, Channel Islands, Isle Of Man Northern Ireland and Eire). Delivery to Scottish Highlands, Scottish Islands, Channel Islands, Isle Of Man, Northern Ireland and Eire are limited to 20kg and are available at a Premium rate. Please contact us on or via our help line if delivery is required outside these areas. Alternatively select ‘World-wide Delivery’ and a member of our sales staff will contact you regarding your options and costs.


We offer for the mainland UK , as standard, a FREE delivery service on all orders having a value greater than £200.00 (excluding VAT). For orders having a value less than £200.00 (excluding VAT) a carriage fee of £8.50 + VAT will be levied. Goods will be sent by a national carrier on their 1-2 working day standard service. Customers must understand that delays can always happen while their order is with the courier, for this reason we can not guarantee your order will be with you next day.

It is important that the customer ensures that all the delivery details are correct and that the customer or someone acting for the customer is able to sign for the delivery. Twistfix accept no liability for failed deliveries as a result of incorrect delivery details or the absence of any authorised signatory. Twistfix will attempt delivery to the recipient between the hours of between 8am and 6pm. If no one is available to receive the delivery an attempt may be made to leave the item with a neighbour. Alternatively the carrier may return the item to the sorting office and leave a calling card at the recipient's address to advise of the attempted delivery. It is the responsibility of the customer to arrange to collect the item from the depot or to arrange re-delivery with the carrier. Further information regarding Delivery can be read at our Terms & Conditions.


Items returned and received in their original condition and packaging within 14 days of delivery will be accepted for exchange or refund subject to a 20% restocking fee. You will be responsible for the shipping costs incurred in returning the goods and should ensure the items are adequately insured while in transit to us. You should email to request to return items.

Where the goods are being returned because they are faulty or are not the goods that were ordered then, subject to the goods being returned in re-saleable condition, Twistfix will refund the cost of return shipping. Further information regarding Returns can be read at our Terms & Conditions.