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PM20 Dimpled Sheet Membrane 40m²

£240.00 Ex VAT
£288.00 Inc VAT

A high capacity dimpled drainage membrane from PMI-Plast for basement walls and floors with 20mm cavities providing high drainage capabilities.

PM20 Dimpled Drainage Sheets – 20mm

PM20 dimpled membranes from PMI-Plast are designed as high capacity drainage membranes for basement waterproofing. The 20mm dimples create a cavity that can effectively deal with large volumes of water ingress as part of a cavity drainage system. 

PMI dimpled membranes are manufactured from virgin HDPE, making them long-lasting and reliable. They are easy to install and provide peace of mind for homeowners at risk of flooding when installed as part of a Type C system.

Uses of PM20 Drainage Sheet

PM20 dimpled cavity drain membranes comply with BS8102 Type C Waterproofing systems standards so can be used on internal walls and floors of newly constructed or existing basements, cellars and earth-retaining structures. 

Installing PM20 Membrane

For full installation guidelines consult the manufacturer’s instructions. The PM20 dimpled high capacity drainage membrane can be installed both vertically and horizontally.

For more information on basement waterproofing read our conversion guide.            

Permagard - Stockists of PMI Membranes

It is important that you select the correct membrane when waterproofing your basement or cellar. Please contact our technical department if you have any questions. You can also browse our cavity drain membranes, sump pumps and basement waterproofing categories. Call us on 0117 982 3282.


  • Easy to install
  • Made from virgin high-density polyethylene (HDPE)
  • Large drainage capacity of approx. 9 l/sm
  • Resistant to bacteria and fungi, rot-resistant, root-resistant
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