Dual Seal waterproofing membrane has been specifically developed for use as a high performance waterproofing membrane to provide a totally watertight barrier in below ground concrete construction, including basements, underground car parks, plant rooms, access tunnels etc.

Dual Seal Membrane can be installed in damp conditions and is, therefore, particularly suitable for use as a roof waterproofing system for earth covered potable water reservoirs.

  • Provides a totally watertight barrier which is 10 times greater than concrete
  • Resistance to Hydrostatic head of water of 46m
  • Can be applied immediately shutters are struck to wet surface/green concrete
  • Can be installed in damp conditions
  • Prevents tracking of water between membrane and concrete surfaces
  • Surface does not require priming
  • Installation temperature -30°C to +50°C
  • Easily installed by non-skilled operatives
  • Non-toxic
  • Eliminates need for separate protection board
  • Does not require welding
  • In excess of 5,000,000m2 successfully installed worldwide
  • U.K. Water Fitting Byelaws Scheme Listed for use with potable water
HDPE Thickness: 0.5mm
Total membrane Thickness: 5mm
Roll Width: 1.22m
Roll Length 7.32m
Coverage per roll (allowing 50mm overlaps): 8.59m2
Physical properties Value Test Method
Tensile Strength:Membrane N/mm2 27.50 N/mm2 ASTM D412
% Elongation at Break 700% D638 Type
Puncture Resistance 43kg FTMS 101B
Resistance to Hydrostatic Head (Metre of Water) 46m ASJM D751 method a
Resistance to micro organisms
(bacteria, fungi, mould, yeast)
U.K. Water Fittings Byelaws Scheme listed for use with potable water