A sheet membrane that provides high performance waterproof and vapour barrier protection for numerous applications. The unique properties of the GC1 membrane system enable it to form a fast and highly durable waterproof finish enabling surface finishes such as tiles, screeds and toppings to be applied immediately after the membrane system has been installed.

  • Waterproof layer and vapour barrier


  • Internal wet areas, wet floors, showers, laundries
  • Sandwich sealing between existing and new slabs
  • Internal anti-fracture flooring system for tiles over concrete
  • Vapour sealing for wall and floor substrates
  • Sandwich sealing between existing and new concrete toppings


  • Render, screeds and general masonry surfaces
  • Concrete blocks and clay brick
  • CFC, cement sheet, Hardies Scyon™, plaster board surfaces
  • Plasters and general mineral surfaces
  • Aerated concrete panels and blocks
  • Metals

GC1 Sheet: 30m x 1m roll = 30m2
GC1 Adhesive: 1 x 20kg bag will cover 15m2

Blue sheet

Cardboard carton, consisting of 1 Roll: 30m x 1m
GC1 Adhesive – 20kg bags