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JUTA GRSAM is a self-adhesive bituminous waterproofing sheet composed of an SBS polymer modified bitumen with an upper surface finish of aluminium foil to provide resistance to methane, radon and carbon dioxide and a lower surface finish of siliconized polypropylene release film. The product is used for the waterproofing of underground walls where potentially harmful gases are located.

Features and benefits:

  • Totally impermeable to water and water vapour.
  • High amount of flexibility to aid ease of application.
  • High resistance to weathering both at high and low temperatures.
  • Resistant to UV.
  • Strong adhesive bonds on different types of surfaces; concrete, metal, tile, block and brick etc.
  • Quick and easy self- adhesive application.

CE marked and meets the requirements of CTE, EN 13707, EN 13969, EN 13859-1 and EN 13859-2 norms.

Related literature

The following content references this product:

Standard product features

Technical characteristics:

  • Size (l x w): 20 x 0.3 or 1 m.
  • Thickness (nominal): 1.2 mm.
  • Mass per unit area (nominal): 1 kg/m².
  • Watertightness to EN 1928: Pass.
  • Longitudinal and transversal tensile strength to EN 12311-1: 200 N/50mm.
  • Methane permeability to EN ISO 15105-1: <0.53 ml/m2/day/atm.
  • Carbon dioxide permeability to EN ISO 15105-1: <0.53 ml/m2/day/atm.
  • Radon permeability to K124/02/95 : 2.9 x 10 - 14 m²/s.

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-65-50/301 Reinforced bitumen sheets for roofing

Product specification

An important note about specifying



Juta UK Ltd


+44 (0)1772 754177

Product reference


Manufacturer details

Melton Grove Works,
Church Road,
Lytham, FY8 5PL
Tel +44 (0)1772 754177
NBS Plus