JUTA GP®SAM gas protection self-adhesive membrane is a bituminous gas-proof and waterproof sheet. It is used for the gas/ waterproofing of underground structures where harmful ground gases are anticipated and as a self-adhesive accessory to GP®1.

JUTA GP®SAM is composed of self-adhesive SBS polymer-modified bitumen incorporating GP®1 with an upper surface finish of Black reinforced LDPE, and a lower surface finish of siliconized release film.


Roll weights can be in excess of 20kg (approx. 33kg / roll) and hence appropriate care and equipment are required for unloading and handling. This product is non-toxic nor flammable.


Rolls of JUTA GP®1 SAM should be stored horizontally, and pallets should not be stacked on top of one another. It should be stored in a cool, dry place and be protected from exposure of rain, sun, heat and cold temperatures prior to installation. Exposure to sunlight for an extended period of time could cause difficulty with the removal of the release film.

Thickness 1.00mm
Width 0.3 or 1 m
Length 20 m
Weight 1100 g/m2
Water Vapour Transmission Rate 0.013 g/m2/ day
Full Information Check out the full data sheet above

JUTA GP®1 SAM should be installed in accordance with the product installation guidelines and in accordance with BS 8485:2015. It is recommended that JUTA GP®1 SAM is not applied in temperature below 10°C in colder weather the material can be warmed slightly to aid adhesion.