Home > Companies > Triton Systems > Triton TGS – GV25

Triton TGS – GV25 is a 25 mm thick single-sided geo-composite that provides a void beneath floor slabs which, when connected to air inlets and outlets, allows sufficient air changes to dilute gases (methane, carbon dioxide, radon and hydrocarbon vapour and liquid) to safe concentrations when designed correctly.

The membrane can be laid in strips at pre-determined centres or in a blanket as required, and being only 25 mm thick results in quicker installation when compared to a 200 or 150 mm blanket of stone. It is also extremely strong and flexible with a crush resistance of 250 kPa and large areas can be covered quickly. Can be laid horizontally and vertically to deal with awkward foundation arrangements. It will cope easily with settlement under the slab without compromising the system.

Standard product features

Technical characteristics:

  • Roll (l x w): 50 x 0.45/ 0.90 m.
  • Thickness: 25 mm.
  • Crush resistance, 200 kPa for 100 h: 5% (maximum).
  • Intrinsic permeability (k): <1.2 x 10-5 m².
  • Ultimate compressive strength at yield: 225 kN/m².

NBS Specification

NBS Create logo
This product is associated with the following NBS Create clause:
45-65-50/325 Plastics sheets

Product specification

An important note about specifying



Triton Systems


+44 (0)1322 318830

Product reference

Triton TGS – GV25


[Connector T-piece]
[Ground level gully vent box]
Required to be set in 150 mm surround of no fines concrete. No vehicular trafficking should be driven over the vents.

Manufacturer details

Units 3-5,
Crayford Commercial Centre,
Greyhound Way,
Kent, DA1 4HF
Tel +44 (0)1322 318830
Fax +44 (0)1322 524017
NBS Plus