Torch Flex Ultra-Vent


High performance polyester reinforced, rubber modified roofing underlay designed to be used in torching applications. It includes adhesive strips on the underside, which allow trapped vapour to disperse throughout the roofing system. The unique adhesive qualities of the thermoplastic bitumen strips ensure that the bonding quality equals that of a traditional roofing system using conventional venting underlays.

It can be used in conjunction with Torch Flex Ultra Bond vapour barrier and StressPly® membranes to create a roof system with a low installation cost which doesn't compromise on the quality and life expectancy of the completed system.


Garland Garla-Prime®: To be specified separately (if required).

General information


Bitumen modified with thermoplastic rubber (SBS)

Uniclass 2015

Pr_25_57_08_75 Reinforced bitumen roofing sheetsPrimary

Product range

Underlay Membranes

Specification data - Reinforced bitumen roofing sheets

Product Reference

Torch Flex Ultra-Vent

Standard product features


Bitumen modified with thermoplastic rubber (SBS).


Reinforced and stabilized non-woven polyester mat.

Size (l x w):

8 x 1 m.


3 mm.

Technical properties:

  • Breaking elongation (L/ T): 45/ 45%.
  • Dimensional stability: ±0.2%.
  • Low temperature flexibility: -20°C.
  • Resistance to tearing (L/ T): 150/ 150 N.
  • Tensile strength (L/ T): 900/ 700 N/ 50 mm.
  • Watertightness: 60 kPa.