VB4 Expal Vapour Barrier

VB4 Expal is a 4 mm thick, robust, torch-applied, elastomeric bitumen vapour barrier, featuring a tear resistant aluminium foil lining for vapour impermeability. 

Technical data
DOWNLOADS Data sheet » DoP »
Roll size 1 x 7.5m
Surface finish Top: Mica
Bottom: Thermofusible polyethylene
Weight 4.5Kg/m²
Thickness 3.5mm
Reinforcement Polyester coated aluminium foil + 60g/m2 glass fleece
Tensile strength (EN 12311-1) Length ≥ 400N/50mm
Diagonal ≥ 400N/50mm
Elongation at break (EN 12311-1) Length ≥ 2%
Diagonal ≥ 2%
Heat stability (EN 1110) +70°C 
Cold bending (EN 1109) -20°C

Want more information?

Call us
Call us

Arrange a local meeting or speak with our technical team

0845 271 8800
Register
Register

Get instant access to resources from our Technical Centre

Register now