Bauder VB4-Expal Air and Vapour Control Layer

VB4-Expal is a robust, torch-applied, SBS elastomeric bitumen air & vapour control layer, featuring a tear resistant aluminium foil lining for vapour impermeability. Once installed, the product provides a temporary waterproofing layer, allowing internal works to be carried out immediately.

Product Datasheet Declaration of Performance

Technical data
DOWNLOADS Product Datasheet » 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