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Proofex Torchseal A400

Proofex Torchseal A400

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Perforated reinforced base sheet to relieve water vapour pressure from under multi-layer torch-on membrane systems

Replaces Index Vapour Diffuser



Proofex Torchseal A400 is a perforated membrane for connecting layers for waterproofing semi-adhesive systems, made of polymer-bitumen with reinforced fibreglass reinforcement. The 40mm diameter perforations are distributed evenly over the surface of the membrane providing 14% bonding area.


Proofex Torchseal A400 is used for spot bonding torch applied bituminous membranes particularly over substrates with relatively high humidity. It should be used as a first connecting layer to avoid the formation of blisters in waterproofing membrane applied on concrete which will remain visible to the eye. 
Proofex Torchseal A400 acts as a vapour diffusion layer if it is used as a connecting layer between a vapour barrier to be applied on a cement substrate of environments with a high level of relative humidity.
For restoration work, it is used to connect a new layer which will remain visible, with an old bituminous surface which has captured humidity.
The choice of using a spot bonded connecting layer should be subject to the careful evaluation by the planner of the roof and of the wind force present where the membranes will be applied.


  • Cost effective
  • Quick to install
  • Allows the homogeneous distribution of spot-bonded adhesion zone
  • The finish layer is more resistant to the wind and is more stable to temperature variations than with other spot bonded methods

Product Fact Sheet

Proofex Torchseal Fact Sheet

Technical Data Sheet

Safety Data Sheets


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