Home Breather Membrane Permavent PRO VCL

Permavent PRO VCL



Don't sweat, protect.
A technologically advanced Breathable Vapour Control Layer (VCL) for use as a vapour and air leakage barrier with additional reflective insulation properties.
For use primarily behind the plasterboard in:

  • - Air tight and passive buildings
  • - Room in the roof construction
  • - Loft conversions
  • - Timber frame construction
  • - Ceiling and loft separation layer


Weight 82g/m2
Water vapour transmission (sd) 200 m
Maximum tensile force (MD) 140 N/50mm
Maximum tensile force (CD) 110 N/50mm
Elongation % 30%
Resistance to tearing MD (nail shank) 100N
Resistance to tearing CD (nail shank) 120N
Reaction to fire class F
Emissitivy 0.07
Reflectivity 93%
Roll size: 1m x 50m  50m2


* Other roll sizes are available upon request

We all generate moisture in the form of water vapour when we breathe, cook, shower and dry clothing etc. This moisture is attracted to cold surfaces. Moisture can travel through most building products (such as plasterboard, bricks and timber) as it attempts to escape from our buildings. Normally invisible, it is only when this moisture cools that it can be seen as condensation, which damages not only the decoration but also the structure of our buildings such as inside walls and roofs, this is known as interstitial condensation.
Modern construction methods such as increased insulation, air-tight construction and a modern style of living have considerably increased the incidents of condensation in the home. A breather membrane alone will struggle to cope with such large amounts of moisture and can become overloaded.
Because this moisture is present in all buildings a Vapour Control Layer is an important part of modern construction (BS5250). Most VCL’s will not allow any moisture to pass through them and it can condensate on the surface whereby the VCL can appear to ‘sweat’.
Permavent Pro VCL has been specially designed with the exact amount of breathability required to allow the building to breath, in conjunction with systems such as breather membranes, whilst still protecting the structure from interstitial condensation. The highly technological design of Pro VCL has been specifically developed to remain airtight and in conjunction with the super reflective coating, Pro VCL will reduce heat loss and also save energy.

- Protection from interstitial condensation
- Air leakage barrier
- Vapour Control Layer
- High reflectivity and low emissivity



Following the success of the Queen’s award winning Easy Verge, here at Permavent we are proud to announce the launch of the recently developed Easy VergeTrim. This latest addition to the Easy Roof System has been specially designed to meet the requirements of the Scottish and refurbishment markets.

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