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Procheck® A2

Procheck® A2, is a vapour and airtight membrane. Procheck A2, with it’s Class A2-s1,d0 fire classification to BS EN 13501-1, is considered non-combustible with no contribution to fire. Its composition comprises of the glass fibre backing, with a pure aluminium foil and clear lacquer coating. This composition affords the membrane its Class A2 performance as well as giving it a high degree of vapour controlling properties. The membrane comes with a high vapour resistance, as well as being airtight, which allows its use as an AVCL in the construction. Providing high levels of airtightness can ensure the thermal efficiency of the building.

  • Reaction to Fire classification to A2,s1-d0
  • Water vapour diffusion tight
  • Clear lacquered aluminium surface allows for low emissivity surface
  • Reflective material, emissivity <0.05
  • Easy to install
  • Robust and able to withstand tough site conditions
  • BBA Certified
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Material Properties

Procheck A2

Property Test Method Result
Weight EN 1849-2 165 g/m2
Sd value EN 1931 >1500 m
Reaction to Fire EN 13501-1 A2-s1,d0
Water Tightness EN 1928 W1
Tensile Strength EN 12311-1 MD 700, CD 700 N/50mm
Elongation EN 12311-1 MD 2.5%, CD 2.5%
Tear Resistance EN 12310-1 MD 150, CD 130 N
Thermal Resistance of Adjacent Airspace 0.606 m2K/W
Roll Size 1.5 x 50 m

UK Availability

North East Scotland & Islands
Linda Kay
Regional Sales Manager

07817872980

South London & South East
Josephine Matchette
Regional Sales Manager

07535450346

Wales & South West
Marc Blackie
Technical / Regional Sales Manager

07968215 755

North London & East England
Ben Cremer
Technical / Regional Sales Manager

07768817733

Head Office
The Haugh

Midlands
Kieran Basi
Regional Sales Manager

07817873003

Ireland
Anthony Ruth
Regional Sales Manager

Global Availability

North America
Jeff Dibdin
International Account Manager.

07534436615

South America
Jeff Dibdin
International Account Manager.

07534436615

Europe
Jeff Dibdin
International Account Manager.

07534436615

MENA
Jeff Dibdin
International Account Manager.

07534436615

Asia
Jeff Dibdin
International Account Manager.

07534436615

Australia
Jeff Dibdin
International Account Manager.

07534436615

  • Procheck A2, Procheck FR200 & Procheck Adapt FAQs

    • What are the advantages of Procheck A2 over Procheck FR200?

      While both of these membranes exceed the requirement for a class B-s3,d0 vapour control layer, FR200 is designed for applications with a low vapour risk, while Procheck A2 has a much higher vapour resistance, making it ideal for situations with a higher vapour load. Procheck A2 additionally has a class A2 fire rating, and a low emissivity surface to gain some thermal benefit from adjacent service cavities.

    • Do vapour control layers need to be fire rated?

      Yes, as they are membranes used within the warm side of the external wall, and per the 2018 amendments to part B of the building regulations, need to achieve at least B-s3,d0.

    • How many minutes of fire resistance do these membranes grant?

      Fire resistance is a term used to describe the amount of time that a material will provide resistance to fire, both in terms of heat isolation and physical isolation of spaces. While these membranes are airtight, and therefore would provide some physical separation of spaces, membranes cannot provide significant heat isolation, and are not usually tested for fire resistance. Fire resistance is usually applied to systems, rather than individual products.

    • Can this be used on buildings over 18m?

      Yes, both of these membranes achieve a fire performance of B-s1,d0 or better.

    • Will these improve my u-value?

      Generally, no, but you are able to use the Procheck A2 with an adjacent cavity for services, and as it has a low emissivity surface, you will gain some thermal performance from that.

    • Are these airtight?

      They are airtight, as all AVCLs are.

    • What do the classifications mean?

      The European standard 13501 defines a series of tests that materials have to undergo to determine their contribution to the spread of flame. These are ranked from F, which is a fail, up to A1, which is non-combustible. A classification of B means that the material performs very well on a single flame source test, and also that it needs to perform pass a single burning item test as well. An A class material needs to pass the same single burning item test, and also needs to release no more than a certain amount of energy in a calorific test. The s and d parts of the classification refer to smoke and flaming droplets respectively, and range from 0-2 for smoke and 1-3 for droplets, with lower numbers representing better performance.

    • Is it a VCL or a Breather Membrane?

      Procheck Adapt is a vapour control layer, but one with a variable vapour resistance. This means that it’s vapour resistance when the climate is warmer and less humid, allows some breathability. With this, materials inside of the VCL are more able to dry out. In all cases, its vapour resistance is greater than 0.06MNs/g, so it can never be classed as a breather membrane. Its function is to allow some breathability from the wall when it is needed, but it is always a vapour control layer

    • Does it work in only one direction?

      No, Procheck Adapt has the same vapour resistance from either side. It is easiest to apply it by unrolling it onto the wall. It is also transparent, which makes it easier to see where to fix through.

    • How airtight is it?

      The membrane is fully airtight, achieving an air permeability of 0.00 m³/m²h at 50 pascals. It is also certified as a Passivehouse Airtight component. To ensure airtightness, it is used with Wraptite Tape, which is a vapour permeable, airtight tape.

    • Can it be used in retrofits?

      Yes, if used on solid stone constructions, which many properties are, it allows the masonry some permeability while protecting it from the vapour pressure generated in winter months (when the vapour drive is greatest). This means that the masonry is still able to dry, if the VCL is paired with a vapour permeable insulation. Using a vapour impermeable strategy to insulate solid masonry walls could lead to moisture accumulation, for example if moisture is pushed into the wall by driving precipitation and solar radiation. With no insulation strategy, it would simply pass into the room and be redistributed by natural ventilation. If the insulation is impermeable or if a standard vapour control layer is used, this could cause a build-up of moisture on the internal surface of the masonry. If the insulation is vapour permeable, this moisture would instead permeate through to condense on the back of the VCL. The entire construction would need to offer some permeability to offset this. Procheck Adapt would offer this permeability, while also preventing most of the water vapour from inside from permeating into the wall.

    • Does it offer any advantage on framed buildings?

      It does. Procheck Adapt serves as a regular vapour control layer, but also allows any moisture (for example, from the construction process, or to reduce damage from leaks) which may have infiltrated the construction to move back into the room.

    • Is it difficult to work with on site?

      It is no more difficult than a standard reinforced polythene membrane. It can be cut with a knife or scissors, and is installed using a temporary double sided tape such as our Probond tape, through which fixings appropriate to the substrate hold it in place. Wraptite Tape is then applied over laps and around edges.

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