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VAPOUR CONTROL LAYER MEMBRANE

vcl-membraneVAPOUR CONTROL LAYER

VCL stands for Vapour Control Layer and is designed to be installed on the warm side of the insulation to limit the transfer of moisture to the building fabric and to aid air tightness in roofs and walls. In fact, it controls the amount of water vapour that can pass through it and manage condensation risk. It means it allows only a small amount of water vapour through from either direction. That way a very small amount of water vapour can pass both ways through the VCL depending on the weather conditions as this will avoid trapping moisture within the structure. A VCL material is always used as close to the inner face of a wall as possible and reduces the amount of moisture passing through the layer to low levels, ensuring only insignificant amounts of condensation occurring within the structure. A VCL in conjunction with the correct use of ventilation and membranes will effectively eliminate the risk of interstitial condensation. An advantage of the VCL is that it will help prevent installed insulation getting damp and losing its thermal properties. A VCL can also help prevent the occurrence of damp and mould, which can also cause structural problems, weakening timber framed buildings and corroding other construction materials. Additionally, this will allow moisture that is driven towards the interior in the summer months to slowly pass back inside the building. This prevents the conditions for mould forming and ensures the longevity of the structure. They should be used to form a continuous airtight layer and so all the joints and any penetrations must always be sealed with the appropriate airtightness tapes. Without good levels of airtightness the VCL does not work and moisture levels cannot be controlled inside the structures. Some of the terms used under the banner of VCL include: vapour check, vapour permeable membrane, vapour retarder, vapour diffusion retarder and variable diffusion membrane. The thickness of VCLs ranges from a simple single layer polythene VCL at 500 gauge, which is 125 microns or 0.125mm thick. The latest type of VCL membrane is the 'intelligent' membrane that can vary their vapour resistance and adapt to changes in humidity conditions. When internal humidity levels are high, the membrane will be vapour closed. This prevents water vapour in the humid air passing through the membrane and condensing. When the humidity level in the building drops past a certain point, the membrane changes to a vapour open state, allowing the escape of any trapped water vapour. Even when the membrane is in a vapour open state, the membrane remains airtight. A quick online search for ‘Vapour Control Layer’ will turn up an extensive list of products, many with fancy technical names, however to make things a little simpler, we can put products into 6 main brands. The most popular brands of VCL membrane are Novia, Visqueen, Proctor Group, Delta, Klober and DuPoint Tyvek. All rolls come in multiple roll sizes such as 4m x 25m, 1.5m x 50m, 1.6m x 50m and 2.7m x 50m. 

VAPOUR CONTROL LAYER INSTALLATION

When fitting a VCL, you need to ensure that you don’t puncture the layer itself. You can use screws to fix your VCL to timber so long as they go through the joists and not the actual layer. Using staples to fix your VCL follows the same principles as using screws. After the VCL has been screwed, the edges may still need to be taped appropriately. Duct tape is not an appropriate substitute for vapour tape and should not be used when fixing a VCL. Vapour Control Layers are sealed using one of our double-sided butyl tapes, using a minimum overlap of 150mm.
 

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Brand: Low-E™ Model: Low-E Seam Tape
Low-E Seam Tape (Scrimmed) is an original pure aluminium reflective foil tape with superior adhesion and Class 1 Fire Rating used as system closure tape with Low-E Foil Insulation products. The roll measures 65mm wide and 45 meters long to provide excellent adhesion and quick stick. This tape ..
  • 65mm Low-E Seam Foil Tape (Scrimmed)
  • Original pure aluminium reflective foil tape
  • Superior Adhesion and Class 1 Fire Rating
  • System closure tape for Low-E Foil Insulation products.
  • 45 meters long to provide excellent adhesion and quick stick
£ 34.21
Ex Tax:£ 28.51
Estimated delivery: 2-3 working days
Brand: Low-E™ Model: Low-E SlabShield 15m2
Low-E SlabShield Reflective Foil Insulation VCL is an innovative interlocking 11mm thick air infiltration barrier and vapour barrier designed to boost thermal performance, in one simple to install product that can be used for under concrete slabs both with, and without, hydronic heating systems. ..
  • Low-E SlabShield Reflective Foil Insulation VCL 15m2
  • Innovative interlocking 11mm thick air infiltration barrier
  • Vapour barrier designed to boost thermal performance
  • SlabShield Foil Insulation Low-E Vapour Control Layer
  • Lightweight and cuts easily with a utility knife or scissors
£ 157.91
Ex Tax:£ 131.59
Estimated delivery: 2-3 working days
Brand: Low-E™ Model: Low-E Ultra-E VCL 15m2
Low-E Ultra-E VCL Reflective Vapour Barrier Foil Insulation is a superior thermal resistant 11mm thick Vapour Control Layer made using recycled closed cell foam core and pure aluminium facings to provide a considerable thermal break and greatly reduce noise transmission, while the pure aluminium fac..
  • 11mm Low-E Ultra-E Vapour Barrier
  • Ultra-E Reflective Foil Insulation VCL 15m2
  • Low-E Ultra-E VCL greatly reduce noise transmission
  • Superior thermal resistant Reflective Foil Insulation VCL
  • Vapour Control Layer - reflect up to 97% of radiant heat
£ 188.82
Ex Tax:£ 157.35
Estimated delivery: 2-3 working days
Brand: Novia® Model: 500 Gauge VCL
Novia 500 Gauge Vapour Control Layer AVCL is a high-quality, single-ply, non-laminated, virgin-grade blown polythene 125 micron material that is suitable for use in residential timber frame applications. Basic grade of CE approved virgin grade polythene vapour barrier comes in 2.7m wide and 50m l..
  • Air-leak barrier and vapour control layer (AVCL)
  • Virgin-grade, high-quality material
  • CE approved and CPR compliant
  • Minimizes interstitial condensation
  • Improves the insulation performance
£ 121.92
Ex Tax:£ 101.60
Estimated delivery: 2-3 working days
Brand: Novia® Model: STRP Reinforced VCL 100m2
Novia STRP Vapour Control Layer is a highly-durable, flame and tear resistant reinforced multilayer polythene laminate used as a vapour control layer within metal profile clad industrial buildings, education sector and commercial properties. Reinforced Vapour Control Layer can be used in any insu..
  • Reinforced Vapour Control Layer - 100m2
  • Translucent, reinforced polythene vapour barrier
  • Suitable for use in commercial cladding systems
  • Helps buildings meet the requirements of BS EN 5250
  • Water vapour resistance (minimum): 1000 MNs/g.
£ 287.18
Ex Tax:£ 239.32
Estimated delivery: 2-3 working days
Brand: Novia® Model: VC2 AVCL 75m2
Novia VC2 is an innovative, flame resistant, scrim reinforced and airtight vapour check membrane for use in insulated walls, floors and roofs. Air Leakage and Vapour Control Layer is a extra tough material providing good tensile and nail tear strength. It is lightweight and easy to handle and ..
  • Air-leak barrier and vapour control layer (AVCL)
  • CE approved and CPR compliant
  • Complies with BS EN 13984
  • Flame resistant to EN 13501-1, class E
  • Helps buildings meet the requirements of BS 5250
£ 176.12
Ex Tax:£ 146.77
Estimated delivery: 2-3 working days
Brand: Novia® Model: 1000 Gauge VCL
Novia 1000G Air-leak Barrier and Vapour Control Layer AVCL is a high-quality intermediate spec single-ply, non-laminated, virgin-grade blown polythene 250micron, 1000 gauge material that is suitable for use in residential timber frame applications. Medium grade of CE approved virgin grade polythe..
  • Air-leak barrier and vapour control layer (AVCL)
  • Complies with BS EN 13984 - multi-folded in 4 x 25 m
  • Virgin-grade, high-quality material - Low cost solution
  • CE approved and CPR compliant - Helps buildings to meet BS 5250
  • Medium grade of CE approved virgin grade polythene vapour barrier
£ 166.08
Ex Tax:£ 138.40
Estimated delivery: 2-3 working days
Brand: Novia® Model: STRP PRO Reinforced VCL
Novia STRP PRO AVCL is a high-spec strengthened and foil laminated polythene vapour-control membrane used in insulated wall, roof and floor applications, including warm flat roofs where high concentrations of moisture vapour need to be controlled. STRP PRO is a highly-durable tear-resistant membr..
  • Helps buildings meet the requirements of BS EN 5250:2011
  • Air-leak barrier and vapour control layer (AVCL)
  • STRP Pro High Performance Reinforced Foil VCL - 80m2
  • For use in metal profile clad industrial buildings, the education sector
  • For use in commercial properties, can be used in any insulated building construction
£ 282.86
Ex Tax:£ 235.72
Estimated delivery: 2-3 working days
Brand: Novia® Model: VC200 Reflective AVCL 75m2
Novia VC200 Reflective Air Leakage AVCL is an innovative, highly reflective airtight with low emissivity surface vapour control layer which helps to prevent interstitial condensation problems and boost the insulation performance. Its 95% reflective surface will help to keep the building warmer in..
  • A highly reflective airtight vapour-control layer (AVCL)
  • Delivers improved thermal resistance (R-values)
  • Delivers improved thermal transmittance (U-values)
  • CE approved to BS EN 13984 - Low moisture permeability
  • Helps buildings to meet the requirements of BS 5250
£ 151.06
Ex Tax:£ 125.88
Estimated delivery: 2-3 working days
Brand: Novia® Model: 1200 Gauge VCL
Novia 1200G Air-leak Barrier and Vapour Control Layer AVCL is the highest grade single-ply, non-laminated, virgin-grade blown polythene 300 micron, 1200 gauge material that is suitable for use in residential timber frame applications.  Finest specification of CE approved virgin grade polythene va..
  • Air-leak barrier and vapour control layer (AVCL)
  • Complies with BS EN 13984 - multi-folded in 4 x 25 m
  • Novia 1200 Gauge (300 micron) Virgin Grade Polythene VCL
  • CE approved and CPR compliant - Helps buildings to meet BS 5250
  • Highest grade of CE approved virgin grade polythene vapour barrier
£ 170.48
Ex Tax:£ 142.07
Estimated delivery: 2-3 working days
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