45 Incl. Key Features • Vapour Resistance 533 MNs/g. Novia 500G Vapour Control Layer Polythene AVCL ǀ 135m2. For a shed/office, 500g polythene sheeting would do (the proprietory products are more expensive). x 210 ft. VAT £73. VCL Visqueen Fully Bonded Vapour Barrier Declaration of Performance. 1 Perms IMP or less to be considered “impermeable. Add to basket. The woven extruded polypropylene multifilament scrim reinforcing provides improved nail tear resistance. £33. Vapour Barrier. Here are four tangible benefits to air barriers: 1. 125 mm Width: 2500 mm Weight: 5. 4% in 2022. " We recommend a heavy duty 500G (polythene gauge) / 125m u (micron thickness) polythene membrane for the vapour barrier, green/clear so that you can see any markings made below. For instance, the vapor barrier could be damaged if placed directly behind plasterboard and when later on holes are drilled or screws are inserted. NEW 3M™ Air and Vapor Barrier 3015NP provides building protection that installs quickly and easily even under extreme conditions without sacrificing performance. Product Code: 527793. A strong reinforced polyethylene vapour control layer with good vapour resistance. g. 00 14' x 140' roll 10 Mil vapor barrier cost: $311. Prestige Building Supplies > Everyday Essentials > Dust Sheets & Protection > Drop Sheets > 125mu Vapour Barrier Green 4m x 50m(500g) 125mu Vapour Barrier Green 4m x 50m(500g) /unit . 45mx50mx125mu (500 Gauge) is manufactured from recycled polythene to meet NHBC standards. With a vapor barrier, moisture can get in, but cannot get out. Using enhanced technology, Novia has created a highly reflective vapour control layer suitable for use in insulated wall, roof and floor applications. Block the effects of moisture and humidity with this Garde Climat vapour barrier with a thickness of . If heavy equipment will be operating on the vapor barrier or if the vapor barrier will be installed over an angular subbase, a minimum of 15 mils is recommended. 59630: 4. 08. AirGuard® Reflective Vapour Control Layer 1. A vapour barrier, on the other hand, is a damp proofing product attached to a wood floor underlay to reduce moisture passage. This product. Visqueen Vapour Check restricts the passage of warm, moist air from within the building from permeating into the structure or the roof. x 10 mil Yellow Guard Vapor Barrier. We have our own in-house delivery fleet of FORS Gold vehicles with Moffett mechanical off-loads delivering nationwide. 5m. 5 mm). Scenario 3: plastic on the outside, cold weather. It is suitable for use as a type of damp proof membrane as defined by BS EN 13967: 2012. Ensure air tight seal. This Polythene Vapour Control Layer (VCL) 500g (Green) is a single-ply, non-laminated, virgin grade blown polythene material. £6369 CE Marked to EN13984 For use within wall, roof and floor construction Damplas Vapour Barrier is intended for use within structures to prevent the penetration of. This is actually an oversimplification of the scientific reasoning on the placement of a vapour barrier. 125mu/500g: £48. Add to wish list. Video of the Day. 41. £ 49. Made in the UK from recycled polyethylene. 56 incl VAT. 82 incl VAT. Let’s take a look at how these membranes function. Thankfully, the solution to this is known as a vapor barrier. ft. Block the effects of moisture and humidity with this Garde Climat vapour barrier with a thickness of . Rust Remover Soak $ 34. The wider the tape used, then the stronger the seal will be, so choose a tape based on. Building materials are going to wick moisture, some more than others, but all will to some extent. Damage from water condensation due to water vapour. Cut extra sections of the vapor barrier to fit the edges and corners of the walls, as well as any piers or columns. £78. Free delivery over £250 (Exceptions Apply) Next Day Available | 30 Day Return Policy. Are membranes the only way of achieving a VCL? There are other ways of achieving a vapour controller such as: OSB (orientated Strand Board) - but these vary in their permeability and airtightness so would need to be checked. Reduced convective heat losses. What is the difference between a vapor barrier and a vapor retarder? For the purposes of construction, this is only a difference in terminology. Procheck 500. 5m at Screwfix. To provide an airtight seal, it must be installed in conjunction with the Novia two-tape sealing system. This strong 100% airtight vapour barrier is specially designed to give maximum thermal performance. Well, vapour barriers are installed in order of preventing such water from penetrating through the walls or ceilings, get inside and damage your plasterwork and in time the whole construction. Used within wall and roof applications. When condensation builds up in properties it can lead to the development of dampness, mould and rot, which can cause both structural and health issues. For air, the pressure difference. They help to seal the building envelope – for optimal airtightness, energy efficiency, long-term performance and durability. Keep in mind, residential foundation characteristics can vary by region and project, but termination points usually include the perimeter of the slab placement area, like at a concrete stem or basement foundation wall. By controlling heat transfer and reflecting heat inside the building, they help keep buildings cool in summer, and warm in winter. " I'm guessing by "marking below" he means any markings I place on the PIR to show (for example) where I don't want pipework. They do this for two main reasons: to prevent moisture from the soil permeating up through a slab and into a house (also known as rising damp); and. The old school in me says put the vapor barrier to the interior, but when insulating a floor and adding an inch of foil-faced polyiso with taped seams under the floor joists, the vapor barrier (as well as air barrier) is at the. s. FUNCTIONALITY: WATER VAPOR AND AIR TIGHTNESS Water vapour transmission (sd) EN 1931 m 5 2 8 Density of water vapour flow rate (g) EN 1931 kg / (m² s) 0,8E-7 0,5E-7 2,04E-7 Temperature resistance - °C - -40 +80 Durability (exposure to artificial ageing) Water vapour transmission properties EN 1931 pass / no pass pass - -Product Description. Additional information. Product details Length: 20 m Thickness: 0. The most successful moisture management strategies combine high-performance fiber glass cavity insulation with a vapor barrier, a water resistive barrier, an interior air barrier and. Add to basket. Vapour barriers are sheets made from plastic or foil, used as a method of waterproofing a building and preventing the influx of interstitial condensation. Vapour Tape. - Sell the Stego Wrap brand of vapor barriers. . roll Product: DecoShield 9" Air/Vapor Barrier TapeApply 3M™ Air and Vapour Barrier 3015NP in temperatures as high as 66 ℃ (150 ℉) or as low as -18 ℃ (0 ℉). Vapour barriers can also improve the energy efficiency of your home. 2" sand. Visqueen Fully Bonded Vapour Barrier is a foil lined modified bitumen rubber membrane with a self adhesive coating protected by a removable polyethylene release film. › See more product details Capital Valley Plastics Ltd Vapour Barrier Green 300ga 20m x 2. (eg breathable roof underlays and air leakage barriers), BS 1521 does not give guidance on suitable use, and as such this product is a generic material, serving a wide range of end-user defined applications. Weight/m2: 0. If that air has a high moisture content, then this can spell trouble as it will condense inside your walls at night. £ 117. Only use materials which are VCM Class 1 to AS/NZS 4200. The woven, polypropylene, multifilament scrim reinforcement provides good resistance to tears and punctures. £122. 94 kg Material: Recycled Polythene Colour: Green Coverage: 50 m2 Pack Quantity: 1. Positioned within the range of 500G and 1200G membranes, this VCL with a medium specification fully complies with CPR standards and holds CE approval as a dependable vapour control layer. Building Services Australia provides tough, puncture resistant concrete vapour barrier and membranes for critical sub-structures and civil works. Visqueen Vapour Barrier. A vapor retarder is defined as a material that reduces the rate at which water vapor can move through a material, according to the US Department of Energy. Moisture in the indoor air can condense on cold surfaces in your basement, forming. There is more to it than vapour barrier. The product is black or blue in colour and available in three thicknesses: 0. 00 incl VAT. £0. £ 43. 006-in T x 59-ft L x 102-in W. April 15, 2011. Protect your buildings from mildew, staining and frost damage caused by interstitial condensation using this vapour barrier from Damplas. A vapor barrier is not typically intended to retard the migration of air. 1. Currently in Stock. Uses Vapour barrier is applied over most common substrates such as concrete, metal decks, plywood, timber boards and/or oriented strand fibre board (OSB) deck. £ 69. ) 1)The vapour barrier shall have sufficiently low permeance and shall be positioned in the building component or assembly so as to a) minimize moisture transfer by diffusion, to surfaces within the assembly that would be cold enough to causePERMINATOR TAPE is a self-adhesive tape, used in conjunction with the application of PERMINATOR underslab vapour barrier. Learn how the work and why they're essential. A well-installed air barrier controls both the flow of air. 18+, T&C apply, Credit subject to status. VAT. 22, 2022 (GLOBE NEWSWIRE) -- Future Market Insights (FMI) has anticipated the demand of Vapour Barrier Market to witness a year over year growth of 4. The underfloor heating vapour barrier should be laid on the top of the insulation and sealed at the edges, this also forms a seal eliminating any of the warm screed floors coming in contact with the cold concrete sub-floor, should the. 23kg roll weight. ft. Prevents ingress of moisture into un-ventilated voids. 004 to 0. Visqueen High Performance (HP) Foil Lined Vapour Barrier is used to omit the risk of interstitial condensation within a structure as well as improving the general airtightness of the building. Similarly vaportight barriers can be used to segregate classified buildings from adjacent non-hazardous locations. Complete range, complete solution. 500g ; 5mm ; show 2 more show. Add to wishlist Compare product. Visqueen 300mu Damp Proof Membrane 25 x 4m Black. The job of a vapor barrier is to prevent vapor diffusion, and the job of an air barrier is to stop air leakage through differences in air pressure. 7m x 50m Roll. Vapor barriers are classified by their vapor permeance, or perm rating, which is a measure of the rate of moisture diffusion through the material. (0) Details. Metallised BOPP tape. Knowing that vapor barriers are an effort in futility in a van, the relative humidity inside of your van will eventually make its way to the inside of your walls through tiny gaps and convection. Product code: 153230. The vapour permeance of the new generation appears to be slightly less than the previous one. Vapour barriers (also known as vapour retarders) describes the layer used in damp proofing to stop or limit the amount of moisture that can travel through the walls, flooring, or ceiling. £129. 25 excl VAT. Buy Tufreel Polythene Vapour Barrier. Vapor Barrier. VAT £62. Configuration: Multifold. 43 inc. 77 Incl. Product Code: 9000270452. Product Overview. A vapour barrier membrane offers great energy efficiency and insulation, while also acting as a robust type of damp-proof membrane. 59. Change settings. 37 per m2. Vapour Barrier also restricts the movement of warm moist air and i. For each, the driver is pressure difference – both air and vapour will move from an area of higher pressure to an area of lower pressure. 4m x 50m x 500g (200sqm) Black Polythene Vapour Control layer For use within wall, roof and floor construction Vapour Barriers are used within structures to prevent moisture from penetrating the surface of the structure and to improve its airtightness. Firstly, the vapor barrier should always be installed on the warm side of the wall. SKU: FNPYF609. com Return Policy: Regardless of your statutory right of withdrawal, you enjoy a 30-day right of return for many products. 2mm 3in1 Construction. 1m for easy handling. It prevents moisture from causing rot and mold inside the walls and ceiling. GEE-FIX Vapour Barrier Coating 20L 30-80 UAE. The 500ga Green Polythene Vapour Barrier 4m x 50m prevents moisture damage and mould by. Limited vapour transmission. Learn more. Ask a question. The two most commonly used thicknesses are 300um and 200um. 1). VAT. Class III – The vapor barriers are permeable, making them the lowest forms of moisture barriers. Product Description. Beyond its adept moisture management capabilities, the Novia 500 serves as a highly effective barrier against air leakage, efficiently thwarting. Long term moisture barrier DESCRIPTION FEATURES & BENEFITS: LIMITATIONS: RECOMMENDED FOR: Henkel Canada Corporation Professional and Consumer Adhesives Phone 1-800-624-7767 Fax (440) 250-9661 PL® ACOUSTI-SEAL Vapour Barrier & Sound Reduction Adhesive Item # Package Size. Putting spray foam to seal the celotex to the panels. The thermal control layer is also called insulation. Visqueen Gas Barrier is a multi-layer reinforced polyethylene gas barrier with a 20 micron aluminium foil. 42. So if you keep a dehumidifier running, it keeps the air dry. So when building a warm roof, you should have a vapour barrier underneath (= room side or warm side) the insulation, so that vapour from the room can't go past the insulation, where it would get cold and condense into water, and drip back into the room. Novia Vapour Control Layers are sealed using one of our double-sided butyl tapes, using a minimum overlap of 150mm. 500g Polythene vapour control layer / air leakage barrier fixed to studs behind plasterboard linings. Strong and durable, they will not rip or tear easily. The woven extruded polypropylene multifilament scrim reinforcing provides improved nail tear resistance. Wickes Green Polythene Vapour Barrier - 2. Vapor Barrier + Air-Con = Damp Moldy Walls. The BS 1521 grades are normally taken to be A1F, B1F and B2, or variants such as FF1 Foil Faced Building Paper or Polybit Building Paper. ; So, in conclusion VCL’s. This product also performs the additional function of an air-leakage barrier, to prevent losses due to unwanted. It is made mostly from recycled paper, and includes a fiberglass reinforcement grid. Duchesne Ultra-Plus Vapour Barrier Film - Polyethylene - Clear - 1,500 sq. 7m wide and 50m long rolls. 5 x 20m. Folded For Ease Of Handling. Email: [email protected] Green Tint Vapour Check is manufactured from high quality virgin materials to achieve high tolerances. The vapour barrier prevents the warm air or water vapour from penetrating through the wall to where it might reach its dew point – when it turns back into a liquid. Three sizes are available from stock: 15mm x 22. Quantity: FREE Click & Collect within 30 minutes. 5. pdf. View all: Capital Valley Plastics Ltd Membranes & Barriers. 1-877-464-7834. Damp-proof membranes are a versatile product and can be used for a wide range of applications, such as creating a protective. The product has a reflective aluminium finish on the upper surface and a matt aluminium surface on the reverse. VCLs are designed for use on the inside of insulated buildings to manage the flow of water. Moisture from 'the sponge' will evaporate into the cavity. VYCOR® enV-S™ resists damage due to jobsite conditions and wind, resulting in a professional and high-quality job-site appearance to clients and passers-by. £97. VAT. Covers approximately 200m2. However, as alluded to above, the. 25m length x 4m width. 5m x 50m. Inc. An AirGuard® vapour control layer can significantly reduce heat loss and increase energy efficiency. TYVEK® Supro Breather Membrane. For use as an air leak barrier and vapour control layer (AVCL) in insulated wall, roof and floor applications. This elicited a comment from Bill Rose, research director of the Building Research Laboratory at the University of Illinois in Champaign. The barrier is supplied in single wound rolls (not folded), 1. Vapor barriers restrict the flow of water vapor (diffusion) through materials. According to EPA guidelines, installing vapor barriers on the walls and floor of your crawl space can keep water vapor at bay. 00 incl VAT. DB+ is a less expensive, paper vapor retarder made by Pro Clima that varies in permeance from 0. A: A damp proof membrane (DPM) is a thick plastic sheet used as a waterproof barrier between a concrete subfloor and wood floor. 4 x 25m area 125mu/500g thickness. 2. VC200 Reflective helps to prevent interstitial condensation problems, and is also. Allowing the fans (s) to keep a negative pressure on all parts of the crawl space floor and eliminating any "pockets" that seep the gas into the space. Labelled and registered for traceability. , and Twin Maple Group have been collaborating to research the use of the aluminum reflective foil insulation as replacement for vapour barrier in wall building systems. 6 mil poly can work effectively as an air barrier if it is carefully sealed, but so can other materials. Product code: P1-1206 MPN: Novia 500G Vapour Control Layer Colour: Translucent green tint Length: 50m Material: Blown polythene Thickness: 125 microns ǀ 500 gauge Weight:. This product also performs the additional function of an air-leakage barrier, to prevent losses due to unwanted convection flows. 5m, 30mm x 30m and 50mm x 10m. 125mu (500G) Green Vapour Barrier 4m x 50m (200m2/Roll)< Back to Membranes & Barriers; Capital Valley Plastics Ltd Heavy Duty Polythene Sheet Clear 620ga 4m x 3m (20738) 620 gauge, heavy duty, clear polythene sheet. Novia VC200 Reflective is the latest addition to the Novia vapour control membrane range. A lap-seal is then applied on top using either one of the foil tapes or metallised BOPP tape. ft) CGSB Approved 6 mil Vapour Barrier. It is suitable for use as an air leakage barrier and vapour control layer in insulated walls, roofs and flooring. A highly vapour and water-resistant low emissivity internal vapour barrier, it considerably reduces interstitial condensation as well as improves thermal efficiency by reflecting up to 95% of radiant heat. It is designed for use as an air leakage barrier and vapour control layer (AVCL) in insulated wall, roof and floor applications. Novia Vapour Control Layer - 1200 Gauge Vapour Barrier - 4M x 25M. 2m x 10m Roll £93. Capital Valley Plastics Ltd General Purpose Sheeting Clear 150ga 25m x 4m (71880) Roll-folded into 1. 1000 gauge/ 250 micron (nominal) material thickness. There is a lot of debate about whether to put a vapour retarder (vapour barrier) on an insulated wall behind shower tiles. Fax: 01254 681235. /0. FREE SHIPPING. ★★★★★. So what makes a vapour barrier. Photo courtesy Jon Riley / Casco Bay Insulation. 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. £87. All vapour control materials should come with an approval certificate or under EN13788 must be specified by condensation risk analysis. The kit has been put together by Novia with all the materials and fittings needed for your DIY project. 18+, T&C apply, Credit subject to status. Delivery Next day available. 1 perm or less. We have housewrap outside the exterior plywood sheathing and will install 1" rigid foam prior to a rain-screen and then Hardie siding. Vapour Barrier is manufactured using virgin polyethylene. Add to Basket. 1 perms. 53. Read more. The permeance is as low as 0. typical usage for A1F has. £48. Vapor barriers are designed to prevent water absorption and retard the passage of moisture vapor from the atmosphere to the insulated surface. [8] Air is mixed with water vapor. Commerce House, Festival Park, Stoke-on-Trent, ST1 5BE, United KingdomStego Installation Support. Membrane can be left exposed to UV rays. 00 incl VAT. These membranes are important building components, preventing water vapour from entering areas where it can condense, can often lead to the growth of mould, mildew and rotting. 62. All vapour control materials should come with an approval certificate or under EN13788 must be specified by condensation risk analysis. S. 2. TrustSEAL Verified. Division B:Acceptable Solutions Part 9 – Housing and Small Buildings British Columbia Building Code 2018 Division B 9. Vapour Barrier Membrane 500ga. 41. Vapour Barrier Properties and Installation (See Note A-5. Pieces in Pack/Case. Powerlon VCL 170 Air and Vapour Control Layer - 2m x 50m Roll. Add to basket. Ends: 30 Nov 2023 23:59. VC200 Reflective helps to prevent interstitial condensation problems, and is also. 00 – $ 39. Additional information. Sitting between the 500G and 1200G membranes with regards to thickness and quality, the 1000G Polythene remains fully CE Approved as a vapour control layer. Complies with BS EN 13984. This product also performs the additional task of an air-leakage barrier, to prevent losses due to unwanted convection flows. Abstract and Figures. View all: Capital Valley Plastics Ltd Membranes & BarriersVisqueen Single Sided Vapour Tape, 50mm x 15m VisqueenPro Double Sided Vapour Tape, 20mm x 50m Visqueen Double Sided Vapour Tape, 20mm x 50m VisqueenPro Single Sided Vapour Tape, 75mm x 15m VisqueenPro Vapour Edge Tape, 150mm x 15m Visqueen FR+ Vapour Tape, 75mm x 25m Visqueen FR Vapour Tapes Visqueen A2. To provide an airtight seal, it must be installed in conjunction with the Novia two-tape sealing system. by GCP Applied Technologies. 2m x 50m long. 9′ X 100′. in accordance with the design. Nominal Width: 4m. Configuration: Multifold. This is the function of air barriers. Add to Cart Get Best Price Add to Wish List. Its purpose is to help prevent water vapour from reaching building walls, ceilings, attics, crawlspaces or roofs, where it can condense and cause building materials to rot or grow mould. Chemical Resistance Consideration If a vapor barrier is being used under a slab to control vapors at a brownfields site, the chemical resistance of the vapor barrier must be considered. Vapour barriers are the black (or orange) plastic that builders put under residential house slabs. Durable material: our. That means that if you live in a cold northern climate where you have more heating days than you have AC days, your vapor barrier should be on the inside of the wall assembly (just beneath the drywall). Using Tapes with Novia Vapour Control Layers. 1 to 0. ★★★★★. The same applies to walls, but a warm roof is an easy example. Weight: 15. Step Seven: Insulate the Bond. Roll Length: 50m. A lap-seal is then applied on top using either one of the foil tapes or metallised BOPP [email protected] AED. Novia 500 VCL is a low-cost, blown polythene material, suitable for use as a vapour control layer within the Walls of Timber frame constructions, or where control of the passage of water vapour is required. This reduces the risk of harmful interstitial condensation by ensuring that any moisture within the. Visqueen Urban Drainage Geomembrane Double Sided Tape 50mm x 10m. Maintains insulation performance by up to one third. Effective vapour control barrier. The drywall won't stop the moisture like a vapor barrier, it will move through it. They help to seal the building envelope – for optimal airtightness, energy efficiency, long-term performance and durability. The drywall will absorb the moisture, but like any materials in a home, the drywall will assume the same relative humidity levels as the basement. Glidevale Protect VC Foil Ultra VCL & Air Barrier with Lap Tape - 1. So here's a little known fact that most HVAC installers won't tell a potential new client for central air; Polyethylene vapor barriers in combination with air conditioning in homes can rot walls because of the condensation they may cause. It restricts the. Backed by unparalleled project and educational support, Stego 15-Mil. Length: 50000mm. 00 ex VAT. This saves you money. Vapour Barrier. 94m2 Pack. 31 in Vapour Barriers: Date First Available : 8 Oct. The Visqueen 300mu Damp Proof Membrane (DPM) 25 x 4m (L x W) in a roll is manufactured from high quality reprocessed low density polyethylene to prevent moisture penetration from floors. 1 and 1. Protect your buildings from mildew, staining and frost damage caused by interstitial condensation using this vapour barrier from Damplas. Often called "smart" vapor retarders, these products are made from plastics whose vapor permeability changes with humidity. 41. 00 Perms, which implies nothing can get through. Add to Basket. 4m L50m 125mu/500g. Add to basket. 45mx50mx125mu (500 Gauge) is an effective vapour barrier to ensure walls are resistant to water and moisture and prevent damp transmission through walls. There are several examples in both API RP 500 and API RP 505 where vaportight barriers are used to limit the migration of flammable gas and/or vapors from a classified enclosed area into the surrounding area. At just 100 sq. With a pre-attached self-sealing tape strip and plastic overlap, installation is a breeze! Suitable for wood and cement subfloors. Novia VC4000 FR Reflective is suitable for applications requiring EN 13501-1 fire approval *, such as those over 18m in height. Step 3: Seal the Perimeter. climates, vapor barriers, or -- more accurately -- vapor diffusion retarders (vapor retarders), should be part of a moisture control strategy for a home. The seams must be sealed with tape and the edges of the foil should overlap a little (a few inches). A vapor barrier can act as a very effective air barrier, but an air barrier does not (and should not) always stop vapor. The code has not historically been specifically clear on this so we get lots of different interpretations. Well-sealed drywall in itself makes a great air barrier. Class 2 vapor retarders include extruded polystyrene, 30-pound asphalt-coated paper, plywood, and bitumen-coated kraft paper. This polythene film is a great choice for use on external walls and ceilings, under concrete slabs and foundations. Free delivery on orders over £60. The cost of installing vapor barriers can vary depending on your crawl space’s size, the damage’s extent, and the materials used. The U. Novia Vapour Control Layer - 1000 Gauge VCL - 4M x 25M. The function of a vapor barrier is to retard the migration of water vapor. 2mm in thickness to effectively create a moisture. ROLL. g. VAT. Versatile application - used within floor, wall and roof constructions. Visqueen High Performance Damp Proof Membrane. COMPOSITION: Stego Wrap 20-Mil Vapour Barrier is a multi-layer plastic extrusion manufactured with only the highest grade of prime, virgin, polyolefin resins. A vapor barrier can help keep moisture out. (68) Questions & Answers (52) Hover Image to Zoom. Product Details. 8. 3. Product Overview. A strong reinforced polyethylene vapour control layer with good vapour resistance. The NCC requires a vapour barrier be a nominal 0. Low-E Ultra-E VCL Reflective Vapour Barrier Foil Insulation is a superior thermal resistant 11mm thick Vapour Control Layer made using recycled closed. NHBC Standard 6. Read full Product Description. Product Width. VAT £ 0. Article #2264002. 5 perms at high humidity. Novia Vapour Control Layer made of a 500 gauge VCl made of virgin grade blown polythene material for superior vapour control and air barrier. Product Type. 5 x 20m. 17 £95. 5' Wide For Easy Installation ; Folded For Ease Of Handling ;. 12 Each. The cool surface is the sheathing, assuming no exterior insulation.