Vapour barrier wickes. 5 x 20m; Customers' gallery. Vapour barrier wickes

 
5 x 20m; Customers' galleryVapour barrier wickes  A breather type wall underlay should almost always be installed in walls in New Zealand, not a vapour barrier

The Wickes range of British Gypsum bagged plaster has been created to cover most plastering finishes and backgrounds. 1 perm or less. £22. We have gone for the double bubble variety which is. Suitable for use with sub-floor embedded, and surface underfloor. Wickes Green Polythene Vapour Barrier - 2. 15. Needs external vapour barrier (difficult & takes longer time for installation Increase in Thermal Conductivity ‘λ’ over a period of time is very high Low ‘µ’ Value (200). 4. Please enter a valid postcode. Improves the efficiency of thermal insulation & reduces energy consumption. DUCHESNE. 19 per m², £22 per pack | Buy now from Wickes. Cellulose. The cool surface is the sheathing, assuming no exterior insulation. Project Source. Existing air and vapour barriers. ★★★★★. S. All sizes can be sourced from popular building merchants such as Wickes, B&Q, Selco. • Helps protect your floor against moisture. Additionally, unless it is protected by a VCL, this could damage the floor insulation. Class II vapor barriers have a vapor permeance of between 0. £28. Their metallic surface enhances thermal comfort by reflecting heat back into a building, improving insulation in winter and reducing solar gain in summer. NOT absorbent. Damp-Proof. An effective vapour. 8m. Plasterboard with a foil backing is suitable for external walls, pitched roofs and as additions to all wall and ceiling linings where vapour is a problem. The requirements in the code can be used for wood framed structures with temperature and humidity conditions typical of residential occupancy. (I'm guessing that your house is in Canada, where the polyethylene vapor barrier still enjoys respect and legal protection. 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. The solid materials of the floor can serve as the air and. To give you an idea of how thick that is, here are some every day items you would encounter, and their thickness: — Stretch Wrap: . 98. Delivery Next day available Quantity: Product added for Click & Collect. Made from bonded plastic or textiles, this handy roll of material is laid underneath topsoil to prevent weeds from growing through. This. Attach wooden battens to the van. adequately fixed to the warm side of the insulation and frame (framing timbers should have a moisture content of less than 20%) placed to cover the external. This extra heavy-duty plastic can be used under concrete slabs as a vapor barrier and on top of freshly poured slabs as a curing blanket. Part of SuperFOIL's next generation of highly specified multi-foils with unrivalled thermal performance, SuperFOIL SF40 is comprised of 37 layers including reinforced heavy duty double-foil outer layers and provides a 3-in-1 insulation solution with radiant barrier, vapour control layer delivering. This approach allows the wall assembly to dry towards the exterior, as long as vapor-permeable exterior materials are used. Measure the length of tape you will require. push flanges of boot between drywall and existing vapour barrier (this was hard as the boot is very big relative to the size of the hole). Vapor barriers and laminate flooring underlayment. Wickes PVCu Soffit Board - 300mm x 3m. (834) £7. vapour . 3. Use a dehumidifier to remove excess moisture. The term barrier implies an absolute which is not possible due to. Common board sizes include the following: 2400mm x 1200mm. Blown into place dry or wet. Air Barrier Systems 9. Designed to be lightweight and space-saving while retaining. Vapor Barrier + Air-Con = Damp Moldy Walls. 13 per m. A vapor barrier can help protect your home’s structural integrity. British Gypsum Gyproc Thermaline PIR Tapered Edge insulated plasterboard 2400mm x 1200mm x 53mm. It requires a topcoat to be durable to water, though the SafePaint formula can take a wet hand on the wall no problem. Maintains Thermal Performance. Used vapour barrier tape to tape the boot to the old vapour barrier. Vapor Barriers For Building Insulation Material, 1200mm To 1220mm ₹ 55/ Square Meter. In most U. (0) Details. A: A damp proof membrane (DPM) is a thick plastic sheet used as a waterproof barrier between a concrete subfloor and wood floor. Always. run wires in through boot and push into wall. Read More. This product is designed to act as a vapour barrier to protect insulation, maintain insulation performance and protect other elements of the building. £0. When it comes to cold storage facilities. Currently in Stock. The VCL also restricts the movement of warm moist air and improves building insulation. Part of SuperFOIL's next generation of highly specified multi-foils with unrivalled thermal performance, SuperFOIL SF40 is comprised of 37 layers including reinforced heavy duty double-foil outer layers and provides a 3-in-1 insulation solution with radiant barrier, vapour control layer delivering a thermal resistance of up to 3. Protective Barrier Film, 1200mm To 1220mm ₹ 40/ Square Meter. View Mobile Number. 80 per m. To sum all up, vapour barriers should be at least 0. Rule #1: Unless you’re building in Canada or Alaska, don’t install interior polyethylene on walls. A 15-mil vapor barrier can be about 25 cents per square foot. £28. This reduces the risk of harmful interstitial condensation by ensuring that any moisture within the. The higher the perm rating or Ng, the quicker moisture can evaporate. In fact, it controls the amount of water vapour that can pass through it and manage condensation risk. Dryrod DPC Kit Standard Wall - 6 Linear Metres (2) £135 . 5mm x 1. PK !z!0: - [Content_Types]. Vapour barriers are the black (or orange) plastic that builders put under residential house slabs. If you’re looking for an alternative. Knauf Vapour Panel has a metallised polyester foil creating an effective vapour barrier to limit moisture diffusion, ideal for lining the internal side of the external walls and underside of roofs and decks. Tyvek® combines the right balance of air and water resistance and vapor permeability. Air barriers can be either vapor permeable (allowing water vapor to pass through) or vapor impermeable. Product code. It helps stop moisture passing from one to the other. 40 per SQM, An effective vapour barrier to prevent moisture transmission through walls which is made from recycled polythene to NHBC standards Use to prevent the passage of water or moisture from within buildings to the timber frame Prevents moisture transmission through walls Made in the UK from recycled polythene Convenient roll size for ease of use Meets the requirements of NHBC 6. The film layer provides resistance to water penetration and regulates the water vapour flow through the roof system. Learn more. Currently in Stock. 2m x 2. NoMorePly 12mm Fibre Cement Construction Board 1200 x 800mm (104) £21. 5m2. 64. Learn how the work and why they're essential. The water-resistant membrane incorporated between the polystyrene and the plasterboard helps to form a vapour barrier and is ideal for when there is a risk of damp. Wickes Wood Fibre Laminate & Wood Flooring Underlay: The best eco-friendly laminate underlay. Preventing the Loss of Conditioned Air. With a consistency similar to that of thick emulsion paint, its. V apour Barrier is intended for use in cont rolling the movement of water vapour th rough structu res, if water vapour is allowed to condense between building elements it can have serious implications for the st rength of sur rounding structural systems and reduce the effectiveness of thermal insulation. Our 6-Mil plastic sheeting is a heavy-duty, multipurpose film for perfect for a wide variety of construction, gardening, and DIY applications, including being used under concrete slabs as a vapor barrier, on top of freshly poured slabs as a curing blanket, and as a temporary cover for heavy equipment and supplies. Superior material conditioning. Figure 3. Material’s permeability can be measured and expressed in perms as a measurement unit which is used to. Vapor is principally transported by air flow not by vapor diffusion. g. 50. Insulation Boards. #1. Trade Select™ VapourTech® Wall is used as a wall wrap behind fibre cement and timber cladding in most Australian climates. Use acoustic spray-foam sealant or sealant tape to. (834). So if moisture does form on the cold surface there. Compliance: BS EN 14190. Cover the staples and any seams with seam tape. Wickes Green Polythene Vapour Barrier x 20m. The gravel provides a better grip for foot traffic when conducting maintenance or repairs. Conceptually, the “air/vapour barrier” was a material purported to address both air infiltration and vapour diffusion issues. Reflectix Foil Tape 2"x150' Our aluminum tape is specifically designed to adhere well to foil. Our Insulation foil is easy to fit and can help save energy and minimise heat loss around your home. 99 Dodo Mat DEADN Hex 20 Sheets. Knauf Vapour Panel has a metallised polyester foil creating an effective vapour barrier to limit moisture diffusion, ideal for lining the internal side of the external walls and underside of roofs and decks. It is supplied in 30m length rolls and the following widths: 100mm, 112. barrier; Knauf Fill & Finish 60 Premium . Use more butyl tape to secure the bottom of the vapor sheet. Suitable for use with sub-floor embedded, and surface underfloor heating. £0. 05 per m. Our flagship fascia board style in anthracite grey, ensuring a neat and tidy look whilst also guaranteeing strength and durability. A wall system should have one vapour barrier, but can have many air barriers. Please enter your postcode to confirm we can deliver this quantity to your address. Reviews . Abstract. For Use With: For Use with Vinyl PlankClear All. effective vapour barrier to limit moisture diffusion Enhanced fire : resistance. 25 inches (13 to 56 mm) in length. 1). 0 perm. Incised Timber Fence Post 75 x 75mm x 1. The minimum thickness for a vapor barrier is 4 mil (0. Knauf Vapour Panel has a metallised polyester foil laminated on the grey paper face, creating an effective vapour barrier. Like concrete, it is usually made of cement, and its purpose is to provide a smooth, flat surface – levelling out the floor. 1. It restricts the. Also acts as a damp-proof membrane. Isolation solutions. Add for Delivery. wedi Vapor 85 Building Board is available in two thicknesses: 12. Vapour barriers (1) Water pump (2) Water repellants (1) Waterproof coating (1) Height Imperial. Division B:Acceptable Solutions Part 9 – Housing and Small Buildings British Columbia Building Code 2018 Division B 9. Vapor barriers are classified by their vapor permeance, or perm rating, which is a measure of the rate of moisture diffusion through the material. 5mm x 1. wedi Vapor 85 Building Board is available in two thicknesses: 12. I used a breathable cheap membrane. 88 per m2. 2 (a) (iii) deepened (as per AS 2870) to extend into the natural soil level with a bearing capacity in accordance with. Drybase® Liquid applied DPM is a single pack barrier coating for above ground use. Quick and easy to install, with no specialist equipment required. When too much water gets into the screed, there will be an increased shrinkage and risk of cracking. 0 perm/inch when tested in accordance with ASTM E96. £. We supply trade quality DIY and home improvement products at great low prices. 3M acrylic adhesive technology allows for primer-free application from lightweight rolls that saves you up to 40% on installation time. 4. Whilst carrying out its first function, it is also keeping the air from. Our Vapour Check Plasterboard is backed with a vapour control membrane. The 219-08 is the only CCMC evaluated method to seal, seam polyethylene vapour barrier film. A wall system should have one vapor barrier, but can have many air barriers. An effective vapour barrier to prevent moisture transmission through walls which is made from recycled polythene to NHBC standards. 1 perms) create a barrier between floor tiles and the finished area. R-value per inch: 3. 1 perm or less, while class II vapor retarders have a rating greater than 0. The purpose of the vapour barrier is to prevent warm air inside the space penetrating into the cold space behind the insulation, and moisture condensing out of it onto the timber, etc. Three classes of vapor control are defined depending on the vapor permeance of the vapor control layer. With a baseline water vapor permeance rating of 0. Where it is located in an assembly and its permeability is a function of climate, the characteristics of the materials that comprise the assembly and the interior conditions. 5 x 20m; Customers' gallery. £195. A vapor barrier behind the hardi-backer or concrete board is SOP today. In cold climates, the primary purpose of attic or roof ventilation is to maintain a cold roof temperature to control ice dams created by melting snow, and to vent moisture that moves from the conditioned space to the attic (ventilation acts to bypass. Our high-quality pad not only enhances the feel of your carpeted floors, but it also boosts your home's insulation by increasing the overall R-Value. 99 CAMPERVAN CONVERSION SPECIALISTS. 99 £49. 1 (R702. At ~3750 HDD-C (about 6750 HDD-F) Pickering is a cool edge of zone 5A or warm edge of zone 6A type of climate in terms of annual HDD and moisture. Makes an effective barrier against air leakage. The final “minor” change to consider is the stucco rendering itself. 2. raiderxx • 2 yr. Product code: 161265. Make 3 payments of £13. Features & benefits. Reviews . Use insulating sheathings over drainage layers installed outward of framing. If the plastic (6 mil min) is not large enough to cover the entire envelope in one piece, it should be installed at the bottom first, overlapped so. 5mm x 2400mm x 1200mm. Get this The Daily Messenger page for free from Tuesday, August 30, 1977 HIGH FLIER Pauline Swttnlewskl, 9, was given VIP treatment by Iberia Illght engineer Adolfo Lozano I. ft ) CGSB Approved 6 mil Vapour Barrier. 2mm in thickness to effectively create a moisture. £26. 1 and are classified as Water Barrier to AS/NZS 4200. Meets Building Code of Canada For In-Wall Vapour Barrier Installation ; CGSB Approved ; Wall and Ceiling Vapour Barrier ; 8. To check you are using the best board for your project or to see the full range of Knauf plasterboards stocked in Wickes please click on ‘Technical sheet 2’ below; Data sheets. Much like the cold roof, it stops the transfer of warm moist air from inside the building into the warm roof layers. Please enter your postcode to confirm we can deliver this quantity to your address. Under slabs or behind. Choose from our range of sizes and see our advice on fitting and finishing. We would like to show you a description here but the site won’t allow us. Drybase White Liquid Damp Proof Membrane - 1L. However, not only are there other kinds of polyethelene housewrap, but there are numerous other. 8m. Thermo Acoustic Liners. co. uk. Sound Deadening. Incised Timber Fence Post 75 x 75mm x 1. Ideal for lining the inside of external walls, particularly when upgrading walls with a low insulation value. VCLs used to be referred to as the vapour barriers, but this terminology has been updated. Reviews . moist warm air condensation glass ponding 6Polyethylene vapor barriers in combination with air conditioning in homes can rot walls because of the condensation they may cause. Features & benefits. ) 12. 5” Comfortbatt® Vapor Retarder* GypsumSuperFOIL SFTV FR Reflective Membrane 1m x 25m - Energy Saving Foil Sheet - Fire-Rated 2-in-1 Sustainable Reflective Radiant Barrier & Waterproof Vapour Barrier VCL for Home & Auto. In fact, it is almost a "perfect" vapor barrier. 4. Our range of Plastering Tapes and Adhesives includes jointing tape, c-studs and cove adhesive. 05 per m. Keep weeds at bay, and make sure your lawn is always lush and fertile with weed membrane and landscape control fabric here. snug friction fit in the wall cavity. 19 per m², £22 per pack | Buy now from Wickes. Vapour Check. £1. At the front edge on the bottom of the countertop overhang I'll run a thin bead of clear silicone on the edge of the metal to seal and adhere the Al to the wood, and to soften the edge of the aluminum. 5mm Knauf Wallboard. Ideal for use as dry lining directly behind the finishing. Better still don’t use either a vapor barrier or a vapor retarder. We decided to attach the wooden battens before the foil wrap was up, so that we wouldn’t have to screw through the foil bubble wrap. StegoCrawl is a complete solution for crawl space encapsulation designed to provide unmatched, permanent performance. The vapour barrier itself is basically a tough foil bubble wrap material. The proper way for homeowners to insulate a crawl space is to insulate the walls and lay a vapor barrier on the ground. British Gypsum Gyproc Thermaline PIR Tapered Edge insulated plasterboard 2400mm x 1200mm x 53mm. 4 Apr 2014. Our range of Plastering Tapes and Adhesives includes jointing tape, c-studs and cove adhesive. It is supplied in 30m length rolls and the following widths: 100mm, 112. 1 in 2015, 2018, and 2021 IRC) Limitations. should be used when handling all Knauf boards. Skip to. 5 x 20m Dryrod DPC Kit Standard Room - 18 Linear Metres Dryzone 310ml DPC Kit Large Room - 24 Linear Metres Dryzone 310ml DPC Kit Standard Wall - 6 Linear Metres Dryzone Damp Proof Course Cream Foil Cartridge - 600ml - Pack of 5 Dryzone Damp Proof Course Cream Foil Cartridge Kit - 600ml - Pack of 10 Choose from many types of vapour barriers for residential and commercial structures. ) With 2" of polyiso on the exterior you have more than adequate dew point control for a. Ideal for when a vapour barrier is needed to prevent moisture ingress; Suitable for external walls and roofs;. Vapour Control Layers (VCL) Vapour control layers (VCL) are sheets of material that prevent water vapour from accumulating in the structure of a building. Seal all wall cracks and holes in the wall being vapor-proofed to block air gaps. Easy to cut and install. First I want to clear up the common confusion between “vapor barriers” and “air barriers. Buy great products from our wet and windy Category online at Wickes. This tape is made of a UV resistant polypropylene film and coated with a specially formulated solvent-based acrylic adhesive. That's the technical stuff, but it is easy to remember that less than 1 Perm is a functioning vapour barrier. The air and vapour barrier must be applied on the warm (top) side of the insulation. 4M X 20M 1000G Clear Heavy Duty Polythene Plastic Building Dust Rubble Sheet DIY. Older stuccos had more lime in the mix and therefore were more vapor permeable. Designed to be lightweight and space-saving while retaining excellent insulating properties. 5mm thick, 1200mm x 900mm size vapour panel cost as of 2022 £9. Product code: 286695. A vapor barrier is a material used for damp proofing. Use special sealing tape to join sheets if polyethylene sheets are being used. Product code: 153230. 00 from WickesStill, the most common thicknesses are 4, 6, and 8 mils. The water-resistant membrane incorporated between the polystyrene and the plasterboard helps to form a vapour barrier and is ideal for when there is a risk of damp. This tape forms a flexible, airtight seal, perfect for a wide range of applications both indoors and out. The foil provides a vapour barrier; if you tape the joins between the boards you don't need an additional barrier. The vapour control layer helps prevent the passage of warm moist air from inside the property from permeating into the wall structure or into the roof space, where it can condense. Real Milk Paint. All dimensions in millimetres. Despite my strong belief that a below-slab vapor barrier should always be located in direct contact with the slab, you should always confer with the designer and engineer of record about how to meet the unique demands of slab design with the overall construction of the building. Stains or Peeling Paint: Water stains on walls or ceilings, as well as peeling or bubbling paint, are signs of moisture issues. 3 Plus Vapour Barrier Air Tight Sealing Membrane - 1. 1-877-464-7834. Please enter a valid postcode. A Vapour Control Layer, or VCL for short, is a plastic layer that restricts the movement of warm, moist air from inside a property into the fabric of the building. 5mm, 150mm, 225mm, 300mm, 337. Put a vapour barrier immediately behind the plasterboard wall (on the warm side) then insulation, (I used wall batts - rockwool) and then something to keep the insulation between the studs. 05 per m. Reviews . Materials and components within the assembly form critical barriers that function to control water, air, heat, water vapour, sound, light and fire loads. £22. 15m length x 1m width. 6. Part of SuperFOIL's next generation of highly specified multi-foils with unrivalled thermal performance, SuperFOIL SF40 is comprised of 37 layers including reinforced heavy duty double-foil outer layers and provides a 3-in-1 insulation solution with radiant barrier, vapour control layer delivering a thermal resistance of up to 3. Other than the vapor barrier being new the only thing different is that I now have a dehumidifier system. This rule requires that at least two thirds of the insulation value of the wall is on the cold side of the vapour barrier (see Figure 2-13). Enhanced sound : performance. 2m (6520P) YBS Airtec Reflective Double Insulation 25m x 1. The code requires all building assemblies to include an air barrier and a vapour barrier. 4 ng, making it about 18 times more vapour resistant than building codes allow. And if a wall system can’t dry out, it becomes vulnerable to moisture damage and mold. Learn more. Stego Wrap 20-Mil is manufactured with only the highest grade of prime, virgin, polyolefin resins which allows this product to greatly resist degradation. uk. A vapor barrier is a material used for damp proofing. A vapor barrier can act as a very effective air barrier, but an air barrier does not (and should not) always stop vapor. Building and renovating homes in cold climates requires vapour barriers in some places. Company Video. These pavers cost approximately $4 to $6 per square-foot, with the price varying according to the availability of materials. When installing on a flat, vented roof. The vapor barrier is the most crucial element in crawl space encapsulation projects because it blocks humidity and moisture from coming into contact with the underside of the home. Kingspan and Celotex offer products specifically designed for this method, with insulation bonded to plasterboard and with a vapour barrier. 5m at Screwfix. If the floor above the crawl space is already covered with an impermeable material (e. High resistance to delamination and damage. 47R in a roof construction. Incised Timber Fence Post 75 x 75mm x 1. Ideal for use as dry lining directly behind the finishing layer (such as plasterboard), SFTV1L minimizes the amount of warm moist air from inside the home entering the insulated wall, roof or floor, reducing condensation and helping to prevent longer term. *Ng stands for Nanograms, or billionths of a gram of water. Product code: 253356. £22. Currently in Stock. Without a major difference to the temperature outside of the building, and nowhere for the moisture to get. Vapor barrier in the basement at this point (after the exposed studs, fiberglass have been placed) is a definite no. xml ¢ ( ´•ËnÂ0 E÷•ú ‘·Ub袪* ‹>–-Ré ˜x Vý’=¼þ¾ QU A…l"93÷Þã±d Fk£“%„¨œÍY?ë± lᤲ³œ}MÞÒG–D V í,äl ‘ †·7ƒÉÆCLHmcÎæˆþ‰óXÌÁˆ˜9 –*¥ F -ÃŒ{Q|‹ ðû^ï Î"XL±ò`ÃÁ ”b¡1y]Óïš$€Ž,y® «¬œ ïµ* R /­ü“’î 2Rn{âùxG Œ L¨*Ç vº MP ’± ø. Download. 0. We supply trade quality DIY and home improvement products at great low prices Description. Delivery Within 3 days from our supplier. 99Inc Vat. The Drybase® Liquid is applied to damp proof membrane as a single pack barrier coating for above ground use. Removing excess spray foam with a kitchen knife. Dodo Barrier PRO. Wickes Slotted Concrete Fence Post 60 x 100mm x 1. Drybase Black Liquid Damp Proof Membrane - 1L. Currently in Stock. Delivery Next day available. Wickes Self Adhesive Foil Tape - 50mm x 45m. Technical Sheet 1 - Wickes Green Polythene Vapour Barrier - 2. 92. Vapor barriers are classified by their vapor permeance, or perm rating, which is a measure of the rate of moisture diffusion through the material. Typical 8-mil polyethylene sheeting costs 5 to 7 cents per square foot. £26. Features & benefits. But why leave a short answer when you can get all wordy about something? Alternatives to drywall like tongue and groove wood or interior plywood walls will not make any difference to the ideal location of. £150. Product Details. A vapour barrier is an important component in building construction. A vapour barrier, on the other hand, is a damp proofing product attached to a wood floor underlay to reduce moisture passage. The function of a vapor barrier is to retard the migration of water vapor. This extra heavy-duty plastic can be used under concrete slabs as a vapor barrier and on top of freshly poured slabs as a curing blanket. wedi Vapor 85 Building Board is the same construction as wedi Tile. 25. 1 and 1. Insulation for a heated slab floor shall meet the requirements of Section 110. High tensile 170gsm polyester base. 2 VAPOUR CONTROL MEMBRANES Where a pliable building membrane is installed as a vapour barrier, Class 1 or Class 2 membranes shall be continuously sealed at all discontinuities, end laps, joints. The vapor barrier systems comprised membranes of virgin PE, 100% new PE, regenerated PE and multilayered virgin and regenerated PE. For roofs, a roof underlay should be used, not a vapour barrier. DON'T MISS THESE. , according to the American Lung Association. Order YBS Airtec Reflective Double Insulation 25m x 1. Quantity: Add for Delivery. All-in-one alternative to buying single pieces of insulation and plasterboard. 4 Vapour barrier materials; 3. 1 perm and less than 1. 99 Sale Dodo Super Liner 6mm. Visqueen Polyethylene Damp Proof Course is a black, flexible 0. com. The intelligent vapor barrier adapts to wick moisture away from the wall, whether the humidity level is higher outside the wall (winter) or inside (summer). Large Blowing Machines. The US Department of Energy recognizes all three, but. Edge beams not connected to the slab, pad footings and strip footings — founded in accordance with. 5mm thick, 1200mm x 900mm size vapour panel cost as of 2022 £9. Vapour barriers can be installed in roofs, walls and floors. 80 mm (4) 0. Condensation is common where cold meets warm in areas like roof spaces and external walls. A vapour barrier needs to be introduced and this can be done by either fixing a polythene sheet to the timber battens before fixing the plasterboard or, more simply, by using vapourcheck plasterboard which has a thin silver foil. £0. pdf. Supporting many of the worlds major Oil and Service Companies in supplying project specific, isolation and welding safety vapour barrier solutions, with turnaround possible in hours. Vapour barriers are waterproof, vapour proof and help to prevent mould and dampness from accumulating in a. 64. Affordable option. Vapor barriers have varying degrees of permeability, expressed in perms. 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. Product code: 255943.