20 mil vapor barrier

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Vapor barrier 20' X 100' 10Mil Clear CF1020C. Clear Sheeting measuring 20' X 100' is made of 10 mil polyethylene plastic. Heavy-duty Sheeting can be used as drop cloth, as a vapor barrier for concrete or between drywall and insulation, also can be used under wood floors or to cover crawl spaces. It covers up to 2000 sq.ft.This 20 mil White film is an aesthetically clean membrane with a diamond reinforced pattern to resist tearing. Excellent for construction sites, tough agriculture jobs, aquaponics and more. This 20 mil string reinforced polyethylene construction film is heavy duty and versatile for many uses, including crawlspaces as a vapor barrier or a vapor ...12 Mil Vapor Barriers. 12 Mil Vapor Barrier for Crawl Spaces, GuardianLiner™ 13' 4" x 75'. Shipping Included Details. DIY orders over $200 will included shipping. There will be a $9.28 handling charge for each roll of vapor barrier. For Alaska, Hawaii and Canada-. DIY orders over $200 will receive a 10% discount to help pay for the cost of ...20 ft. x 100 ft. Woven Reinforced String Plastic Sheeting Great for Vapor Barrier, Crawl Space Under Floor. 68. (8) Questions & Answers (15) …Progress has been made in military mental health care, but there’s still work to be done to help reduce the number of veterans who die by suicide. Retired and active duty service m...20 mil Yellow Guard Husky Vapor Barrier ( Click here for FULL SPECIFICATIONS ) Husky® Yellow Guard® Properties Test Method ASTM E 1745 Class A Requirements Yellow Guard® Vapor Barrier Test Result* Measures; Permeance: ASTM F 1249: 0.1 perms: 0.0073 perms/**0.0033 WVTR: Resistance to water vapor: Puncture Resistance:The most common vapor barrier material is polyethylene (poly). It is measured by mils, which are the thickness of the poly. Each mil is 0.001 inch and most codes call for 6 mil, which is 0.006 inches thick. However, you should not use a poly vapor barrier in your basement. Depending on what the home is made of, and where you are …20 Mil 14 ft. x 105 ft. Yellow Guard Vapor Barrier. SKU#: 4322014105Y. MFG#: CFYG2014105Y. $585.69 / EACH. Add to List. Share. Select your local branch for best pricing and delivery options. Orders ship in 1-3 business days.

Crawlspace 2000 offers: A multi-ply laminate containing a high strength cord grid for stability- In other words, it's reinforced and 20 mils thick. Made from 100% Virgin Polyethylene resins (a very high quality polyethylene) Weight: 93 LB/1000 SQ FT. Temperature range: Minimum: -40° F, Maximum: 170° F. Click for.Rome's city officials vote to install a barrier around the famed Trevi Fountain. Here's what you need to know. Mamma mia. Rome's city council just approved a resolution to set up b...Unlock the secrets of vapor barriers under concrete slabs. Explore material choices, industry classifications, and the essential advantages for builders. ... 20 mil string reinforced (1) 30 mil (1) 6 mil is it strong? (1) A-20 Armorlon Containment Tarps (1) ASFR did you know (1) ASTM E 1745 Compliance (1) ASTM E-1745-11 (1) Designed to provide superior resistance to gas and moisture transmission, PERMINATOR EVOH is a highly resilient underslab gas/vapor barrier (20 Mil) designed to restrict naturally occurring gases, such as radon, methane, gasoline, solvents, oils, and hydrocarbons, from migrating through the ground and into the concrete slab. USES. Bulk-12: Required 24 ROLLS ( 2 PALLETS ) 12 ROLLS ( 1 PALLET ) 8-11 ROLLS 6-7 ROLLS 4-6 ROLLS 1-3 ROLLS. Quantity: Add to Wish List. Select all. Add selected to cart. Description. 20' X 100' 15 mil Clear 143.8 WEIGHT 9 ROLLS/PALLET. BUY AND BULK SAVE. ****THIS ROLL MUST BE SHIPPED BY TRUCK FREIGHT CARRIER***.The Issues in a Dirt Floor Crawl Space. The best bet is to do your homework so you can decide if a lighter 10 mil crawl space liner will do the job, or something heavier such as a 20 mil liner. Knowing that there are certificates/ spec sheets that spell out how the liner is rated will insure you are getting what you are looking for.Oct 9, 2022 · This 20 mil vapor barrier will help insulate due to the thickness. The dimensions of this product are 12' x 100'. Multi-Purpose - Our white plastic sheeting can be used as a moisture barrier, 10 mil vapor barrier, protection barrier for painting, dust containment, spray barrier and more! Tex-Trude Xtreme 20 Mil Vapor Barrier / Retarder is a high performance heavy duty material designed for use under concrete slabs to stop moisture migration and to control radon gas, methane, and other soil gases or contaminants. The Xtreme 20 mil thick high puncture resistant Vapor Barrier / Retarder has superior performance to other materials ...

We're here to help. 1-949-257-4100. Drago Wrap is specifically engineered to serve as a barrier to volatile organic compounds (VOCs). This 3-in-1 high performing solution helps transform brownfield sites into healthy built environments.The 16 ft. x 100 ft. Clear Plastic Sheeting is a 6 mil thick polyethylene film that is used in a variety of do-it-yourself projects. This sheeting can cover up to 1,600 square feet. This extra heavy-duty coverall can be used as a vapor barrier for concrete, between drywall and insulation and under wood floors.The SilverBack® brand vapor barrier was made for one purpose, to offer the most durable choice in a crawl space vapor barrier. While others claim to measure 20 Mil, the SilverBack® actually does. Offered in both Cord Reinforced (SR) and High Strength (HS) you will find our 20 Mil really is 20 Mil.Eczema and your skin barrier basics: the science behind your body's best shield By Angela Ballard, RN Published On: Sep 24, 2022 Last Updated On: Feb 28, 2023 Your skin is your fir...The 20 Mil Vapor Barrier is the perfect product for small and temporary projects. Our barriers will protect your home through effective waterproofing. Size. 20 mil standard …For the first time in history, all four Walt Disney World parks have female vice presidents. Learn how they got here and their hopes for the future. Disney has a lot to celebrate r...

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PERMINATOR EVOH is available in 20 mil thickness and furnished in 150′ (45.7 m) long rolls. PERMINATOR HP 15 Mil Underslab Vapor Barrier (High Puncture Resistance): PERMINATOR HP underslab vapor barrier is a new generation of polyolefin-based resin/chemical technology. PERMINATOR HP provides the vapor barrier industry with a highly effective ... The puncture and tear strength greatly outmatches even our current 12 Mil SilverBack® SR (String Reinforced) vapor barrier product line. ... 20 Mil SilverBack® HS (High Strength) Vapor Barrier. Price: $148.28 View. Quick View. Featured! Spotlight! Moisture Medic® Dehumidifier- 70, 90 & 130 Pint.Concrete Vapor Barrier - 20 Mil - 12' x 35' Product Code: cvb-20-12x35; Availability: In Stock; FREE SHIPPING! $164.99 ; Available Options . Size: Qty Add to Cart. 0 reviews / Write a review. Related Products. Vapor Bond Tape - White - 4" x 180' White Single sided tape is great use with Vapor Barriers, Greenhouse Plastic, Covers and Liners.&nbsHUSKY ® YELLOW GUARD ® VAPOR BARRIER/RETARDER HIGHLIGHTS. 100% virgin polyolefin resins. Exceeds industry-standard ASTM E 1745 Class A, Class B, and Class C specifications. Husky® Yellow Guard® Vapor Barriers were developed for use as a durable vapor barrier & have exceptionally low water vapor permeance. 10, 15 & 20 mil.

Professional (6+ Mil) Heavy-duty (4-5 Mil) Medium-duty (2-3 Mil) Clear Black White 25 100 300 1 10 20 Construction Insulation Landscaping Painting Roofing Vapor Barrier Plastic Polyethylene Plastic sheeting Construction film 5 4 Project Source BARRICADE 100 …10 ft. X 100 ft. Woven Reinforced String Plastic Sheeting Great for Vapor barrier, crawl space under Floor This Plastic Poly Sheeting from Boen is made from a durable water-resistant material and efficiently acts as a protective barrier for a multitude of construction, agriculture and demolition projects.Stego Wrap Vapor Barrier – it comes in various thicknesses: 10 mils (0.25 mm), 15 mils (0.38 mm), and 20 mils (0.5 mm). The barrier has Class I and II (A and C) variants. The permeance is as low as 0.0086 perms for a Stego wrap. Stego has several barriers made specifically for crawl space encapsulation.White Premium Reinforced Plastic Sheeting - 20 Mil - (12' x 100') - Thick, Heavy Duty Polyethylene Film, Drop Cloth Vapor Barrier Plastic Sheeting for Crawlspace, Garden, Greenhouses. $64999 ($0.54/Sq Ft) FREE delivery May 20 - …Apr 3, 2016 ... How did this project turn out? WATCH HERE: https://www.youtube.com/watch?v=3TRLd2HYhbU&list=PLO47JMsdYGrkxM_ZkOc3lMnsVhTqj80bB Learn the ... VaporBlock® Plus™ 20 Mil Vapor Retarder/Gas Barrier is a seven-layer, co-extruded vapor barrier made from state-of-the-art polyethylene and EVOH resins to provide unmatched impact strength and superior resistance to gas and moisture transmission. StegoCrawl® Wrap 15-Mil Crawl Space Vapor Barrier 14' X 100'. $476.95. Unrivaled Moisture Vapor Protection and Durability. Most popular roll size. StegoCrawl Wrap 15-mil Vapor Barrier is an innovative, multi-layer liner designed to provide unmatched performance even in relatively... Full Description.Under-Slab Vapor / Gas Barrier Quick Overview. Raven VBP20 VaporBlock Plus 20. Interested in this item or want more information? Hours: 8:00 & 5:00 CST. Phone: ... Class A, B and C requirements. Available in a 20 (Class A) mil thicknesses designed to meet the most stringent requirements. VaporBlock® Plus™ 20 is produced within the strict ...

Heavy Duty Vapor Barrier 20 mil - Heavy duty durable plastic sheeting engineered from low-density polyolefin. Ships blue or green depending on supply. Our rolls of plastic sheeting are strong and durable - they will not tear or rip easily. Primary application is as a vapor barrier underneath concrete. The dimensions of this product are 12' x 105'.

Dura Skrim White 20 mil String-Reinforced Barrier. Concrete Vapor Barriers. 10 Mil Concrete Barrier. 15 Mil Concrete Barrier. 20 Mil Concrete Barrier. Flame Retardant Vapor Barriers. 6 Mil Dura Skrim Flame Retardant String Reinforced Barrier . 10 Mil Flame Retardant String Reinforced Vapor Barrier. Invest in a Quality Barrier With …This tri-layer film has a thick white film on one side and a black film on the opposite side. Great for heavy duty applications. Water and Vapor Barrier. Thickest Polyethylene Film on the market. 1 Piece Construction with Zero Seams. Bright White Skins on one side provide high reflectivity Black Skin on the other side.Our Concrete Vapor Barrier is a 20 mil heavy duty durable plastic sheeting engineered from low-density polyolefin. Strong and durable, they will not rip or tear easily. Primarily applications include being used as a vapor barrier beneath concrete in commercial construction applications. Tested by independent test laboratories and far exceeds ...20 Mil Reinforced Crawl Space Liner | Vapor Barrier. Home. Shop All. 20 Mil Reinforced Crawl Space Liner - 12' x 100' Roll. Viaflex (previously Raven Industries) $559.99. (4 …RedGard uncoupling mat membrane is ideal for installing ceramic or stone tile over challenging substrates. It provides a waterproof and vapor-proof barrier and helps prevent cracks...Vapor barrier prices can vary, but it generally costs 75 cents to $1.25 per square foot to install a 6-mil or 10-mil vapor barrier. Dry Pro uses a thicker, more reliable material, and from experience, we know that a vapor barrier is part of a comprehensive crawl space encapsulation system. We're here to help. 1-949-257-4100. Drago Wrap is specifically engineered to serve as a barrier to volatile organic compounds (VOCs). This 3-in-1 high performing solution helps transform brownfield sites into healthy built environments. White Premium Reinforced Plastic Sheeting - 20 Mil - (12' x 100') - Thick, Heavy Duty Polyethylene Film, Drop Cloth Vapor Barrier Plastic Sheeting for Crawlspace, Garden, Greenhouses. $64999 ($0.54/Sq Ft) FREE delivery May 20 - …We're here to help. 1-949-257-4100. Drago Wrap is specifically engineered to serve as a barrier to volatile organic compounds (VOCs). This 3-in-1 high performing solution helps transform brownfield sites into healthy built environments.

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The SilverBack® 20 Mil vapor barrier weighs 109 pounds per 1000 square feet or 109 MSF. Compare that to the competitors 20 Mil @ 74 pounds per 1000 square feet. That's 35 pounds less plastic for the same money as the SilverBack®. Use the 20 Mil SilverBack® on the floor and the 12 Mil GuardianLiner™ on the walls to keep the costs inside the ... Stego StegoWrap 14 ft. x 105 ft. 20 Mil Class A Vapor Barrier. SKU#: 278SW1000A. MFG#: SW1000A. $855.69 / ROLL. Add to List. Share. Select your local branch for best pricing and delivery options. Orders ship in 1-3 business days.Concrete Vapor Barrier 20 Mil Thickness for Concrete Installations, Crawl Spaces, & MoreOur Conc.. $104.99 . Add to Cart . White Construction Plastic 6 Mil. White Construction Plastic 6 MilEngineered from low-density polyethylene, our …The primary purpose of a vapor barrier is to prevent water vapor or moisture from reaching a building's ceilings, walls, or crawlspaces where it can condense, potentially causing mold growth or rot. Particularly in regions with specific climate characteristics, the installation of a vapor barrier becomes crucial to maintaining the …Oct 9, 2022 · This 20 mil vapor barrier will help insulate due to the thickness. The dimensions of this product are 12' x 100'. Multi-Purpose - Our white plastic sheeting can be used as a moisture barrier, 10 mil vapor barrier, protection barrier for painting, dust containment, spray barrier and more! 398. • Basic foam underlayment. • Simple to install and lightweight. • 2mm polyethylene foam laminated with a vapor barrier. FloorComfort. 4-ft W x 25-ft L x 2-mm T Premium Foam Moisture Resistant Flooring Underlayment (100-sq ft / Panel) 525. • Fanfold technology makes it easy to lay, cut and install.The puncture and tear strength greatly outmatches even our current 12 Mil SilverBack® SR (String Reinforced) vapor barrier product line. ... 20 Mil SilverBack® HS (High Strength) Vapor Barrier. Price: $148.28 View. Quick View. Featured! Spotlight! Moisture Medic® Dehumidifier- 70, 90 & 130 Pint.The Importance of Crawl Space Vapor Barriers; Seeking Professional Guidance; Selecting the Right Thickness: Comparing 6 Mil, 12 Mil, and 20 Mil Liners. Understanding Mil Thickness in Vapor Barriers; Deciding Factors: Conditions and Usage; Comparing Thickness to Different Sweater Types; Thicker is Smarter: Why Invest in a … ….

This 20 mil White film is an aesthetically clean membrane with a diamond reinforced pattern to resist tearing. Excellent for construction sites, tough agriculture jobs, aquaponics and more. This 20 mil string reinforced polyethylene construction film is heavy duty and versatile for many uses, including crawlspaces as a vapor barrier or a vapor ...Feb 2, 2016 ... ... mil plastic moisture barrier, encapsulation ... Barrier, crawl space, waterproofing, tips, How to install moisture barrier ... Vapor Barrier DIY # ...Designed to provide superior resistance to gas and moisture transmission, PERMINATOR EVOH is a highly resilient underslab gas/vapor barrier (20 Mil) designed to restrict …StegoHome 15-Mil Vapor Barrier is a high-performance plastic sheet membrane designed for below-slab applications to prevent the natural transmission of moisture vapor and soil-gas into a home’s foundation. It is a multi-layered, engineered polyolefin film that uses only high-grade raw materials to provide unmatched vapor protection ...StegoHome 15-Mil Vapor Barrier is a high-performance plastic sheet membrane designed for below-slab applications to prevent the natural transmission of moisture vapor and soil-gas into a home’s foundation. It is a multi-layered, engineered polyolefin film that uses only high-grade raw materials to provide unmatched vapor protection ...Product Description. This Reinforced Polyethylene liner is generally used as a vapor barrier to cover all of the ground in the crawl space. All edges are sealed to the wall liner with tape, and also sealed to the wall liner at all piers. We now have five different liner thicknesses available in various colors and configurations: 6, 8, 10, 12 ...Fluorescent starters are used in several types of fluorescent lights. The starter is there to help the lamp light. Learn about fluorescent starters. Advertisement A fluorescent lig...Catherine asks, “Every time we have damp weather our concrete floor in the garage gets so much moisture on it that it's dangerous to walk on. What causes this, and what can we do a... 20 mil vapor barrier, Vapor barriers can help control moisture in everything from basements and crawl spaces to ceilings and walls. The best moisture control must also have air-sealing gaps. ... High-performance vapor retarders and barriers are commonly available in 8-mil, 10-mil, 15-mil, and 20-mil thicknesses, but increased thickness does not always …, 20 Mil SilverBack® HS (High Strength) Vapor Barrier. 4.96 stars, based on 23 reviews 23 review (s) . | Write a review. Crawl Space Repair. The 20 Mil SilverBack® HS has 100% …, The YCS 20 mil is a pre-rolled, 100% reinforced ground vapor barrier, not 10% reinforced like most liners. This product will not grow mold, and designed for the toughest of …, This 20 mil White film is an aesthetically clean membrane with a diamond reinforced pattern to resist tearing. Excellent for construction sites, tough agriculture jobs, aquaponics and more. This 20 mil string reinforced polyethylene construction film is heavy duty and versatile for many uses, including crawlspaces as a vapor barrier or a vapor ..., Premium vapor barrier. Thickness: 10 mil. Color: yellow. Dimensions: 14 ft. x 210 ft. 2,940 sq. ft. of coverage. Exceeds industry-standard ASTM E 1745 Class A, Class B and Class C specifications. Developed for use as a durable vapor retarder. Commercial or residential use. Return Policy., Professional (6+ Mil) Heavy-duty (4-5 Mil) Medium-duty (2-3 Mil) Clear Black White 25 100 300 1 10 20 Construction Insulation Landscaping Painting Roofing Vapor Barrier Plastic Polyethylene Plastic sheeting Construction film 5 4 Project Source BARRICADE 100 …, 20 Mil 14 ft. x 105 ft. Yellow Guard Vapor Barrier. SKU#: 4322014105Y. MFG#: CFYG2014105Y. $585.69 / EACH. Add to List. Share. Select your local branch for best pricing and delivery options. Orders ship in 1-3 business days., USES: Stego Wrap 20-Mil Vapor Barrier is used as a below-slab vapor barrier. COMPOSITION: Stego Wrap 20-Mil Vapor Barrier is a multi-layer plastic extrusion manufactured with only the highest grade of prime, virgin, polyolefin resins. ENVIRONMENTAL FACTORS: Stego Wrap 20-Mil Vapor Barrier can be used in …, 20 mil vapor barriers are used under concrete slabs or in buildings to stop moisture migration and reduce mold, mildew, and fungus. Vapor barriers should exceed ASTM 1745, Class A, B, and C standards. The American …, The YCS 20 mil is a pre-rolled, 100% reinforced ground vapor barrier, not 10% reinforced like most liners. This product will not grow mold, and designed for the toughest of …, First, we need to work out how humans work—second comes training the machines. What do you need to build a self-driving car? Roboticists and computer scientists have generally sett..., The puncture and tear strength greatly outmatch even our current 20 Mil SilverBack® SR (Cord Reinforced) vapor barrier product line. This vapor barrier is completely SEAMLESS. There are no welds or panels. The SilverBack® HS is a smooth one piece product. This product is subject to a UPS large package handling fee of $9.28 for the first roll ... , Yellow Guard Vapor Barrier 20 mil Vapor barrier. Toggle menu. Welcome to Vapor-Barrier.com ( WHITTCO LLC )! 5100 Eldorado Pkwy. 102-383 McKinney Texas 75070; 972-853 ... , 20 Mil Vapor Barrier, GuardianLiner™. 4 Review (s) Write a Review. Price: $495.00. 20 Mil Vapor Barrier for Crawl Space Encapsulation, GuardianLiner™. Part Number: …, A series of 78 new flood barriers have successfully protected Venice from the 53-inch flood expected on Saturday for the first time in around 1,200 years. The highly anticipated fl..., For the first time in history, all four Walt Disney World parks have female vice presidents. Learn how they got here and their hopes for the future. Disney has a lot to celebrate r..., Under-Slab Vapor / Gas Barrier Quick Overview. Raven VBP20 VaporBlock Plus 20. Interested in this item or want more information? Hours: 8:00 & 5:00 CST. Phone: ... Class A, B and C requirements. Available in a 20 (Class A) mil thicknesses designed to meet the most stringent requirements. VaporBlock® Plus™ 20 is produced within the strict ..., Groundworks uses CrawlSeal ™, a 20-mil thick vapor barrier that prevents water from the surrounding earth from getting into your crawl space. Equipping your crawl space with a vapor barrier is vital to keeping your home healthy. Frequent rainfall keeps the earth rich in water, and eventually, this water rises to the surface and evaporates. , Thickness: 10-Mils. Roll Size: 6' x 150' = 900 sq ft. Weight: Approx. 47 lbs. Roll Core: 36’’ (one fold) Color: Green. Exceeds ASTM E1745 Class A, B, and C. Life of the Building™ Warranty. Low Water Vapor Permeance. Excellent Puncture Resistance., The puncture and tear strength greatly outmatch even our current 20 Mil SilverBack® SR (Cord Reinforced) vapor barrier product line. This vapor barrier is completely SEAMLESS. There are no welds or panels. The SilverBack® HS is a smooth one piece product. This product is subject to a UPS large package handling fee of $9.28 for the first roll ..., The SilverBack® brand vapor barrier was made for one purpose, to offer the most durable choice in a crawl space vapor barrier. While others claim to measure 20 Mil, the SilverBack® actually does. Offered in both Cord …, The 16 ft. x 100 ft. Clear Plastic Sheeting is a 6 mil thick polyethylene film that is used in a variety of do-it-yourself projects. This sheeting can cover up to 1,600 square feet. This extra heavy-duty coverall can be used as a vapor barrier for concrete, between drywall and insulation and under wood floors., Yellow Guard Vapor Barrier 20 mil Vapor barrier. Toggle menu. Welcome to Vapor-Barrier.com ( WHITTCO LLC )! 5100 Eldorado Pkwy. 102-383 McKinney Texas 75070; 972-853 ..., Designed to provide superior resistance to gas and moisture transmission, PERMINATOR EVOH is a highly resilient underslab gas/vapor barrier (20 Mil) designed to restrict naturally occurring gases, such as radon, methane, gasoline, solvents, oils, and hydrocarbons, from migrating through the ground and into the concrete slab. USES. , Our Concrete Vapor Barrier is a 20 mil heavy duty durable plastic sheeting engineered from low-density polyolefin. Strong and durable, they will not rip or tear easily. Primarily applications include being used as a vapor barrier beneath concrete in commercial construction applications. Tested by independent test laboratories and far exceeds ..., Stego Wrap Vapor Barrier – it comes in various thicknesses: 10 mils (0.25 mm), 15 mils (0.38 mm), and 20 mils (0.5 mm). The barrier has Class I and II (A and C) variants. The permeance is as low as 0.0086 perms for a Stego wrap. Stego has several barriers made specifically for crawl space encapsulation., Although there are no guarantees of safety during a tornado, you can take actions to protect yourself. Read about what you can do. Tornadoes are nature's most violent storms. They ..., Stego Wrap 20-Mil Vapor Barrier is a multi-layer plastic extrusion blown film vapor barrier that provides unrivaled moisture protection for under-slab applications. It is made from prime, virgin resins and additives, and meets ASTM E1745 Class A, B & C standards for water vapor diffusion and puncture resistance., Black History Month celebrations often focus on African American achievements in politics, culture and sports – business achievements, in ge... Black History Month celebratio..., Geo-Seal® EV40s is a significant improvement over existing single sheet membranes. Geo-Seal® EV40s consists of an EVOH membrane combined with a robust geotextile layer to provide a single sheet vapor intrusion barrier that is chemically resistant and easy to install while also providing improved protection during the installation process., VBP20 is one of the most effective underslab gas barriers in the building industry today far exceeding ASTM E-1745 (Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill Under Concrete Slabs) Class A, B and C requirements. Available in a 20 (Class A) mil thicknesses designed to meet the most stringent requirements., Vapor barriers are classified by their vapor permeance, or perm rating, which is a measure of the rate of moisture diffusion through the material. Class I vapor barriers have a vapor permeance of 0.1 perm or less. Class II vapor barriers have a vapor permeance of between 0.1 and 1.0 perm. Class III vapor retarders have a vapor permeance of 1.0 ..., Under-Slab Vapor / Gas Barrier Quick Overview. Raven VBP20 VaporBlock Plus 20. Interested in this item or want more information? Hours: 8:00 & 5:00 CST. Phone: ... Class A, B and C requirements. Available in a 20 (Class A) mil thicknesses designed to meet the most stringent requirements. VaporBlock® Plus™ 20 is produced within the strict ...