Vapor Barriers provide additional protection between the subflooring and flooring by. Rigid: supported in both directions from wind pressure. Water Barrier vs. We used Farm Supply brand 6 mil reinforced string solid white vapor barrier, Blue Summit vapor barrier seam tape, and Zip System flashing tape for this insta. Vapor barrier material costs: The cost of 6 mil plastic sheeting ideal for use as a vapor barrier costs just $0. Use 6mil basic water barrier only. B) Once barrier is in place, remove soil or other particles with a dry cloth or a fine broom to allow for improved adhesion to the POUR-N-SEAL™ liquid. BEST BANG FOR THE BUCK: BestLaminate Blue Vapor 3-In-1 Flooring Underlayment. Polyethylene Film. 99 $189. In the hallway I only used the underlayment and it's much quieter. Seal all seams, gaps, and holes in the air barrier with caulk or foam before tub/shower installation. 10 Mil DiamondBack™ Seamless. Consult local building codes prior to installation and to determine the length to cut barrier. Concrete walls should have any void areas filled and any fins, mortar joints or screws should be flush with the wall. 0 perms). 1 +1 for the reference, even though most well logiced advice seems to point to the contrary. In homes with dirt basements, they poured a concrete floor or installed a vapor barrier. Average Price Per Square Foot: $2. A) Install the vapor barrier as closely as possible to pipe penetrations to minimize the amount of POUR-N-SEAL™ necessary to seal around all penetrations. Abstract. Vapor Barriers. Water stains on your walls and ceiling. Before installing a vapor barrier, it is crucial to ensure that the concrete floor is clean, dry, and free of any debris. vapor intrusion is most likely to be a problem. I understand that tyvek is not a. A vapour barrier can easily be realised with a plastic foil like Polythene (at least 0. Vapor Barrier Vapor Barriers provide additional protection between the subflooring and flooring by preventing the emission of vapors and moisture to the inside of the home. Make sure this fits by entering your model number. Winston-salem / High Point Location. Efficient Installation ; Proprietary Patented Technology ; Learn More. 49. Insulation. Economical mitigation strategy. See other videos on how. Source. SENTINEL P150 HFB is reinforced with a tenacious, anti-wicking, weft-inserted polyester fabric that is encapsulated on both sides with a proprietary thermoplastic PVC formulation. The cost of installing a vapor barrier depends on the type of vapor barrier, measurements of your crawl space, and other materials or tools. INSTALLATION SUB-SLAB: Vapor Sentinel TM 10-Mil Vapor Barrier is unrolled over an aggregate, sand, or tamped base. Project Source. The barrier comes in rolls about twenty-four inches wide. See installation instructions and warranty information for more guidance. Simple system activation. Vapor barriers come in a variety of materials, with two of the most common options being. Crawlspace Challenges for the Southeast. Unroll the vapor barrier and lay it over the concrete surface you wish to protect. All vapor retarders block air, but not all air barriers block vapor diffusion. Do not fasten the subfloor through the floor assembly. We can start with a basic building science refresher. ft roll): This 3-in-1 underlayment can be used under any laminate flooring to allow your floor to float and create a moisture barrier. 0031 inches thick, and unfaced expanded or extruded polystyrene. Developed for use as a durable vapor retarder. This is a definite 2 person job. ASTM E283. ', Royal Blue (Pack of 3). When rolling out the moisture barrier you want to go from wall to wall and cover the entire floor. Step 4: Install Underlayment. ExoAir 130 can be used with ExoAir 110, ExoAir 110AT or Dymonic® 100 liquid flashing to. Vapor Sentinel New. ft. Barritech VP can be applied over concrete block, concrete, exterior gypsum sheathing, plywood, OSB and many other common building materials. Learn how to properly install StegoHome Below-Slab Protection to protect against water vapor and soil gases like radon in your next home building project. Step 1. Exceeds industry-standard ASTM E 1745 class A, class B and class C specifications. You’ll always know your mitigation systems are performing correctly and building occupants aren’t being exposed to harmful VOCs. First I want to clear up the common confusion between “vapor barriers” and “air barriers. Vapor Sentinel Vapor Barrier SAFETY SHEET MANUFACTURER Vapor Products Group W51N535 Struck Lane Cedarburg, WI 53012 USA. Screw one elbow onto one end of the black threaded plumbing pipe. The yellow plastic film should face the subfloor and the overlap should be on the opposite. Shop Products We Install. As such, it’s important to inspect your vapor barrier at least once a year and conduct basic, at-home maintenance. 2. The difference between air barriers and vapour barriers: The job of a vapour barrier is to prevent vapour diffusion and the job of an air barrier is to stop air leakage through differences in air pressure between inside and out. The added benefit to this underlayment is sound cushioning. How did this project turn out? WATCH HERE:. Flooring Inc. Check out Figure 1. The HPU shall be remotely located at a standard maximum distance of 100 feet (30. The barrier serves to keep moisture out of the room and helps to control humidity levels. When it comes to vapor barriers, a true one has an impermeability value of 0. Tailor a versatile blowing machine to your needs, and let it work for you for years and decades to come. Restricts migration of soil gases such as radon and methane. 5-mm Premium Cushion Flooring Underlayment (100-sq ft /Fan fold) Model # 1102002500. MOISTURE PROTECTION: Helps prevent mold, mildew, and other issues related to vapor. Step 3: Measure and cut the vapor barrier. 15 to $0. Color: Gray. , wet lumber, cast-in-place concrete, etc. So the boards are resistant against water, moisture and humidity, SENTINEL CEMENT FOAM BOARD is an excellent alternative to traditional wall at shower, sauna, and any wet area where waterproofing and vapor barrier is absolute necessary to protect your home from mold and mildew. It’s not a sealed system which means moisture can go under or around the vapor barrier and still get into your crawl space. If the roof is insulated with foil-faced insulation blankets, the. SENTINEL VCM can be used to fabricate metal flashings, pitch-pans and edge details. Cover the leak with plastic sheeting or a tarp to redirect water away from the interior. Contact your local dealer or call 1-800-638-7048. 00 Perms IMP. Vapor barrier installation techniques vary depending on the type of insulation and the climate you live in. Tiling a shower isn't a quick, easy fix. Stego Wrap Vapor Barrier will help remove the risk of water vapor accumulation and the transmission of various soil gases. Crawl under your mobile home by entering through the skirting. 5-mm Premium Cushion Flooring Underlayment (100-sq ft /Fan fold) Model # 1102002500. Continuous: no gaps, cracks or openings. Obtain air barrier and auxiliary materials as a single-source from the Air Barrier Manufacturer to ensure compatibility and compliance with the following requirements: Minimum Application Temperature: 41°F (5 °C) Service Temperature: -40 °F to 158 °F (-40 °C to 70 °C) Water Vapor Permeance (ASTM E96 Method B): 0. BEST. The difference between air barriers and vapour barriers: The job of a vapour barrier is to prevent vapour diffusion and the job of an air barrier is to stop air leakage through differences in air pressure between inside and out. The insulation (fiberglass or cellulose) is then placed on top of the drywall with no vapor barrier above or below. But mfr. installation process, the New Construction System saves installation time and costs. 1. Most condo and apartment associations will specify certain Sound Transmission Class (STC) and Impact Isolation Class (IIC) ratings when it comes to installing underlayment and flooring. Your. Remove Debris. In very warm, humid climates such as the Southeastern United States, crawlspace encapsulation is often the most effective way to solve and prevent moisture damage. The Vapor Sentinel New Construction System is a solution for soil gas control to. See On Amazon. Atticare is a top-rated and fully licensed insulation contractor. In addition, you’ll need to buy tape to secure the vapor barrier, which usually costs around $50 for a 4-inch-by-180-foot. The correct installation of an effective vapor retarder beneath the concrete has proven to reduce or even eliminate issues that arise when moisture moves into interior spaces, including the unfavorable effects moisture has on. We use high performance plastic sheeting products used in everyday construction, industrial, and agricultural applications. e. The cost of a vapor barrier installation ranges from $2 to $4 per square foot or $1,200 to $4,000 in supplies and labor. Find My Store. This is an internet-only auction. Most of the barrier materials used in the construction industry are vapor or moisture diffusers or retarders. ADVANTAGES INSTALLATION INSTRUcTIONS • Always read the flooring manufacturers recommendations and instructions before installing the. Nucore is Floor and Decor’s exclusive in-house vinyl plank flooring brand. Building code requirements for interior vapor barriers (or vapor retarders) have a sad and shameful history. Install a continuous vapor barrier (if required in your climate) with a perm rating of less than one. Proven durability. 50. 70 per square foot. Formulated from top-quality polyethylene (polyolefin) resins. This American made crawl space liner is the basic string reinforced vapor barrier that can be compared to most other brands on the open market for the same stated thickness, 10 Mil. Design, Installation, and Inspection of Water Vapor Retarders Used in Contact with Earth or Granular Fill Under Concrete Slabs. If required, the system can easily be. I just installed it in my living room / hallway. You will want to overlap the vapor barrier equal to 2 inches or more on the wall. This underlayment acts as a slipsheet to minimize dust and reduce noise. By using a vapor barrier, builders can help to prevent these problems. It also protects flooring from increased moisture levels and is used as a component of radon mitigation systems to protect indoor air. Use foam around ducting and other small & difficult cavities. Vapor 3-in-1 Underlayment Silver (100 sq. Do not use the more expensive sentinel protect plus. Use seam tape to cover every seal of the vapor barrier, applying tape from top to bottom. x 140 ft. An average vapor barrier installation costs $2 to $4 per square foot or between $1,200 and $4,000 for materials and labor. The Institute for Research in Construction (IRC) at the National Research Council (NRC) lists the five basic requirements for an effective air barrier as being: 1. * Common home footprints have 6 - 12 corners; complex home footprints have 12+ corners. Vapor Barrier Installation Basics. First introduced in the U. The higher the rating, the more effective at limiting sound. For optimal moisture control you will want to overlap the poly barrier by at least six inches. x 140 ft. Review product technical data and expiration dates and proceed accordingly. Plastic on the outer surface of a wall in cold weather could cause problems. To this point, it’s clear that a vapor barrier is crucial for a home’s safety because it controls the movement of moisture in and out of a building’s walls. We used Farm Supply brand 6 mil reinforced string solid white vapor. Use special sealing tape to join sheets if polyethylene sheets are being used. Limited Time Only! 18-Month Special Financing Available 11/9/23 – 1/2/24. There are two basic types of vapor barriers used with exterior wall insulation. Vapor Barriers We use high performance plastic sheeting products used in everyday. Insulate, foil vapor barrier and tape the seams well. When it comes to metal buildings, insulation addresses two important goals— stabilizing the structure’s interior temperature and preventing moisture from entering or collecting via condensation. ). No other materials are needed for install due to the Lip & Tape Design ensuring quick. Its proponents believed in sealing the joints of PE sheets to create a dual-purpose material ascribing the additional properties of air infiltration control to the already popular ‘6-mil poly. Because the idea is to keep water vapor out of the building’s main structural elements, you need to install the vapor barrier closer to where the humidity and moisture are going to come in. B. Methods Used to Determine Vapor Retarder Effectiveness 8. Premium vapor barrier. Vapor Sentinel New Construction Systems eliminate the need for costly trenching and aggregate backfill with its stronger-than-concreate gas-permeable layer. The result is a system that effectively stops, collects, and exhausts radon. Weekly Household Auction Terms & Conditions. Today’s vapor barriers are ensuring buildings’ airtightness. Beginning at one side of the crawl space, lay down 6-mil or thicker polyethylene plastic over the entire crawl space. RUNNER-UP: QuietWalk Plus QW100PLUS Underlayment. CertainTeed Volu-Matic 200 insulation blowing machine - side view. 00 per sq/ft and rise to $4. Any distance greater than 100 feet (30. A vapor barrier is a sheet that covers your insulation to stop water from causing moisture damage to your insulation. Example #2- Install the dehumidifier in your crawl space with the remote mounted in your garage. If required, the system can easily be. up the wall and fasten it there. A secondary water control layer is often found against the structure, behind or below the exterior insulation. What is a Vapor Barrier? A vapor barrier is an impermeable membrane primarily used to resist water vapor transmissionMoisture related problems in building enclosures have three root causes: 1) external sources of moisture; 2) internal sources of moisture; and 3) construction moisture that is present in materials (e. USES: Vapor Sentinel 10-Mil Vapor Barrier is used for sub-slab installations, to protect indoor structures from soil gas transmissions, as well as moisture vapor. Vapor barriers aren’t really what they seem to be. This heavy duty 60 yard roll of moisture resistant crawl space vapor barrier seam and seal tape is highly durable, waterproof and weatherproof. As a second line of defense, the system allows for simple and easy mitigation system installation if the need arises. 400SQFT AMERIQUE Premium 3 mm Thick Flooring Underlayment Padding with Tape & Vapor Barrier 3 in 1 Heavy Duty Foam (400SF Total, 200SF/Roll), 400 sq. SKU. Size: 120sqft. If you are a DIYer, the cost could be extremely minimal. Attached Vapor Barrier. ft. NEW 3M™ Air and Vapor Barrier 3015NP provides building protection that installs quickly and easily even under extreme conditions without sacrificing performance. Follow adhesive label application instructions. See On. 99 / piece Size: 60 x 36 x 1/2in. vapor intrusion is most likely to be a problem. Vapor Sentinel 20 mil barrier includes documented VOC diffusion ratings for BTEX, PCE, and TCE suitable for vapor intrusion projects. Class I barriers don't allow any amount of moisture to get through. Vapor barrier installation could cost anywhere from $1,200 to $4,000 on average. • 3M™ Air and Vapor Barrier 3015 adheres to most common building materials. The membrane brings together the. STC ratings determine airborne noises and IIC ratings measure the impactful sounds, such as. A vapor barrier should therefore be installed on the interior and exterior walls, making it a critical method to remedy the vapor problem that always manifests in the shower. 010", not 10mm. This type of insulation has a Kraft paper face with two flanges. Sentinel Moisture Barrier is a polyethylene film that provides a barrier for moisture. QuietWalk Plus Laminate & Wood Flooring Underlayment (Float, Glue, or Nail) with Vapor Barrier- Sound Reduction, Compression Resistant, Moisture Protection 6'Wx60'L Roll (Covers 360 sq ft). Vapor barrier may be installed I think. Vapor Mat is a heavy-duty, impact resistant, cuspated material that facilities a. 100% reinforced. Before installing the systems in 2007, EPA sealed cracks in basement walls and floors, and covered sump pits. Include window and door openings in exterior. This, of course, is in exchange for better. 50 per square foot; the cost variation is based on the thickness of the sheet. The older term "vapor barrier" is still used even though "vapor retarder" is. Charlie. ft. As most crawl spaces will require two rolls for completion, it could cost a DIYer as little as $140. 26. The vapor barrier lines the ground and walls within the crawl space and prevents moisture from entering. Roll Out and Cut Plastic Sheets. 08 PermsTemporary Fixes: If possible, undertake temporary repairs. A vapor barrier is a type of crawl space encapsulation material that specifically protects your crawl space and other areas of your property from water and moisture. ExoAir 130 is typically applied to exterior sheathing panels, concrete block, poured concrete or wood substrates as an air and vapor barrier material. Support our channel if you find our content valuable This video reveals how to make and install a 6 mil poly waterproof plasti. The attached vapor barrier is specially designed for an optimal bond with adhesives for easy installation. Vapor barriers restrict the flow. Barrier Seaming Tape is a low-permeance tape. Basement Vapor Barriers. Firstly, cut the vapor barrier to fit your basement – it should be at least 4 feet wide and 6 feet long. It rolls out and lies flat, with self-sealing seams making it simple to connect and form a continuous 6 mm vapor barrier between wood or. SKU: 100893247. Air Barrier Installation Detail: Interior Insulation Dam. Winston-Salem, NC 27103. While underlayment is not necessary for laying vinyl plank flooring, it can provide a lot of helpful benefits. 49. Air Barrier Installation Detail: Interior Air Barrier. 5 meters) from the barriers. Seal patch with seaming tape. Dry-Tek Environmental offers a helpful guide to installing a vapor barrier in your crawl space, including the necessary tools and materials. Economical mitigation strategy; Soil gas and moisture control. /roll) is designed for use under floated laminate, bamboo, and engineered wood floors and is ideal for many types of subflooring. They are installed on top of cement backerboard, which is over the studs. Ft. Seal Stego Wrap along all terminating. Its excellent R-value helps keep the floor more comfortable. No other materials are needed for install due to the Lip & Tape Design ensuring quick and easy install above, on or below grade. Best Practice Installation Techniques. Install a sump system if needed. Safe Handling Precautions Practice good housekeeping and personal hygiene and always wash hands after handling the product. In hot, humid climates, the air barrier and vapor retarder in the building envelope must be adequate to control air and moisture flow through the wall system. 1. A 6-mil sheet is considered a Class 1 vapor retarder, which is the minimum recommended thickness when installing a reinforced poly vapor barrier. Step 4: Attach the vapor barrier to the walls. Use the barrier seaming tape to repair and tighten up the damaged area around the pipe. Nucore is Floor and Decor’s exclusive in-house vinyl plank flooring brand. You can buy a barrier separately or get underlayment with a moisture barrier built-in. It’s best to have a professional complete this process as biohazards like mold, pest droppings, debris from burst pipes, etc. It effectively protects the concrete slab from moisture entering. A durable barrier system that saves on your bottom line. For a FREE no-obligation crawl space repair cost estimate in Salem, OR, please fill out the form and. I put the barrier on the inside to prevent condensation in my wall cavities. Actual 10 mil is equal to . Mold and mildew growth. Keeps moisture out; For use under all floating flooring; Includes an adhesive strip for overlap;. All pipe, ducting, rebar, wire penetrations and block outs should be sealed using Pango Claw and Pango Bond (Fig. With our vapor barrier installation services, there will be no issue of the crawl space of your home becoming a residence for pests, bats, and rodents. *The Small Hydraulic cylinder access cover should be on the secure side * As shown in picture 3 – Sentinel Placement Install the Sentinel Anchor Bars on the front of the frameWe would like to show you a description here but the site won’t allow us. Dimensions: 14 ft. Center seaming tape over small hole (s) or slice (s) in the vapor barrier. Sale. Size Of Your Project: Number of pieces. Moved Permanently. SENTINEL P200 HFB is reinforced with a tenacious, anti-wicking, weft-inserted polyester fabric that is encapsulated on both sides with a proprietary thermoplastic PVC formulation. Overlap any seams and tape them. A crawl space vapor barrier costs $0. Select the Vapor Barrier. 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. The basic principle is to create negative pressure by extracting air from beneath the building’s floor slab, reversing the sub-slab to indoor airflow, and preventing vapors from migrating into a building. 3in1 Blue Vapor Barrier Underlayment is universal and affordable. Rather than trapping moisture, this semi-impermeable vapor barrier, allows moisture to slowly dissipate through the flooring without mold. Cellulose. CALI. Exceeds industry-standard ASTM E 1745 class A, class B and class C specifications. Step #3: Installing Vapor Barrier and Insulation – When we have the correct fitting for your vapor. ) sheet of gypsum board sheathing. The higher the rating, the more effective at limiting sound. All seams overlap aClass II – These vapor and moisture barriers are semi-permeable, allowing some moisture to pass through (greater than 0. AVAILABILITY & COST Vapor Sentinel 10-Mil Vapor Barrier is available directly through. ft. The perimeter of a home is found by adding all of its sides together. Vapor barriers prevent moisture from moving from areas with a lot of moisture to areas with less moisture. easy installation with self - adhesive strip. In a typical commercial building or home, vapour barriers or vapour diffusion retarders can improve. Vapor Barrier Vapor Barriers provide additional protection between the subflooring and flooring by preventing the emission of vapors and moisture to the inside of the home. Roll flooring immediately after installation with a 100 lbs. No more than 3 – 90 degree bends should be made for any sentinel wedge installation. Pango Wrap Termite/Vapor Barrier. Building occupants, certain appliances, plants, and plumbing equipment generate moisture that is carried in the air as vapor. Silicone Vapor Shield (SVS) is the best-rated underlayment paper for moisture protection of hardwood flooring over plywood or OSB subfloors. We have housewrap outside the exterior plywood sheathing and will install 1" rigid foam prior to a rain-screen and then Hardie siding. Use a utility knife to cut the vapor barrier to size, if necessary. GREAT VALUE. Yes Show MoreStep Seven: Insulate the Bond. (xv) Vapor barrier sheet shall be installed without gaps or folds with 50mm overlap. Consult local building codes prior to installation and to determine the length to cut barrier. a. The vapor barrier blocks moisture from entering the crawl space and prevents water damage from developing in the area. Also, a special type of tape seals all of the seams between the sheets of vapor barrier. . This six-minute video provides everything you need to know to properly install Pango® Wrap Termite/Vapor Barrier below a concrete slab. Impermeable to the leakage of air. ROBERTS First Step Premium Underlayment - 630 sq. Finally, unroll the vapor barrier and press it firmly onto the concrete floor. It is incredibly common for homeowners to install a crawl space vapor barrier as a part of a wider waterproofing process. (may be higher, check job specifications or building codes) 4. The average installation time for a complete basement vapor barrier system is 1-2 days, depending on the size of the basement, the extent of any damage, and other necessary repairs. B. TOP. Seal Stego Wrap along all terminating. The concrete foundation of your building may feel rock-solid. ft. Crawl space vapor barrier cost - chartMoistureBlock™ 6-mil Vapor Barrier Flooring Underlayment. Flooring moisture barriers are placed beneath the floor’s underlayment. It’s worth noting that the thicker material your vapor barrier has, the more costly it will be. How did this project turn out? WATCH HERE: the easiest way to seal u. It features a 9 mil thick poly film, backed by a synthetic rubber adhesive, that is used for binding the seams of a moisture barrier when encapsulating a crawlspace. Average Price Per Square Foot: $2. Skip to main content. Document that the vapor barrier is intact prior to installation of concrete floor (ie. Some supports come with wide bearing pads. First, debris in your crawl space needs to be cleared out before installing a vapor barrier. Industrial Strength to Insulate Any Space. With a little bi. 00 per square foot, putting the total project cost at around $528 for the materials. The use of vapor barriers in residential construction began in the 1950s as a way to protect homes from moisture damage. 50 to $0. A moisture or vapor barrier prevents water from wicking up from the ground, through the sub-floor and absorbing into the hardwood floor. It is designed for use on all grades of the home or commercial property—below, on, and above grade installations. Installation of Stagestep Vapor BarrierVapor Sentinel New Construction is your ultimate vapor barrier solution for protecting. Although crawlspace vents were originally designed to facilitate humidity exchange with the outside air, they may contribute to mold. The basic vapor barriers we use here at The Crawlspace Ace are a thin sheet of black plastic, 6 mil thick, that spreads across the crawl space floor and overlaps at the seams. Vapor barriers may help you transform a dusty, moist basement into a livable space to enjoy time with your family. Avoid foam insulation that is faced with foil or plastic, to allow for some drying to occur through the foam. Failure to install a proper vapor retarder over concrete will likely result in a floor expanding. 33-ft x 3. Also this product is the exact same as. We offer Free in-store returns in case you need to return extra material. How Much Does It Cost to Install a Vapor Barrier? Depending on the thickness of the plastic, which ranges from 6 to 20 millimeters, a crawl space vapor barrier costs $0. Suitable for all types of subfloor including cement subfloor. It allows the user to create effective methods in detailing PVC-to-metal transitions. Vapor Sentinel New Construction Systems eliminate the need for costly trenching and aggregate backfill with its stronger-than-concreate gas-permeable layer. Thoroughly mix. It doesn’t let water or vapor through. Vapor Barrier Vapor Barriers provide additional protection between the subflooring and flooring by preventing the emission of vapors and moisture to the inside of the home. Determining the Need for a Vapor Retarder 6 . 4 mm Acoustical Underlayment with Vapor Barrier for All Vinyl Plank Flooring. 00 / piece Size: 300sqft Color: Green. Chances are that someone will have to slide around in the crawlspace later to fix a pipe or run. MOISTURE. Secure the edges of the vapor barrier to the concrete using tape or staples. Vapor Barrier Vapor Barriers provide. SOUND REDUCTION: Reduces sound transfer, making the floor quieter in the home. The thicker the barrier, the higher the cost, with barriers ranging from 6 to 23 millimeters in thickness. The cool surface is the sheathing, assuming no exterior insulation. For example, a basic vapor barrier will not provide extra padding. Common methods include stapling the barrier to the studs, taping the seams, and ensuring a proper overlap. I will agree that it is possible to install 6-mil polyethylene as an air barrier. . The function of a vapor barrier is to retard the migration of water vapor. The most famous "double vapor barrier" of them all is a classic compact flat roof. Subscribe Now:. Vapor barriers are often installed in the form of plastic sheets or foil sheet. An adhesive reduces its tendency to settle. When installing a vapor barrier, it should be placed against the concrete surface before insulation, wood framing, or any finishing. x 167 ft. 99 / piece Size: 10in. 0031 inches thick, and unfaced expanded or extruded polystyrene. Step 5: Seal any seams or gaps. See installation instructions and warranty information for more guidance. The plastic sometimes used on the warm-side of building walls (on the wall interior under drywall in northern climates) is a vapor barrier. 154 Results. Use a utility knife to cut the vapor barrier to size, if necessary.