Install dimpled polyethylene to create an air space between the concrete and the finished floor, sealing off dampness and giving moisture a chance to dissipate. She’s planning to pour a new layer of concrete over the old and wonders what type of vapor barrier she should use. Jobsite Saw PRO has a wider table, a new dust-control port, and a more versatile fence, along with the same reliable safety mechanism included in all SawStop tablesaws. PERMINATOR ® underslab vapor barrier is a new generation of polyolefin-based resin/chemical technology. I can confidently say that I expect to be a life-long subscriber." Their 15 mil vapor barrier also controls radon gas, is resistant to hot/cold temperatures, resistant to soil chemicals & pollutants, and like I said allows virtually Zero water vapor transmission up through the slab. Special plastic sheets are laid on the ground before concrete is poured, completely isolating the slab from the ground. Water vapor leaves the surface of a concrete slab at a rate that is called the Moisture Vapor Emission Rate (MVER). When you read in a sealer data sheet that the MVER needs to be 3 pounds or 5 pounds, what that means is the number of pounds of water vapor per 1000 square feet per 24 hours. A concrete vapor barrier is simply a sheet of polyethylene plastic (Visqueen) placed directly on top of the sub-grade before the concrete floor or slab is poured to help keep moisture from the soil from passing up through the concrete. Hope this is useful. Does anyone one make a vapor barrier stong enough to keep out toxic spam? Starting with lower water-cement ratio concrete will let the slab dry faster. PERMINATOR provides the vapor barrier industry with a highly effective, economical choice for helping to reduce the penetration of moisture and water vapor through the slab into the structure, thereby helping to reduce fungus, mildew, and mold growth. ACI 302.2R-06, Guide for Concrete Floors that Receive Moisture-Sensitive Flooring Materials, estimates that concrete with a w/c of 0.5 will dry to an MVER of 3 pounds/1000 sq. But when adding insulation to an existing slab, the vapor barrier is laid over the top of the slab before the foam insulating panels are installed. Vapor retarders are typically specified according to ASTM E 1745 and have a permeance of less than 0.3 US perms (0.2 metric perms), when tested by ASTM E 96. But, are bullet proof vapor barriers really that important? Slab-Cote™ passes ASTM F 3010-13, moisture … Get complete site access to expert advice, how-to videos, Code Check, and more, plus the print magazine. This is a Homebuilding website not a place to promote someone's website for buying knock off junk. Become a member and get instant access to thousands of videos, how-tos, tool reviews, and design features. This water destroys the bond and the barrier fails. That’s the subject of this week’s Q&A Spotlight. The question is whether that point of view applies here. Buy the appropriate tape from the supplier, standard house wrap tape will not do. Checking out the 2016 National Hardware Show, SawStop's Portable Tablesaw is Bigger and Better Than Before, Podcast 307: Shed Foundations, Wasted Foam, and Deep-Energy Retrofits, Podcast 305: Asbestos Flooring, Panned Return Ducts, and Adding On to a Log Home, Plus, get an extra 20% off with code GIFT20, Simple Way to Make Old Walls Straight and Plumb, Expert insights on techniques and principles. Some suggest an active radon mitigation system be installed. This thicker material is much less susceptible to tears or punctures and has a lower permeance. All vapor barriers should conform to ASTM E-1745; but consider going with a barrier that has water vapor permeance less than 0.3 perms. Front-line technology produces an extensive line of water repellent products. wide concrete slab insulation is easy to handle, install and transport Insulation is a coated foil with a white poly surface With taped seams, the product is a vapor or radon retarder Not affected by moisture or humidity The use of a vapor barrier (more accurately termed a vapor retarder), having a water vapor permeance of less than 0.3 perm is frequently used to retard the flow of moisture through the slab. One of the ways to outsmart this problem is to create a “vapor” barrier on the surface of the slab. Vapor barriers also block gases, such as methane or radon. Since we were running hydronics, we laid down 4" of closed cell 3lb foam before pouring the slab. The 10-in. Ideas and new product releases each month! Reflectix 48 in. ACI 302.1, Guide for Concrete Floor and Slab Construction, states that the minimum thickness of an effective vapor barrier is 10 mils. Anyone that has had to face a moisture problem with a concrete slab understands the damage that excess moisture can cause. Thin plastic like this is often called a vapor retarder—meaning it slows the vapor down but doesn't stop it. It’s that Fick’s Law thing. Since the most common source is moisture in the ground beneath the slab, the solution is to completely take the ground out of the equation, by sealing the bottom of the slab. And dampness is only part of the problem, water vapor moving through a concrete floor can: But it doesn't have to be that way. A much better approach is a true vapor barrier, with characteristics that conform to the requirements of ASTM E-1745, "Standard Specification for Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs." Sure, that's an increase, but it's better than a damp, discolored slab. All Americover Vapor Barriers are composed of virgin polyolefin resins and offered in 10 mil, 15 mil, and 20 mil. Polyethylene (poly) plastic sheeting with a thickness of 10 mil or 15 mil is the most commonly used vapor barrier under slabs. The flooring is Pergo Outlast+ with built-in padding and barrier but since it is going on top of concrete it is recommended to put a > 6 mil vapor barrier underneath. The last thing you want your customers to envision when thinking of a concrete floor is a damp, cold basement slab. PERMINATOR EVOH (Underslab Gas Vapor Barrier): Designed to provide superior resistance to gas and moisture transmission, PERMINATOR EVOH is a highly resilient underslab gas/vapor barrier 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. Alt… Keep w/c at or below 0.5. The 15 mil thickness of this vapor barrier won't easily tear, split, or puncture allowing us to go about our work without having to repair holes while we are pouring the concrete. A 10-mil vapor barrier may be sufficient for residential construction in terms of puncture resistance, although the 10-mil barriers can't completely isolate the slab from ground moisture. The vapor barrier is a black, vinyl, slick surface - snapping chalk lines doesn't work well. The concrete vapor barrier we use the most is Stego Wrap's 15 mil thick vapor barrier. ACI 302.1, Guide for Concrete Floor and Slab Construction, states that the minimum thickness of an effective vapor barrier is 10 mils. Why A Plastic Vapor Barrier Under Concrete Slab Mondays WithInstall The Proper Type Of Vapor Barrier Siouxland HomesAre Vapor Ers Necessary For Bats And GaragesVapour Barrier Under […] She’s planning to pour a new layer of concrete over the old and wonders what type of vapor barrier she should use. The other characteristic of a good vapor barrier that makes it effective is resistance to punctures and tears. Many concrete sealers may prevent the intrusion of water but not water vapor. It is also possible that too much water or cement paste would be absorbed from the concrete by the sand, but probably not under most circumstances. We compiled this list of our favorite tools and gear to help you find great things to get for the handy people in your life. These vapor retarders are typically polyethylene or polyolefin sheeting materials. 6-mil plastic often gets damaged during placement of reinforcement and concrete, creating holes that can let a considerable amount of water vapor into the slab. Install a plastic vapor barrier: If your concrete passes the moisture test, then plastic sheeting at least 6 mils thick will prevent moisture from getting into your laminate flooring. ACI 302.1R-11 "Guide for Concrete Floor and Slab Construction," doesn't advocate universal use of vapor barriers but does make recommendations for their proper use. Buildings that are built on concrete slabs may already have a virtually permeance... 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