The proper installation of an effective vapor retarder/barrier beneath the concrete has been proven to reduce or eliminate issues that arise when moisture migrates into If ground conditions require their use, a 3-inch (75-millimeter) layer of sand over the vapor barrier (and under the concrete) has been shown to reduce these problems. Do you have a product that might work for this? Not sure there was an actual water vapor barrier under the slab either. All Viper II products are tested and engineered to meet and exceed the Class A, B and C requirements outlined in ASTM E 1745 (Standard Specification for Plastic Water Vapor Retarders Used in Contact with Soil or Granular Fill under Concrete Slabs). In 2001, the recommendation changed to typically placing the concrete directly on the vapor barrier. "Vapor barriers aggravate the problems of plastic and shrinkage cracking. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework. by Steve Ragan, Director, Research and Technical ServicesThe answer to this controversial question, from both angles, is a qualified “yes.” Vapor barriers have been associated with certain concrete slab-on-grade problems including curling and cracking. Therefore, it is understandable that designers and contractors on both sides of the question have justifiable arguments that cannot be easily dismissed.Before one can make the best decision regarding whether or not to place a vapor barrier under a concrete floor slab-on-grade, it is important to understand the sources of moisture, how it moves through the slab, and how it adversely affects certain floor coverings, adhesives, and coatings.The excess or free water within the concrete is the source of some of the moisture in a slab. A: A vapor barrier is used under concrete slabs to prevent moisture migration from the soils. To better understand a material’s ability to slow moisture’s movement, for instance, vapor barriers are categorized into three classes depending on … Vapor Barriers Under Concrete Slabs. A. The previously had issues with the concrete "sweating" so they wanted to add a vapor barrier. In New South Wales, Clause 3.2.2.6 of the National Construction Code requires the damp-proofing membrane to be 0.2mm polyethylene HIGH impact resistance and branded continuously “AS 2870 Concrete … We surveyed nearly two hundred engineers, managers, educators and specialists who work with HMIs to understand how organizations are developing HMIs, the importance of HMIs to the product development process, and what tools are used to design and test HMIs. Elongation, Tongue Tear, Trapezoidal Tear and Load Yield are other tests that can tell you how strong the liner is under pressure. A vapor barrier is the key to waterproofing under a concrete basement or slab.Without a vapor barrier, moisture can lead to a damp floor, indoor humidity and mold. In our LEED V4 Platinum Edelweiss Demonstration house we installed a 10-mil underslab vapor barrier from WR Meadows, we found it to be extremely puncture resistant and our final radon test showed levels under 20 becquerels, far lower than the 200 becquerel level that Health Canada considers unsafe for longterm exposure. (Remember that concrete is porous and soaks up water like a sponge.) This process of vapor movement is termed “diffusion” and occurs in both soil and concrete. This water destroys the bond and the barrier fails. ASTM E 1745 is the most recognized industry standard for under-slab vapor barrier/retarders. Place the vapor retarder on top of the granular material and directly beneath the slab for moisture-sensitive floor covering and coating applications. Had a client who was installing an outdoor patio adjacent to their house. All too often, when a decision is made to include a vapor retarder the choice becomes 6-mil polyethylene commonly found on jobsites. So yes, a vapour barrier is required under a concrete slab for a Class 1 building (a dwelling) and for Class 10 (eg a garage) where the slab is continuous with the dwelling. slump, can contain between 1600 and 1700 pounds of free water in a 1000-square-foot area!The rate that moisture escapes from a slab depends on the concrete w/c, the density of the finish, the ambient conditions above the slab, and the moisture below the slab. Failure of floor coatings typically manifests as blistering. Thanks for the posts. However the ACI has since revised this recommendation because of their recognition that fill courses above the vapor retarder may sometimes take on water from rainfall, curing, or sawcutting. Do you think that the rain water would cause an issue in the patio even if an adequate slope was provided to drain the water? He did not have a good reason except that this was common knowledge not to do this. QUESTION: We are looking for a product that can be laid on a concrete slab to act as a vapor barrier between the concrete and the carpet we plan to put in our basement. I live in a single-level ranch style house but on a concrete pad. Bruce A. Suprenant Concrete Construction, April, 1992. Moisture in concrete can occur from a variety of sources: ground moisture that contacts the slab through either capillary action or as water vapor, high air humidity or drastic changes in relative humidity in its environment, leaking plumbing that passes through the slab, and more. Watertight concrete is often considered to have a w/c less than 0.50. We plan to install strandwoven click together solid bamboo floating floor over a moisture barrier on our ground floor concrete slab. A vapor barrier should be used for all concrete floors and slabs that are going to receive an impermeable floor finish like epoxy, laminate, linoleum, and wood or if the concrete floor will be used for any purpose where the passage of water vapor through the floor … It can even damage the concrete itself and corrode steel reinforcements within the concrete. Until 2001, the American Concrete Institute (ACI) recommended 4″ of granular fill be placed atop vapor retarders. Pulling the weeds that have sneaked through the narrow spaces between your garden-path or patio pavers can give you a real pain in the neck. Login. If mesh or rebar is part of the work, it is laid on top of the plastic, workers drive stakes through it to secure forms, and while placing concrete, further damage results from shovels, wheelbar… Sealers that stop all water tend to fail after a period of time because the water collects at the barrier/concrete surface. For a time in the 1980s and 1990s, ACI recommended using a "blotter" layer, on top of the vapor barrier. Water Vapor Transmission Rate (WVTR) test ASTM E 96 measures the water vapor transmission rate, or the rate at which water passes through the plastic sheeting vapor barrier. Thus, the vapor barrier has nothing to do with it. Without sufficient subslab moisture protection the total moisture in the slab will increase over time, and sawed contraction joints and random cracks will provide passageways for moisture to migrate through the slab. Use a low permeance vapor retarder to protect floor slabs that will be covered with moisture-sensitive floor coverings, adhesives, and coatings. One laboratory drying study indicated that 4-in. Before one can make the best decision regarding whether or not to place a vapor barrier under a concrete floor slab-on-grade, it is important to understand the sources of moisture, how it moves through the slab, and how it adversely affects certain floor coverings, adhesives, and coatings.

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