You need a vapor barrier under your concrete slab to protect it from moisture damage. This application can be the difference between a durable, long-lasting concrete patio and one that cracks and crumbles in a few years.
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A below-slab vapor barrier has a permeance rating of less than 0.01 perms to provide exceptional protection against water vapor diffusion. Making sure that vapor barrier meets ASTM E1745 Class A is important as well.
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Concrete slabs that will be within heated structures must have a vapor barrier. Subsection R506.2.3 of the 2018 IRC states that a minimum of 6-mil polyethylene vapor retarder be used between the concrete and the base course or prepared ground.
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The vapor barrier can be placed under the subbase, if the building is closed in when the dry subbase material is placed. Never punch holes in the vapor barrier to allow bleedwater to escape. Do not pound form stakes through the vapor barrier.
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Trapped moisture causes toppings to delaminate from the slab. Block water vapor emissions by applying a vapor barrier to the concrete before applying an overlay.
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A properly selected and installed polyethylene vapor barrier between the slab and the soil effectively keeps ground moisture away from the concrete to mitigate these issues. Anything less (or nothing at all) is a recipe for myriad problems down the road.
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How an Underslab Vapor Barrier Delivers the Best in Building Protection. Known as the best method as well as the most economical solution for controlling water vapor migration through concrete slabs, W. R. MEADOWS meets the two industry underslab vapor barrier standards in ASTM E 1993 and ASTM E 1745.
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Vapor barriers beneath a concrete slab stop vapor transmission and related problems. Learn why a quality vapor barrier is better than just using a sheet of plastic under your concrete.
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The new IRC guidelines have specified that vapor barriers used under concrete slabs should be Class A barriers and a minimum of 10 mils thick. Vapor barriers are classified as either class A, B, or C according to their level of tensile strength and puncture resistance.
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Discover our checklist and expert step-by-step instructions for an effective under-slab vapor barrier installation that will make your project a success.
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