Slab Plastic Vapor Barrier
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Under slab vapor barriers done right professional builder.
Slab plastic vapor barrier. Polyethylene poly plastic sheeting with a thickness of 10 mil or 15 mil is the most commonly used vapor barrier under slabs. Stego wrap vapor barrier 15 mil is designed not only for effectiveness but also for longevity. 1 mil is equal to 0 001 inch of thickness. Are vapor ers necessary for bats and garages.
Waffle slabs require vapour barriers too and here are some photos that show a few waffle slabs with vapour barriers again before the concrete is poured. The slab is in fine condition. Infiltration of moisture from the ground through concrete slabs is a major building defect liability. I would like to put down an impermeable class 1 vapor barrier on top of the slab before i put down any flooring.
The slab has plastic sheeting underneath it already. This heavy duty plastic is commonly used under concrete slabs as a vapor barrier on top of freshly poured slabs as a curing blanket and as a temporary cover for equipment and supplies. The black plastic sheet that the reinforcement is sitting on is the vapor barrier. For most residential applications the 10 mil under slab vapor barrier will offer enough protection against moisture vapor transmission coming up through the concrete floor allowing for flooring materials to be successfully installed on top of the concrete.
Thin plastic like this is often called a vapor retarder meaning it slows the vapor down but doesn t stop it. 6 mil poly which is 0 006 inches thick and has a rating of 0 06 perms is also sufficient for most applications but may not be as commonly stocked as 10 mil or 15 mil. Barricade s 6 mil plastic sheeting is a general purpose plastic film for use in a variety of construction gardening and diy applications. Vapour barrier under concrete slabs the structural why files.
For most commercial applications the 15 mil thick concrete vapor barrier will be a better choice. My two main thoughts are potential mold growing under the vapor barrier and potential slab degradation. What risks are there to do so. While the permeance of the vapor retarder is important its ability to.
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. Why a plastic vapor barrier under concrete slab mondays with. 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. This vapor barrier is manufactured with only the highest grade of prime virgin polyolefin resins which allow this product to greatly resist.
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