Slab Plastic Vapor Barrier

While the permeance of the vapor retarder is important its ability to.

Slab plastic vapor barrier.

Why a plastic vapor barrier under concrete slab mondays with. Under slab vapor barriers done right professional builder. I would like to put down an impermeable class 1 vapor barrier on top of the slab before i put down any flooring. Thin plastic like this is often called a vapor retarder meaning it slows the vapor down but doesn t stop it.

For most commercial applications the 15 mil thick concrete vapor barrier will be a better choice. The slab has plastic sheeting underneath it already. What risks are there to do so. These vapor retarders are typically polyethylene or polyolefin sheeting materials.

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. 1 mil is equal to 0 001 inch of thickness. Polyethylene poly plastic sheeting with a thickness of 10 mil or 15 mil is the most commonly used vapor barrier under slabs.

Install the proper type of vapor barrier siouxland homes. Vapour barrier under concrete slabs the structural why files. Stego wrap vapor barrier 15 mil is designed not only for effectiveness but also for longevity. This vapor barrier is manufactured with only the highest grade of prime virgin polyolefin resins which allow this product to greatly resist.

Infiltration of moisture from the ground through concrete slabs is a major building defect liability. 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. The black plastic sheet that the reinforcement is sitting on is the vapor barrier. 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.

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 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. 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. My two main thoughts are potential mold growing under the vapor barrier and potential slab degradation.