Polythene Sheet For Concrete

The use of polythene sheet in construction projects.

Polythene sheet for concrete.

My own advice is to install 6 mil poly and stop worrying. It is recommended that the sheet should be at least 0 25 mm thick 1200 gauge. The sheet is supplied in rolls 4 m wide by 25 m long. Today most experts feel very strongly that engineered films designed specifically for use as vapor retarders should be used as vapor retarders.

Polythene sheet roadway expansion projects must fill a number of requirements to minimise environmental impact. And to increase the effectiveness of the film and reduce its environmental impact polyethylene sheets can be rolled and stored for future re use. Roadways must be properly and effectively protected for safety and long term reliability concrete. Polythene or polyethylene sheet is commonly used as a damp proof membrane with oversite concrete for all but severe conditions of dampness.

Construction poly sheets are mainly used for the construction sector. Oversite concrete slabs employ a 1000 guage 250 microns polythene sheet laid underneath the concrete to prevent the moisture from being absorbed. Polyethylene sheeting under concrete slab. The general standard employed for the testing and verification of polythene sheets for use as a vapor barrier is the astm4397.

Polythene or polyethylene sheet is commonly used as a damp proof membrane with oversite concrete for all but severe conditions of dampness. Whenever i have seen holes drilled through concrete slabs i have never noticed any degradation in the polyethylene layer. Although it may seem water tight this grade of material allows a lot of water vapor to pass through. It helps in separating the dry ground and the wet concrete.

As long as the polyethylene is protected from sunlight as it obviously is when it is installed under a concrete slab it should last indefinitely. These products are made. So that concrete can take its own time for dry and avoids the possibilities of cracks and other damages. It is recommended that the sheet should be at least 1000 gauge.

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. Recently though research has shown that the old traditional layer of 6 mil visqueen polyethylene plastic under the slab is seldom effective for two main reasons. Under slab vapor retarders play a very important role in retarding moisture from coming up through the concrete and into the structure. 6 mil plastic often gets damaged.