Polythene Sheet For Concrete Slab

Undisturbed soil crushed stone 4 inches of type i eps 6 mil polyethelene sheet another 4 inches of type i eps and then the 4 inch concrete slab for a total insulation value of r30.

Polythene sheet for concrete slab.

Currently what little evidence i have indicates that polyethylene under slabs degrades over time. Under slab vapor retarders play a very important role in retarding moisture from coming up through the concrete and into the structure. So that concrete can take its own time for dry and avoids the possibilities of cracks and other damages. A vapour barrier in concrete slabs full basements and crawl space construction.

As polyethylene is a relatively new plastic scientists are busily exploring and developing new applications for the products. As the concrete begins to shorten some cracking can occur because the subgrade resists slab movement. Typical 8 mil polyethylene sheeting costs 5 to 7 cents per square foot. However this list is a summary of current applications.

Slip sheets reduce this frictional resistance and help reduce cracking. A slip sheet is a layer of material placed between the slab and the subgrade to reduce the friction between them. The order upwards for the slab is. Is there information available such as research case studies and field experiences that documents the long term performance of polyethylene sheets used as vapor barriers beneath concrete slabs on grade.

Construction poly sheets are mainly used for the construction sector. Often referred to as construction and agricultural film c a film it is used most frequently in concrete slab preparation wall construction floor underlayment crawl spaces pit covers and landscape mulching. These products are made. It helps in separating the dry ground and the wet concrete.

This is because polyethylene allows the passage of oxygen and carbon dioxide. The general standard employed for the testing and verification of polythene sheets for use as a vapor barrier is the astm4397. Roly poly heavy duty 6 mil black polyethylene sheeting on a roll is perfect for many industrial commercial construction residential uses. When a concrete slab dries it shrinks.

Keep w c at or below 0 5. Today most experts feel very strongly that engineered films designed specifically for use as vapor retarders should be used as vapor retarders. 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. Radon is the second leading cause of lung cancer in the u s according to the american lung association.

Polyethylene sheeting under concrete slab. Vapor barriers also block gases such as methane or radon.