Concrete Slab Plastic Sheeting

Under slab vapor retarders play a very important role in retarding moisture from coming up through the concrete and into the structure.

Concrete slab plastic sheeting.

The bigger the mil number the thicker the plastic. The sheet shall be placed on the sub base so the bottom surface of the concrete slab is entirely under laid by the film. Covid 19 update to customers our metropolitan melbourne stores will remain open for trade customers only. Condensed water pools wherever the plastic touches the.

Joints are to be overlapped by not less than 200mm to ensure continuity and are continuously taped using 50mm duct tape. If the temperature is below 60 f use dark colored plastic sheets to absorb more light and boost the temperature. Check out our range of builders plastic products at your local bunnings warehouse. When temperatures are higher than 85 f reflective white colored sheets help to keep the concrete cool as it cures.

In the recent construction of our pre certified passivhaus in nj we did exactly what peter above described. The concrete will be discolored anywhere the plastic touches it. When plastic sheeting or curing blankets are placed atop a concrete slab much of the blanket is in direct contact with the concrete but there are also wrinkles and air pockets where the plastic remains suspended just above the slab. If you plan on using an opaque stain on your concrete after it cures this doesn t matter.

The order upwards for the slab is. Thin plastic like this is often called a vapor retarder meaning it slows the vapor down but doesn t stop it. Visit us today for the widest range of building construction products. We encourage retail customers to use our click deliver or drive collect service.

Unfortunately there is a downside to plastic as well. 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. A plastic polyethylene covering retains moisture in the concrete and improves temperature control. Care is to be taken to ensure any penetrations by pipes or.

The hdx 20 ft. Today most experts feel very strongly that engineered films designed specifically for use as vapor retarders should. 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. Polyethylene sheeting under concrete slab.

Commonly used under concrete slabs as a vapor barrier and on top of freshly poured slabs as a curing blanket. Plastic sheeting is a general purpose plastic film for use in a variety of construction and diy projects. 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.