The order upwards for the slab is.
Concrete slab plastic sheeting.
Plastic sheeting is a general purpose plastic film for use in a variety of construction and diy projects.
Polyethylene sheeting under concrete slab.
The concrete will be discolored anywhere the plastic touches it.
This plastic can be used to cover crawl spaces and as a temporary cover for equipment and supplies.
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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 the temperature is below 60 f use dark colored plastic sheets to absorb more light and boost the temperature.
Care is to be taken to ensure any penetrations by pipes or.
Joints are to be overlapped by not less than 200mm to ensure continuity and are continuously taped using 50mm duct tape.
Under slab vapor retarders play a very important role in retarding moisture from coming up through the concrete and into the structure.
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.
Condensed water pools wherever the plastic touches the.
Today most experts feel very strongly that engineered films designed specifically for use as vapor retarders should.
While plastic sheeting is highly effective in helping concrete cure without cracks there is a downside.
The bigger the mil number the thicker the plastic.
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.
If you plan on using an opaque stain on your concrete after it cures this doesn t matter.
If not tent the plastic so it doesn t come into direct contact with the concrete.
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A plastic polyethylene covering retains moisture in the concrete and improves temperature control.
When temperatures are higher than 85 f reflective white colored sheets help to keep the concrete cool as it cures.
The sheet shall be placed on the sub base so the bottom surface of the concrete slab is entirely under laid by the film.
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.
Check out our range of builders plastic products at your local bunnings warehouse.
Unfortunately there is a downside to plastic as well.
The hdx 20 ft.