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What Thickness Plastic Under Concrete?

The most commonly used vapor barrier under concrete slabs is polyethylene (poly) plastic sheeting with a thickness of 10 mil or 15 mil.

What Thickness Plastic Under Concrete?

As you lay a new concrete slab, you might wonder what kind of plastic, if any, you should put down first.

While some people believe that any type of plastic will suffice, others believe that only certain types or thicknesses of plastic are appropriate for use under concrete.

The purpose of plastic under concrete is twofold. First, plastic helps to prevent moisture from evaporating from the ground and causing the concrete to dry too quickly, which can lead to cracking.

Second, plastic provides a barrier between the concrete and the ground, which helps to prevent the concrete from absorbing moisture and becoming stained.

There are a variety of thicknesses of plastic available for use under concrete, ranging from thin sheets to thick tarps.

While the thickness of the plastic you use will depend on the soil conditions and the amount of moisture in the air, a general rule of thumb is to use a thickness of at least 4 mils (0.1 mm).

If you live in an area with high humidity or are laying concrete in the summer months, you may need to use a thicker plastic to prevent the concrete from drying too quickly. In these cases, a thickness of 6 mils (0.15 mm) or more is recommended. When choosing

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