Vapor Barrier

Definition

A vapor barrier is a waterproof membrane placed under concrete floor slabs that are on grade to prevent moisture from penetrating the concrete and entering the building.

Purpose

The main purpose of a vapor barrier is to control moisture and prevent it from rising into the building from the ground. This helps in avoiding issues such as mold growth, structural damage, and deterioration of flooring materials.

Examples of Use

• Residential Construction: Installing vapor barriers under basement floor slabs to prevent moisture infiltration.
• Commercial Buildings: Using vapor barriers in commercial structures to protect against moisture damage and maintain indoor air quality.
• Industrial Facilities: Applying vapor barriers under concrete slabs in warehouses and factories to ensure dry conditions for stored goods and equipment.

Related Terms

• Moisture Barrier: A material used to prevent moisture from passing through walls, floors, and ceilings.
• Concrete Slab: A flat, horizontal surface made of concrete, commonly used in building construction.
• Dew Point: The temperature at which air becomes saturated with moisture and water vapor begins to condense.

Notes

Proper installation of vapor barriers is critical to their effectiveness. They should be continuous and sealed at seams and penetrations to ensure a complete barrier against moisture.

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