Any combination of materials designed to stop the passage of moisture. Plastic sheets or treated papers and asphalt are used for membranes with sand fill.
Quality is influenced by type of materials and installation:
Low: Minimum polyethylene vapor barrier
Excellent: Built-up membranes with good sand fill
Enter the following for this component:
Percent of Total Floor Area: 1 – 100, or
Floor Area (Square Feet)
Floor Structure