Polyethylene Vapor Barrier

Definition

A polyethylene vapor barrier is a sheet-form thermoplastic membrane made from a high-molecular-weight organic compound, used as a protective cover to prevent the passage of air and/or moisture.

Purpose

Polyethylene vapor barriers are installed in building construction to prevent moisture and air infiltration, protecting against mold, mildew, and structural damage caused by condensation.

Examples of Use

• Building Foundations: Placed under concrete slabs to prevent moisture from rising into the building.
• Wall Construction: Installed within wall assemblies to block moisture and improve insulation performance.
• Crawl Spaces: Used to cover the ground in crawl spaces to control humidity and prevent mold growth.

Related Terms

• Moisture Barrier: A material used to prevent the passage of moisture into buildings.
• Air Barrier: A system that controls the flow of air into and out of a building.
• Insulation: Material used to reduce the rate of heat transfer.

Notes

• Installation: Proper installation is crucial to ensure an effective seal and continuous protection against moisture.
• Thickness: Available in various thicknesses, with thicker barriers providing greater protection.