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Interlock Metal Roofing
  • Company
    • About Us
    • Catalog
    • Blog Posts
    • Roofing Guide
    • Quality Assurance
    • Industry Partnerships
    • Community Support
    • Environmental Responsibility
    • President’s Message
    • Mission Statement
    • Events
    • We’re Hiring!
  • Products
    • Slate​​
    • Cedar Shingle
    • Shake
    • Mediterranean Tile
    • Standing Seam
    • Copper
  • Warranty
  • Specifications
    • Manuals
    • Testing Reports
    • Tax Credits
    • CRRC Rated
    • Coating
    • Color Guide
    • Roof Visualizer ↪
    • Downloads
  • Gallery
  • Reviews
  • Contact Us

Vapor retarder

Home / Glossary

A vapor retarder, also known as a vapor barrier, is a type of building material used to prevent the diffusion of water vapor through walls, ceilings, and roofs. Water vapor can cause significant damage to building materials, leading to structural decay and the growth of mold and mildew. Vapor retarders are designed to control the flow of moisture through a building envelope by reducing the amount of water vapor that can enter or exit the structure.

Vapor retarders can be made from a variety of materials, including foil, plastic, and paper. The effectiveness of a vapor retarder is determined by its perm rating, which measures the amount of water vapor that can pass through the material over a given period of time. The lower the perm rating, the more effective the vapor retarder is at preventing the flow of moisture.

When installing a vapor retarder, it is important to ensure that it is properly sealed and installed in the correct location. A vapor retarder is typically installed on the warm side of the insulation, which is the side that faces the interior of the building. It should be installed in such a way that it forms a continuous barrier, with no gaps or holes that would allow moisture to pass through.

Overall, the use of a vapor retarder is an important consideration for any building project, as it can help to prevent moisture-related damage and improve the overall durability and longevity of the structure.

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© 2023 The Interlock Group. Interlock®, Interlock Lifetime Roofing Systems®, Alunar®, and Never Re-Roof Again.® are registered trademarks of I.E.L. Manufacturing Ltd. and are used under license.

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