Vapor Barriers

Vapor Barriers


Description: Vapor barriers or vapor retarders are materials used to reduce and slow down the movement of moisture through a material. Properly defined, a vapor barrier alone does not control air movement; it controls the movement of moisture. In fact, a vapor barrier is not actually a barrier; it’s a vapor diffusion retarder (VDR). A VDR regulates moisture flow from inside out or from outside in at the molecular level.  VDRs are rated by the level of vapor diffusion control they provide. A material’s ability to retard the diffusion of water vapor is defined in terms of its permeability in units known as “perms.” This is a measure of the number of grains of water vapor passing through a square foot of material per hour at a known differential vapor pressure. Any material with a perm rating of less than 0.10 is considered a Class 1 vapor retarder.

Benefits of Vapor Barriers:

  • Improves Energy Efficiency
  • Resists Harmful Radon
  • Increases Resale Value
  • Prevents Structural Damage
  • Reduces Rust and Corrosion
  • Durability over the expected lifetime of the building

Systems Installed: Sheet-material, adhesive membranes (depending on composition), fluid-applied materials, insulating board stock, or medium density spray polyurethane foam.

Manufacture Affiliates: Tremco, Sika, Henry, Soprema

Warranties: Manufacturer material and labor warranties up to 5 Years, some including overburden removal and replacement.