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Building Science

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What is Spray Foam Insulation?

Spray Foam foam has exceptional air-sealing ability. When sprayed or injected into a framing cavity, it sticks tight to the sheathing and framing and rapidly expands to fill every crack and opening in the exterior shell. This is especially valuable around rim joists and other difficult- to-seal areas.

Insulation must be accurately cut to fit the joist or stud cavities, and an effective air barrier is needed to keep unconditioned outdoor air from penetrating the insulation foam eliminates many of the installation headaches associated with fibrous insulating materials.

Some types of foam are also effective vapor retarders, so it’s often possible to omit the separate poly or kraft-paper vapor retarder.

This energy saving technique of spray foam will drastically cut down the vast amount of energy loss that conventional insulating materials use, thus resulting in greater savings, and a more energy efficient building system.

Other Properties of Spray Foam

  • Provides a continuous air and vapour barrier
  • Prevents moisture infiltration through air leakage
  • Minimizes dew point problems and condensation
  • Avoids thermal bridging
  • Resists heat movement in all directions
  • Provides reliable performance under varying conditions
  • Helps reduce exterior noise
  • Creates a barrier against germs and odor
  • Retards insect and rodent penetration

topics: Incentives, Icynene, Education


After re-insulating my attic with Icynene, my home is significantly cooler in summer & warmer in winter.