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The layers of foam

In this article “R” Fairy Tale: The Myth of Insulation Values, David B. South from the Monolithic Dome Institute describes the application of insulation layers. “We use three inches for most of our construction. Two inches will do a very

Posted in Spray foam basics

The Typical Wall

Over “R” 20 Achieved In 2×4 construction!! Water vapour permeance is the speed at which water goes through a homogeneous material. The National Building Code stipulates that a vapour barrier must have a water vapour permeance of less than 1.05

Posted in Spray foam basics