Building Science

Adventures In Building Science

Joseph Lstiburek, Ph.D., P.Eng, ASHRAE Fellow

www.buildingscience.com

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What is a Building?

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A Building is an Environmental Separator

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•  Control heat flow •  Control airflow •  Control water vapor flow •  Control rain •  Control ground water •  Control light and solar radiation •  Control noise and vibrations •  Control contaminants, environmental hazards and odors •  Control insects, rodents and vermin •  Control fire •  Provide strength and rigidity •  Be durable •  Be aesthetically pleasing •  Be economical

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Water Control Layer Air Control Layer Vapor Control Layer Thermal Control Layer

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Window

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•  Structure

•  Rain/Air/Vapor

•  Insulation •  Finish

Commercial Enclosure: Simple Layers

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9/22/15

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Rain Screen

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Beer Screen?

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Rockwool 1x3 furring @ 24” o.c. #10 screws @ 16” o.c. vertically Result: 20 psf cladding weight with < 2/100” deflection

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