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Dr. Joseph Lstiburek, P. Eng.

Dr. Joe is an engineer and founder of Building Science Corporation and buildingscience.com, one of the best sources for building science information available.

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HVAC & Mechanicals

Is 50% the RIGHT Amount for Relative Humidity?

Probably not, unless you are an art gallery in London or a hospital or a data processing center
Sept. 9, 2024
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Design

Lstiburek on Water: It is Unbalanced, Crazy—and Beautiful

Bulk water's job description is literally to rot houses, but the REAL danger occurs when it changes phase from liquid to solid, and gas...
Dec. 11, 2023
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Design

Adsorption: The Fourth State of Water (7 Minutes of BS)

Dr. Joe Lstiburek explains the fourth state of water: ADSORPED water, with a D. It exists on surfaces as tiny monolayers that fill pores and cause mold. It also explains why expansive...
Oct. 17, 2023
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Insulation & Air Sealing

Vapor Diffusion Ports: How to Keep An Unvented Roof Dry (7 Minutes of BS)

Like a ridge vent for moisture, vapor diffusion ports allow moisture to escape without leaking air
Sept. 19, 2023
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Roofing

Hot Roof, Cold Roof: Where Did the Terms Come From? (7 Minutes of BS)

Vented roofs are often called cold roofs because they are—(theoretically) cold from ventilation air
May 30, 2023