Joseph Lstiburek, Ph.D., P.Eng, presents an overview of the science behind creating the perfect wall, courtesy of Green Building Solutions.

Each 1-2 minute video covers an aspect of building science as applied to the challenge of creating energy-efficient, sustainable wall assemblies made to withstand the climate zones found in North America. 

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Part 1 - Intro to Building Science
What is a building, anyway? What does it do?
Part 2 - 2nd Law of Thermodynamics
How do heat and air (pressure) flow in a building?
Part 3 - Moisture Flow
How does moisture flow in a building?
Part 4 - The Environment
From arctic to tropical, arid to damp, how does climate affect building science?
Part 5 - Layers
What are the layers of a wall assembly and why are they each important?
Part 6 - Physics
How would an ideal theoretical wall assembly in any climate zone be arranged according to physics?
Part 7 - The Institutional Wall
What are the wall assembly features of the institutional wall, with a masonry structural system?
Part 8 - The Commercial Wall
What are the wall assembly features of the commercial wall, with a steel framed structural system?
Part 9 - The Commercial Wall (cont.)
Why is cavity insulation irrelevant for thermal protection in the commercial wall, but we may still want to use it?
Part 10 - The Residential Wall
What are the wall assembly features of the residential wall, with a wood framed structural system?
Part 11 - Flashing and Rain Drain
How is flashing important, and why is it shaped the way it is?
Part 12 - Flashing Back in the Day
How was flashing used in older construction? Can continuous insulation be integrated with it?
Part 13 - Draining Walls and Windows
In newer construction, how are punched openings flashed and why?
Part 14 - Granite Cladding and Rain
What is the real purpose of the cladding with respect to the water control layer?