ROXUL® Building Science, Dörken Systems along with Henry, Carter Architectural Panels and Alucoil discussed and shared in resolving common problems related to building design and construction. This full-day seminar provided 6 CONTINUING EDUCATION LEARNING UNITS and reviewed the following learning objectives: Understand key building science principles related to a building enclosure’s function and components. Recognize and apply critical design principles and strategies to improve building enclosure performance. Understand the in-situ performance of building enclosure materials and systems. Gain awareness of emerging issues and trends in building enclosure design that may influence design decisions and building performance.

1. 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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Arrhenius Equation

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Q$51&-3%*Q5&$*O3'9.$)

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Damage Functions
Water
Heat
Ultra-violet Radiation

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2nd Law of Thermodynamics

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In an isolated system, a process can occur
only if it increases the total entropy of the
system
Rudolf Clausius

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Heat Flow Is From Warm To Cold
Moisture Flow Is From Warm To Cold
Moisture Flow Is From More To Less
Air Flow Is From A Higher Pressure to a
Lower Pressure
Gravity Acts Down

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Moisture Flow Is From Warm To Cold
Moisture Flow Is From More To Less

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Moisture Flow Is From Warm To Cold
Moisture Flow Is From More To Less
Thermal Gradient – Thermal Diffusion
Concentration Gradient – Molecular Diffusion

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Thermodynamic Potential

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

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Commercial Enclosure: Simple Layers

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Rain Screen

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Beer Screen?

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138. 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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Air Leakage

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63)$47*8)&-9'($:**MKX

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Water Molecules

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Polar Molecule

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Size Matters

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