Building Science

There is No Such Thing as a Free Thermodynamic Lunch

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

www.buildingscience.com

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A Building is an Environmental Separator

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Arrhenius Equation

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Damage FunctionsWaterHeatUltra-violet Radiation

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2nd Law of Thermodynamics

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Heat Flow Is From Warm To ColdMoisture Flow Is From Warm To ColdMoisture Flow Is From More To LessAir Flow Is From A Higher Pressure to a

Lower Pressure

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Thermodynamic Potential

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Change In Materials

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Rain Screen

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Beer Screen?

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Exterior Insulation Finish SystemsEIFS….aka “Synthetic Stucco”

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Exterior Insulation Finish SystemsEIFSBarrier SystemFace-Sealed Not Water Managed

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Stucco

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MaterialsInward DriveEnergy

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Traditional Lime Stucco Greater than 20 permsLime/Portland Cement Stucco 5 to 10 permsPortland Cement Stucco 1 to 5 permsPolymer Modification Less than 1

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Ancient Modification AdditivesCow DungEgg WhitesPig Blood

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Non Traditional Building Wraps

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Back To Lumpy Stucco….

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Easy Solution….

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Three Types of Controlled Ventilation Systems

Exhaust VentilationSupply VentilationBalanced Ventilation

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Kitchen Exhaust Hoods

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Clothes Dryers

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Fireplaces

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Building Science CorporationJoseph Lstiburek – Airflow 121

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Sweating Ducts

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Sweating DuctsLight Colored RoofsCool RoofsRadiant BarriersACCA Manual J, S and DASHRAE 62.2

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Ductwork Attic Dehumidification System

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