1. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Overview Introduction to the Weatherization Assistance Program Communication Skills House as a System Building Science Basics Blower Door Basics Pressure and Thermal Boundaries Combustion Safety Worker Safety Materials, Tools, & Equipment Typical Weatherization Measures Mobile Home Basics Multifamily Basics 1

2. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Learning Objectives By attending this session, participants will: Understand the difference between the thermal boundary and the air or pressure boundary, and the behavior and function of each Know the proper location of the pressure and thermal boundaries Know common sites for breaks in the pressure and thermal boundaries Understand what is meant by inside and outside in terms of air barrier, and how a blower door is used to determine that 2 PRESSURE & THERMAL BOUNDARIES

3. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Thermal & Air Barriers For maximum efficiency and comfort, the thermal and air barriers must be continuous and in contact with each other. PRESSURE & THERMAL BOUNDARIES 3

4. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Thermal & Air Barriers Thermal Barrier Air Barrier An uninsulated attic hatch is a gap in the attic’s thermal barrier 4 PRESSURE & THERMAL BOUNDARIES

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6. 6 A mechanical chase containing ducts can break the attic’s air barrier PRESSURE & THERMAL BOUNDARIES Thermal Barrier Air Barrier

7. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Moisture 7 Thermal Barrier Air Barrier Moisture flows with warm air through breaks in the air barrier, causing damage when it condenses on cool surfaces. PRESSURE & THERMAL BOUNDARIES

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13. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Blower Door Test Blower Door 13 ΔP = -50 Pa PRESSURE & THERMAL BOUNDARIES

14. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Zone Pressure Diagnostics Pressure difference of attic with reference to the house should be close to -50 Pa 14 Blower Door ΔP = -50 Pa PRESSURE & THERMAL BOUNDARIES

15. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Zone Pressure Diagnostics 15 ΔP = 0 Pa Pressure difference of interior wall with reference to the house should be close to 0 Pa Blower Door PRESSURE & THERMAL BOUNDARIES

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26. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? Cape Cod 1½ Story House 26 PRESSURE & THERMAL BOUNDARIES

27. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? 27 Pressure difference of the floor cavity with reference to the house should be 0 Pa. But, is it? PRESSURE & THERMAL BOUNDARIES

28. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? 28 Targeted air sealing defines air barrier PRESSURE & THERMAL BOUNDARIES

29. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Where Is the Air Barrier? 29 Pressure and thermal boundaries are now aligned PRESSURE & THERMAL BOUNDARIES

30. WEATHERIZATION ASSISTANCE PROGRAM STANDARDIZED CURRICULUM Summary For maximum efficiency and comfort, the thermal and pressure boundaries must be continuous and in contact with one another Electrical and mechanical chases, missing top plates, knee walls and dropped ceilings are common trouble spots Pressure diagnostics determine location and condition of air barrier Zonal pressure readings in conditioned spaces should read close to 0 WRT inside Targeted air sealing defines the pressure boundary 30 PRESSURE & THERMAL BOUNDARIES