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Overview

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

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Overview

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  1. 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

  2. Learning Objectives PRESSURE & THERMAL BOUNDARIES 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

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

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

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

  6. Moisture PRESSURE & THERMAL BOUNDARIES Moisture flows with warm air through breaks in the air barrier, causing damage when it condenses on cool surfaces. Air Barrier Thermal Barrier

  7. Blower Door Test PRESSURE & THERMAL BOUNDARIES ΔP = -50 Pa Blower Door

  8. Zone Pressure Diagnostics PRESSURE & THERMAL BOUNDARIES Pressure difference of attic with reference to the house should be close to -50 Pa ΔP = -50 Pa Blower Door

  9. Zone Pressure Diagnostics PRESSURE & THERMAL BOUNDARIES Pressure difference of interior wall with reference to the house should be close to 0 Pa ΔP = 0 Pa Blower Door

  10. Where Is the Air Barrier? PRESSURE & THERMAL BOUNDARIES Cape Cod1½ Story House

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

  12. Where Is the Air Barrier? PRESSURE & THERMAL BOUNDARIES Targeted air sealing defines air barrier

  13. Where Is the Air Barrier? PRESSURE & THERMAL BOUNDARIES Pressure and thermalboundaries are now aligned

  14. Summary PRESSURE & THERMAL BOUNDARIES • 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

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