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Building Science for Weatherization
Fundamentals of Weatherization Project Management
Crew Chief Inspections

Visual Inspections

Evaluating Attic Ventilation

Evaluating Insulation Installation

Evaluating Ventilation Needs

Evaluating Electric Base Load
Diagnostic Testing
Managing Combustion Appliance Safety
Building Performance Institute Inc.

Evaluating Ventilation Needs

Any time we weatherize a house, it obviously makes it more energy efficient. In fact, we often call it "tightening" the house. But this increased airtightness can have some unintended repercussions. This lesson explains how to evaluate a building's airtightness and whether or not it needs mechanical ventilation after the weatherization work is completed.

After completing this lesson, crew chiefs will be able to:

  • Explain pressure differentials and backdrafting principles
  • Understand how to measure forced air changes using a blower door test
  • Calculate BTLs with the air volume method and the occupancy method
  • Explain the importance of bathroom exhaust fans being vented to the outside


Watch our example videos for this lesson by clicking on the link(s) below:
Evaluating Ventilation Needs

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