Resource Library
Air Leakage Calculator
Overview
Use the SLA calculator to measure how much air is entering and escaping a building, helping to improve your overall air quality.
Quick Links
SLA stands for specific leakage area and is a method of describing how much air enters or escapes from a building (building air infiltration). The lower the number the tighter (less leaky) a building is. Air leakage is important as the air escaping from the building represents energy loss.
Buildings with high SLAs are drafty, uncomfortable, and hard to heat and cool. Conversely, a building with too low of an SLA can experience problems with moisture, and mold and have overall poor indoor air quality.
Use Efficiency First California’s SLA Calculator to calculate CFM50 for any area of conditioned floor space.
Related Resources
BPA: Building Science Principles Course: A Free Resource for Educators
This introductory course, presented in slideshow format, is designed to be a starting point for those interested in any career in residential energy efficiency. The course provides learners with basic information on how homes work through the lens of building science.
Weatherization Installer Job Aids and Single-Family Interactive 3D House
Weatherization job aids are step-by-step visual guides created to assist home energy professionals with effective, durable, and safe energy efficiency upgrades.
Workforce Development Toolkit for the Weatherization Assistance Program
This toolkit provides workforce development information and resources applicable to the Weatherization Assistance Program.