Taming the Exfiltration Cascade: A Systems Dynamics Approach to Airtightness
This article is based on the latest industry practices and data, last updated in April 2026. In my 15 years as a senior consultant specializing in building performance and forensic diagnostics, I've seen the industry's approach to airtightness evolve from a simple checklist item to a complex, systemic challenge. The 'exfiltration cascade'—a term I coined to describe the chain reaction of failures triggered by uncontrolled air leakage—is the silent killer of building durability, energy efficiency