Airtightness for Facades – Guide for Facade Contractors
Facade contractors are responsible for some of the most critical airtightness junctions. This guide covers key detailing requirements and installation best practices.
Why Facades are Critical
The facade system — including glazing, cladding, and curtain wall — typically accounts for 60–70% of all airtightness defects found in commercial buildings. Getting facade airtightness right from the start significantly reduces remediation costs and testing risk.
Key Junction Details
The most critical details are: window perimeter seals, mullion and transom connections to the primary structure, and the interface between the facade and the floor slab.
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