Smoke Pencil Testing

What Is a Smoke Pencil Test?

A smoke pencil releases a thin, controlled stream of visible vapor. When used with natural or induced pressure differentials-such as those created by negative or positive air pressure, it visually reveals air movement through gaps in the air barrier system.

Ideal Applications

Window and door perimeters
Roof-to-wall and wall-to-slab transitions
Electrical and mechanical penetrations
Expansion joints and curtain wall interfaces
AVB (Air/Vapor Barrier) seams and terminations (chamber testing)

Benefits of Smoke Pencil Testing

Quick and cost- effective air leakage identification
Highly visual - see the air leaks in real time
Portable - ideal for spot checks during construction
Non-destructive - no damage to membranes or finishes
ASTM E1186- compliant - supports energy code and commissioning compliance.