Fog Testing Technology
Visual air leakage testing that makes invisible air pathways visible, helping identify exactly where your building envelope is failing.
How Fog Testing Works
Fog testing uses non-toxic theatrical fog combined with pressure testing to reveal air leakage paths.
Building Preparation
Close all windows and exterior doors. Set up blower door to create negative pressure.
Fog Generation
Non-toxic theatrical fog is generated outside the building envelope or in specific areas.
Pressurization
Negative pressure draws outside air (and fog) through any gaps or cracks in the envelope.
Visual Identification
Fog streams become visible as they enter through leakage points, revealing exact locations.
Documentation
Photos and video capture the leakage paths for reporting and repair guidance.
Why Fog Testing?
Visual Confirmation
See exactly where air is leaking - no guesswork required
Easy Documentation
Photo and video evidence for reports and contractors
Precise Location
Pinpoint leakage to within inches for targeted repairs
Safe & Non-Toxic
Theatrical fog is safe for occupants and the environment
Common Leakage Points We Find
Fog testing commonly reveals air leakage at these critical locations in the building envelope.
Window Frames
Gaps between window frames and rough openings
Door Thresholds
Air leaks under and around exterior doors
Electrical Outlets
Penetrations through exterior walls for electrical boxes
Pipe Penetrations
Gaps around plumbing and HVAC penetrations
Recessed Lights
Air leakage through can lights in insulated ceilings
Attic Hatches
Poor sealing around attic access points
Baseboards
Gaps at floor/wall intersections
Exhaust Fans
Bathroom and kitchen fan housings
Fireplace Dampers
Leaky or damaged damper assemblies
When to Use Fog Testing
Best Applications
- Quality assurance during new construction
- Verifying air barrier continuity
- Investigating draft complaints
- Diagnosing comfort issues
- Training contractors on air sealing
Combined Testing
Fog testing is most effective when combined with other diagnostic methods:
- Blower door testing for quantitative measurements
- Thermal imaging to identify hidden pathways
- Moisture detection for related issues
Schedule Fog Testing
Contact us to learn how fog testing can help identify air leakage in your building.