Results are given as the air leakage rate, usually expressed in cubic feet per minute (cfm) per square foot of window or door area, or per linear foot of crack length. Reduced values of air leakage are indicative of superior performance, energy efficiency, and increased comfort. Results can be compared against project requirements, manufacturer data, or code requirements. Unforeseen performance can mean improper installation, broken seals, or faulty product.
ASTM E779 is used for whole-building air leakage tests, and ASTM E283 for laboratory measurement of air leakage through fenestration systems.
ASTM E783 Applications Industry
The test method is commonly used in quality control of construction, commissioning of new buildings, forensic investigations of building envelope failures, and checking of energy codes compliance.
ASTM E783 Materials Commonly Tested
This method is used on exterior fenestration products, including windows, sliding doors, hinged doors, storefronts, and curtain wall products. The approach measures their installed condition and not just the product itself, but also the influence of field workmanship and integration with surrounding construction.
ASTM E783 Common Challenges and Troubleshooting
Challenges may include accounting for environmental factors such as separating the leakage path through testing samples from those through adjacent walls or joints, maintaining proper seals of the test room, and environmental factors such as wind or temperature differences. Careful preparation, proper chamber installation, and adherence to the pressure control process are required for accurate and repeated results.
ASTM E783 Safety and Best Practices
Field testing involves the pressure-generating equipment and sealing materials. Fans, blowers, and sealing adhesives should be dealt with properly. Test constructions must provide safe access to the exterior surfaces and should not damage the windows, doors, or other surrounding finishes. Occupant comfort and building usage during testing should also be considered by personnel.
Importance of ASTM E783 Test Method
This method is an important tool in checking the performance of building envelopes under actual conditions. It facilitates energy conservation, indoor comfort, mitigates the risks of moisture intrusion, and ensures design and code compliance by providing a uniform method to survey air leakage from installed fenestration. This standard is part and parcel of creating lasting, effective, and quality building performance.
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