Building envelope commissioning employs various diagnostic testing methods to verify performance and identify deficiencies not visible through observation alone. However, it is essential that the project architect specifies the appropriate contractor testing requirements and methodologies so that the contractor can then self-perform or subcontract this scope of work. Purchasing envelope commissioning without proper design specifications and contractor or subcontractor testing requirements puts the project schedule and contingencies at risk.<\/p>\n
Note that there are building envelope testing sub-contractors available who will also self-perform building envelope commissioning. This approach blends contractor and professional services together in situation where the owner or design team prefer the contractor to own both testing and commissioning their own installations. Specialized and qualified subcontractors should be hired when blower door testing is specified.<\/p>\n
Blower door testing measures whole-building air leakage by depressurizing or pressurizing the building and measuring the airflow required to maintain the pressure difference. Results quantify building air-tightness and identify leakage locations for correction. Testing is typically conducted after substantial completion when the envelope is complete, but before interior finishes that might conceal deficiencies.<\/p>\n
Infrared thermography creates thermal images revealing temperature differences across surfaces. During blower door testing, thermal imaging identifies air leakage paths appearing as temperature anomalies. Thermography also reveals missing insulation, thermal bridges, moisture intrusion, and installation defects. Testing is most effective during cold weather when indoor-outdoor temperature differences are greatest. While anyone can buy this equipment, specifications should clearly spell out qualifications and certification criteria to ensure the field conditions and data generated by this equipment are interpreted accurately and communicated effectively to inform proper decision-making.<\/p>\n
Water testing verifies fenestration and wall assembly weather-tightness. Testing typically follows ASTM E1105 (Exterior windows, doors & curtain walls) or AAMA 501.2 (Storefront, curtain walls, and sloped glazing), applying calibrated water spray while monitoring for leakage. Testing is conducted on representative samples, typically focusing on challenging details and conditions. Specifying that the contractor is responsible for this testing and sourcing the water is necessary to prevent delays and possible change orders. Further specifying minimum water quality requirements will reduce potential damage from dirt and debris entrained in the water streams.<\/p>\n
Smoke testing identifies air leakage paths by introducing theatrical smoke into spaces and observing where smoke exits. This visual method effectively identifies specific leakage locations for correction.<\/p>\n
Moisture content measurement using electronic moisture meters or infrared thermography identifies elevated moisture in materials, revealing potential water intrusion or condensation issues before visible damage occurs.<\/p>\n
Testing timing is critical; tests must occur when deficiencies can be corrected efficiently. The commissioning plan should align with the architect’s specifications, identifying which tests will be conducted, sample sizes, acceptance criteria, and timing.<\/p>\n
This addresses only a few examples of the many tests that are available and may be required for your type of building envelope design. For comprehensive envelope testing and performance verification services, or help developing building envelope testing specifications, please contact Catalyst Commissioning Group at info@catalystcx.com.<\/p>\n","protected":false},"template":"","class_list":["post-857","faq","type-faq","status-publish","hentry"],"acf":[],"yoast_head":"\n