Building Envelope Testing


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Building Envelope Testing (BET), also known as Building Enclosure Testing, addresses a distinct need within the construction industry in accordance with building energy, sustainability, and longevity. BET provides the ability to test and quantitatively report the performance of the air and water barrier layers of the building enclosures. BET is a process involving evaluation, verification, and documenting that the installation meets the building’s design performance expectations. It’s most often performed in new construction or renovations.

Building Envelope Testing results in better building performance by identifying air and water leakage locations during the testing of envelope components and assemblies. Often, the test failures help identify installation methods that can be corrected, assembly configuration issues, or component deficiencies. When addressed, these findings result in better envelope performance by decreasing air leakage and water intrusion.

NWESI has provided forensic, qualitative, and energy code services in Oregon, Washington, Idaho, and Montana since 2012. NEBB is a national organization committed to setting and improving third-party QA/QC testing disciplines through standardized procedural and testing methods using industry best practices while also supporting technical training and accreditation of its members.

Testing Protocol Experience
Air Barrier: ASTM E 779, ASTM E 783, ASTM E 1186, ASTM E 1827
Water Barrier: ASTM E 331, ASTM E 1105, AAMA 501.2, AAMA 502, AAMA 503
Thermal: ASTM C 1060, AAMA 1503, ISO 6781
Adhesion: ASTM D 4541, ASTM C 1521
Structural: ASTM E 330

BET of the air barrier quantifies the leakage rates and water infiltration locations at standard pressures and is either a regulatory or project specification requirement. Test areas can range from single windows, rooms, or multi-story buildings.

The Building Envelope Testing process is accomplished by using calibrated door fans, calibrated water spray racks, standalone sensors, and other equipment. Specific conditions and criteria are set per ASTM, to ensure repeatability of the results and meet requirements.