What is Building Enclosure Testing (BET)?
What is Building Enclosure Testing?
NEBB defines Building Enclosure Testing (BET) as “a process involving evaluation, verification, and documentation that the building’s design and construction meet defined performance expectations.” Simply put, it is a test to determine how airtight a building is. Doing so helps improve energy efficiency, improves comfort, and reduces the possibility of water leakage and mold growth.
Building Enclosure Testing is becoming a requirement for new construction projects across the country because the newest versions of the International Energy Conservation Code (IECC) are being adopted by more and more jurisdictions.
Performing BET helps owners and general contractors meet code requirements, reduce energy consumption, and provides comfortable environments for occupants.
What does the testing process look like?
Prior to going on site, our team meets with the client to discuss project requirements and understand testing goals.
We review construction documents to ensure there is a continuous barrier specified. The architect and construction team are notified of any possible concerns.
The NTi team develops a tailored testing plan for the site to minimize interruption and ensure accurate results. We discuss the plan with the construction team and ensure that all required penetrations are sealed off in preparation for our visit.
The actual testing is performed on site per NEBB and ASTM E1827 or ASTM E779 standards using our calibrated blower door equipment. While the building is under pressure, we use our thermal imaging camera to find areas of leakage. A blower door assembly is placed in the door frame, which pressurizes the building. This allows technicians to test for the air leak rate. To pass a building enclosure test, the air leak rate must be under a certain rate. We then review the results on site with the general contractor and provide a report with data analysis of the testing results, an executive summary, pictures, and thermal images.
Finally, we provide follow-up consultations as needed to discuss the results. When necessary, re-tests can be performed to ensure that repairs to the air barrier were successful.
Is it required?
While BET is not required nationally, it’s becoming code for more jurisdictions. In residential, it has been widely required for years and the jurisdictions adopting it are starting to increase. Commercially, it’s now required in jurisdictions like the city of Kansas City, Washington state, California, and Virginia. It’s also a requirement for many government jobs.
Why is building enclosure testing important?
The air barrier of a building is a large component of comfort and control. A proper barrier prevents any air leaks, prevents moisture and mold, and conserves energy. All these things provide comfortable, healthy environments for the building occupants.
As more general contractors and owners are getting requests for BET, NTi is here to be your national partner. NTi is NEBB certified, which means we have passed their rigorous certification requirements. Whether you are looking to navigate code requirements or diagnose building issues, we are here to help.
Do you have an upcoming new construction project that requires building enclosure testing? If so, reach out to the NTi team to learn more about the code, what’s required, and how we can help your building pass its test.
