855773520-LEED-v5-ID-C-Reference-Guide-Launch-Edition-1 - Page 133
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any gaps in the process. Performing this review prior to the Cx readiness site visit also allows the CxP to determine timing for the required site visit.
Prior to Cx execution, the CxP must complete at least one site visit to verify Cx readiness.
Additional considerations Projects that have phased construction, and phased Cx testing, should consider multiple Cx readiness site visits that align with each phase of the construction efforts.
Execution of FPTs The CxP must witness FPT executed by the contractors and the subcontractors. Perform testing when all system components are installed, energized, programmed, balanced, and checked for functionality.
FPT sampling For projects that have a large quantity of similar system types, such as an office with multiple VAV boxes, a sampling strategy is acceptable for functional testing of those similar systems.
An acceptable sampling rate is typically 10%. When using a sampling rate, the CxP should consider the testing procedure’s failure rate. If multiple failures occur for the same equipment or system type, determine if there is a systemic issue.
Additional example: Sampling rate and failure eate A hotel has 200 fan coil units. The owner and CxP agree to a 10% sampling strategy. During testing, the CxP tests 20 fan coil units. If 10 of the 20 tested fail, additional testing is highly recommended. Failures of that magnitude would be cause for greater concern.
Seasonal or deferred testing The CxP can use seasonal or deferred testing, when necessary. For example, if the initial FPT effort occurs in the summer, tests for heating mode can occur during colder months. The CxP is responsible for amending the final report and other documents, once testing is complete.
Meetings During the construction phase, the CxP participates in at least one milestone meeting to discuss the commissioning findings and work toward resolution of identified issue.
U.S. Green Building Council LEED v5 Reference Guide for Interior Design and Construction, April 2025 Launch Edition 122