Commissioning vs test and balance is a question that comes up on most commercial closeouts. The two trades overlap on schedule and on equipment touched, but the deliverables are different. Owners and GCs deciding commissioning vs test and balance scope should understand what each delivers and why most commercial projects need both.
Commissioning vs test and balance — what each trade verifies
First, commissioning verifies that every sequence, sensor, damper, and valve in the BAS behaves as designed. Then test and balance proves that every device on the air and water side hits design flow. Specifically, commissioning under ASHRAE Guideline 0; TAB under ASHRAE 111.
Commissioning vs test and balance — where the scopes overlap
Additionally, the two trades coordinate on functional testing because TAB data feeds commissioning verification. Furthermore, commissioning findings often trigger TAB rework. Therefore, the right sequence places both on the closeout schedule with daily coordination during the punch phase.
Commissioning vs test and balance — what owners receive
However, the deliverables stay distinct. The commissioning report cites the relevant TAB data. The TAB report supports the commissioning verification. Therefore, owners receive two documents that work together, not one document with both scopes blended.
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