Building Definition Language

Performance Requirements define measurable outcomes that shall be achieved under specified conditions.

Performance categories may include:

structural behavior;

energy;

thermal comfort;

air quality;

acoustics;

water use;

electrical efficiency;

durability;

reliability;

maintainability;

assembly time;

robotic readiness;

recovery time;

affordability.

Each Performance Requirement shall define:

metric;

subject;

target;

minimum or maximum threshold;

operating condition;

measurement period;

test or calculation method;

permitted uncertainty;

verification stage;

evidence.

Example:

performance_requirement PR_Envelope_Air_001 {

subject: @Building_Envelope_System;

metric: air_leakage_rate;

maximum: 1.5 ACH_at_50Pa;

configuration: as_completed;

verification: @Whole_Building_Air_Test;

}

Performance may be declared at several levels:

Component;

Assembly;

system;

Zone;

complete building.

Component-level performance shall not automatically establish whole-building performance where joints, penetrations, controls, installation, or system interaction affect the result.

Performance targets shall distinguish:

design target;

minimum acceptance value;

commissioned result;

current measured result;

degraded limit;

end-of-life threshold.