ASHRAE currently publishes Continuous Maintenance standards every three years, with a Supplement published eighteen months after the Standard is published. In rare cases, addenda are published in between the eighteen-month periods. LEED development and ASHRAE standards development are not aligned and many addenda have been approved that would be useful for LEED project teams.
LEED project teams are required to use the ASHRAE Standard referenced in the applicable Reference Guide and are permitted to use addenda within the most recent Supplement to that Standard, as well as any approved addenda published in between the eighteen-month periods. Project teams are responsible for notifying LEED reviewers of the use of ASHRAE addenda utilized at the time of project documentation submission. If a project team elects to use an addendum to an ASHRAE Standard, this addendum must be applied to the entire LEED submittal.