The Knowledge Center

CSI Product Number System

MasterFormat® At Your Finger Tips

CSI Product Number System

The Construction Specifications Institute (CSI) publishes MasterFormat, a widely used numbering system for organizing specifications in most commercial building design and construction projects in North America. With a standardized numbering system, architects, specifiers, contractors, and suppliers can communicate more efficiently regarding building requirements, timelines, and budgets.

MasterFormat is under continuous maintenance. An annual subscription to the latest version may be purchased here.

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