Yellow – A yellow scaffold tag typically requires the most information. It’s placed on a scaffold to indicate that it has been modified in order to meet specific work conditions, and should state that it “does not meet federal/state OSHA specifications.” The person responsible for the alterations should list the modification (such as “midrail missing at deck level”), as well as the additional protective measures required (such as safety belts). Yellow tags are intended for short-term, temporary use.
Yellow scaffold tags mean that (usually temporary) alterations have rendered
a scaffold unsafe for some but not necessarily all purposes.