OAR 806-010-0115 states that modifications which become part of change orders and/or addenda to alter technical submissions must bear the stamp and signature of the registered architect responsible for the modifications.
What about responses to requests from contractors for information (RFI) about construction documents? Do RFI responses need to be stamped and signed?
Responses to RFI do not change construction documents. Responses to RFI clarify construction documents or point to information already in construction documents. If a response to an RFI changes construction documents, then the response should be issued in a change order, addendum, construction change directive, or architect's order for a minor change (architect's supplemental instruction) that is stamped and signed by an architect.