Derek Trelstad joined Silman in 2006 and was promoted to Associate in 2007. His professional experience includes primarily historic preservation and renovation projects. Notable projects include restoration and alterations to accommodate new systems at St. Patrick’s Cathedral in New York, NY; ongoing work at the Cathedral Church of St. John the Divine in New York, NY; documentation of conditions and design of repairs at Cincinnati Museum Center in Cincinnati, OH; and existing conditions assessment and preservation plan for Montrose Placer Mining Company Hanging Flume in Uravan, CO.
Derek has been active in numerous industry organizations. He is a former elected board member of the Association for Preservation Technology (APT) International and is currently a member of APTI’s Partnership & Outreach Committee. Derek was the co-founder and Chair/Co-Chair of the APT Preservation Engineering Technical Committee from 2003-2009. He has previously been honored with an APT Presidential Citation for outstanding contributions to the field of preservation technology and in 2018, APT inducted him in the inaugural class of APTI Recognized Professionals. Derek was a consultant to the ASCE Metropolitan Section on the ASCE Guide to Civil Engineering Projects in and around New York City, 2nd Edition, for which he edited the “Buildings” section.