Our team

Our team at Larsen Zienkiewicz draws from over 40 years of combined experience in the construction industry, during which we have solved numerous building envelope challenges on new and existing structures. Our portfolio of successful projects includes respected medical and educational institutions in Southern California, leading national architectural design firms and top-ranked general contractors., and our work has earned the industry’s highest praise. We have a wealth of experience and a high standing among industry professionals, and we are very proud of the work we do.


Dean Larsen


Mr. Larsen has extensive experience in the design and investigation of roofing, waterproofing, exterior wall cladding, coatings, concrete and fenestration, building science and expansion jointson industrial, commercial, multi-family, historic and public sector projects.

Mr. Larsen provides consulting to business owners, developers, architects, attorneys and manufacturers in exterior enclosure design, investigation of moisture intrusion, storm damage assessment and failure of waterproofing, roofing and cladding systems. He has consulted on a vast variety of award-winning projects, including the Kaiser Permanente Medical Office Building in Murrieta, CA, Edie & Lew Wasserman Building at UCLA in Los Angeles, CA, Wilshire Boulevard Temple Renovation in Los Angeles, CA, Hollywood Palladium in Los Angeles, CA, and Clovis Community Medical Center in Clovis, CA.

Most recently the President of the Southern California Chapter of RCI, Inc. (So Cal RCI) and a member of the RCI, Inc. (RCI) Technical Advisory Committee, Mr. Larsen is also a past member of the National Board of Directors of RCI and the Cool Roof Rating Council (CRRC). In addition, he worked on multiple award-winning projects, which have won the Los Angeles Conservancy’s 2014 President’s Award and the California Preservation Foundation’s 2013 Preservation Design Award.


Szymon Zienkiewicz



Mr. Zienkiewicz has a strong technical background, and diverse project expertise in solving building enclosure challenges related to air, water, vapor and thermal control in the design, renovation, and investigation of buildings.  Mr. Zienkiewicz’s area of practice focuses on CSI Division 7-Thermal and Moisture Protection, 8-Doors and Windows, and 9-Finishes, with emphasis on air barriers, building science, coatings, expansion joints, exterior wall claddings, fenestration systems, insulation, interior waterproofing, and roofing.

Having consulted to building owners, developers, architects, and contractors on commercial, healthcare, institutional and residential buildings, both existing and new, Mr. Zienkiewicz is fluent in many project delivery methods, building construction types, construction process challenges, and client expectations. Mr. Zienkiewicz has consulted in various capacities on over 120 projects, and a few of of his more prominent engagements include the Kaiser Permanente Medical Center ED/OR/SPD Addition and Expansion in Woodland Hills, CA, the Loyola Marymount University Life Sciences Building in Los Angeles, CA, the South County Justice Center in Porterville, CA, and the Wilshire Grand Redevelopment Project in Los Angeles, CA.

Mr. Zienkiewicz is the current President of the Southern California Chapter of RCI, Inc, (So Cal Chapter) a regional chapter of RCI, Inc. (formerly the Roof Consultants Institute), a leading international association of building envelope consultants.  He has held many Chapter board positions since 2007, organized educational events for members, and regularly presented at seminars, furthering the Chapter’s initiatives and prosperity. Mr. Zienkiewicz is also actively involved in RCI’s Emerging Professionals and Chapter Development Committees at the national level, and has contributed to RCI for over 10 years. In 2016, Mr. Zienkiewicz received the Emerging Professional Award of Excellence from RCI, Inc.  The So Cal Chapter was recognized and awarded the RCI Outstanding Affiliated Chapter Award in 2016, and 2017.