Mark Siwik

Senior Architect | Building Envelope Director

Mark Siwik, AIA, LEED AP BD+C has been on over 350 roofs—when building owners have a leak, they call him. He conducts building envelope forensics to pinpoint the leak’s source, whether it’s on a roof or within a masonry wall. Mark has done single building and campus-wide assessments for facilities ranging from schools and hospitals to public works facilities and train stations.

Mark also observes construction of projects designed by Legat. He relies on over 30 years of experience to make sure owners get what they paid for in the plans and specifications. He ensures that contractors or construction managers correct all deficiencies.

Mark earned his architectural degree from Southern Illinois University.