Denver

Andrew is a leading expert on the design and constructability of high-rise building enclosures in new construction. As a Senior Project Manager, he has consulted on numerous types of building enclosures, including unitized and stick-built curtain walls, window walls, precast concrete, masonry, and more. In addition to managing the construction phase on new construction projects, he plays a key role in the design, development, and review of construction documents. He assists owners, developers, architects and contractors in the selection of building enclosure systems to meet water penetration, airtightness, structural adequacy, energy efficiency, cost, constructability and maintenance goals. Andrew has traveled domestically and internationally to review unitized glazing facilities to assist in the performance testing and quality assurance review of new and custom enclosure systems.

In addition to his work on new construction projects, Andrew has provided due diligence review to support client purchases of several high-rise buildings. He also performs condition assessment and leakage investigation services for existing building projects.

Colin is a Professional Engineer in the United States and Canada and provides operational and project leadership in the San Francisco Bay Area office.

Colin has a broad knowledge of building construction and applies building science principles to analyze and design durable, energy-efficient building enclosures. He shares his experience by regularly speaking about topics related to building enclosures at events across the United States and contributes to industry organizations with the aim of making buildings better.

Colin began his career with RDH in Vancouver before transferring to the San Francisco Bay Area and now plays a key role as part of the leadership team for our California operations.

Voytek Gretka is a whole-building energy modeling specialist and professional engineer with experience throughout the U.S. and Canada, including both new construction and existing buildings in residential, commercial, and institutional sectors.

Voytek’s early career as an Energy Efficiency Standards Engineer with the British Columbia Ministry of Energy and Mines facilitated his involvement in energy codes and standards development across Canada and the West Coast of the US. Voytek continues to be involved in various technical committees and academic-industrial research partnerships.