RDH is committed to stewardship of historic places by providing high quality conservation services combined with our leadership in building science. Our focus is to help clients make informed decisions that lead to durable buildings.

Whether you are an owner wishing to showcase your landmark property, an architect adapting an existing building for new use, or a developer wanting to ensure your project has lasting durability, our building science and heritage conservation experts at RDH bring an unmatched depth of experience to develop innovative solutions.

As a leader in the building science consulting industry since 1997, RDH will be your historic building project’s trusted advisor, providing leadership from an initial building condition assessment, to design development, construction documents and tendering, then through contract administration and construction management. With 9 offices across North America, our team of experts include architects, building science specialists, structural and mechanical engineers, construction managers, and energy modellers on staff. As a result, we provide a wide range of services not typically available from other consultants.

We engaged RDH Building Science Inc. to assist us with a heritage preservation project for a building that was severely compromised. What was seemingly an overly complex problem, our goal of preserving the rich history of the building was reduced to simple and clear directions for us by RDH. Their deep knowledge, connections and respect within the industry led us to a brilliant solution. RDH seamlessly stepped in to handle the details, communications, and technology for the exterior building repairs, allowing us to focus on the development and the big picture. For us it was an “ah ha” moment: why didn’t we engage RDH sooner?

– Don Jackson, V.P. Silvercreek Commercial Builders


Interested in joining our team?

We’re always looking for individuals who have a passion for making buildings better and share our core values. Take a look at our current job openings on our careers page.

Our Leaders

Marcus Dell, M.A.Sc., P.Eng.

Senior Principal, Senior Building Science Specialist

Marcus is a professional engineer who specializes in practical solutions to building enclosure problems. He combines his academic training with over 20 years of work experience to offer all-around knowledge of the application of building science principles to buildings around North America. His focus at RDH is on existing buildings and repair, renewal, and rehabilitation projects.  In particular, he has advanced expertise in roof design and assemblies. He serves as a Director with RCI Inc, Western Canada Chapter and has published many papers and conducted research on a variety of roofing topics.

Paul Kernan, Architect AIBC, LEED AP

Managing Principal, Senior Building Science Specialist

Paul is a registered architect with a wide range of working experience in North America and Europe. For the last 15 years, Paul has specialized in building enclosure design and construction. Paul leads the building enclosure Repair, Renewal, + Rehabilitation (3R) service area at RDH.

Michael Aoki-Kramer, B.A., J.D., LEED AP

Managing Principal, Senior Building Science Specialist

Michael leads building enclosure projects for both new construction and rehabilitation. Michael’s experience as well as his knowledge of Washington State and Seattle Building, Mechanical, and Energy Codes are an asset to any project. He co-manages RDH’s Seattle office.

Sarah Gray, M.Sc., P.Eng., CAHP

Principal, Building Science Specialist

Sarah Gray brings her North American and international expertise to RDH’s Toronto office. Her work includes heritage rehabilitation, existing building condition assessment, and new construction enclosure consulting. Sarah previously served as a Board Member with the Canadian Association of Heritage Preservation (CAHP) and is currently a volunteer for the Association of Preservation Technology. With over 18 years’ experience in the building science industry, Sarah has worked on many historic buildings, including terra cotta rehabilitation at the 1 King West Hotel and Condo in Toronto, and the brick and sandstone repairs at Toronto’s Confederation Life Building, which won a Craftsmanship Award from CAHP. Recent work includes collaborating with RDH Building Science Labs on the testing and assessment of masonry buildings to receive interior insulation retrofits.

Chris Schumacher, M.A.Sc.

Principal, Senior Building Science Specialist

Chris Schumacher is recognized as an expert in the field of building monitoring, as well as enclosure and building systems testing. He has led the design, installation and analysis of monitoring systems for a variety of research programs and demonstration projects, both in the lab and in field locations around the globe. Chris’ formal education in architecture and engineering is balanced by almost two decades of experience in design, computer simulation, physical testing, and forensic investigation. Chris was the lead consultant on the development of the Historic Masonry Building Retrofit Guidelines for the US Military Academy and has consulted on several historic buildings including the Halifax Armoury Building in Halifax, NS as well as the Google Building in New York NY (in collaboration with BSC).

Dave Young, P.E.

Principal, Senior Building Science Specialist

Dave specializes in building enclosure consulting for both new and existing construction. His experience and expertise in historic building enclosures spans close to 30 years and includes work on the National Archives of Canada in Ottawa and the University of British Columbia Main Library.

One of Dave’s focus areas is to make historic buildings better by incorporating new enclosure technologies without changing the original aesthetics.  This includes implementing moisture control, thermal improvements, and air tightness strategies, while reinstating original materials. This approach was used on the 100 year old Oregon College of Oriental Medicine building in Portland, where corroded steel lintels above the windows were removed. The steel lintels were cleaned and protected, then reinstalled to create a new rainscreen cavity behind the brick veneer over the windows. The 3-wythe mass masonry wall above the lintels remained intact.