Inside the Envelope

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We are excited to announce our new Principals, Associate Principals, and Associates of 2025! Their...

Net-zero is typically defined as a building that produces as much energy as it consumes...

In celebration of Women’s Equality Day, we spoke with Kristen Yee Loong, Energy and Sustainability...

Every year, the Passive House community comes from all over the world to gather at...

The 2008 edition of NAFS first appeared in Canada in the 2010 National Building Code,...

In 2015, the Seattle Energy Code saw increased strictness in airtightness requirements with the maximum...

Over the course of its service life, a building’s façade endures monumental environmental forces including...

Note: The public review has now ended. NAFS, the North American Fenestration Standard, is jointly...

“So, what’s next?” This question has been posed to me not once, but twice over...

Whenever Canadian building codes refer to the North American Fenestration Standard (NAFS), they also refer...

In the simplest terms, building airtightness refers to a building’s resistance to air leakage—air flowing...