Build SMART For Designers

Tim McDonald, an architect, developer, and builder for Onion Flats LLC in Philadelphia, received his Passive House certification nine years ago. When he started, designing a building to Passive House levels of efficiency came with several challenges. β€œIt was from scratch in all ways,” he says. I had to think through the most effective way to design the thermal envelope, the air barrier and the weather resistant barriers. I had to figure out the details of how a window joined with the wall so that it not only shed water but maintained the air tightness of the thermal envelope.”

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