The GBA Conversation: An Interview with Retired Editor Martin Holladay – GreenBuildingAdvisor

The GBA Conversation

GBA editor Randy Williams talks with longtime building science writer and retired GBA editor Martin Holladay. Martin reflects on building science, energy codes, and the future of housing

The GBA Conversation is our podcast series (the play button is in the middle of the above logo) featuring focused, practical discussions with the builders, designers, tradespeople, and industry professionals shaping better buildings. Rather than theory alone, we talk through real projects, real challenges, and lessons learned in the field.

Each episode is paired with a short companion blog like this one, highlighting the key takeaways for readers who want a quick summary—or a place to start before listening.

In this episode, I sat down with Martin Holladay, longtime GBA contributor and author of the column Musings of an Energy Nerd and the book of the same name. Although he officially retired as editor of GBA in 2019, his “retirement” has included a steady stream of thoughtful—and sometimes provocative—articles.

As he steps away from regular writing, we took the opportunity to reflect on the changes he has witnessed over decades in building science and residential construction.

The discoveries that changed how we build

Martin began building in 1974, during the energy crisis, when many builders and researchers were just beginning to figure out how homes worked. One of the biggest breakthroughs, he explained, came from research into air leakage.

Researchers at Princeton University—sometimes called the “Princeton House Doctors”—began studying how air moved through homes. One discovery was what researcher Gautam Dutt called the attic bypass, hidden pathways that allowed large amounts of indoor air to escape into the attic.

Today, most energy auditors recognize these immediately—utility chases, plumbing penetrations, and other holes connecting the house to the attic. But at the time, their impact wasn’t widely understood.

At roughly the same time, Canadian researchers were demonstrating what was possible with extremely airtight construction. The Saskatchewan Conservation House, completed in 1977, achieved about 0.8 air changes…