10/27/2026
Why did we stop building homes with open foundations?
As homes evolved, so did the space underneath them.
Older homes often relied on open pier foundations that allowed outdoor air to circulate freely beneath the structure. But as ductwork, insulation, and electrical systems became common, builders began enclosing those spaces to protect the components underneath.
That transition introduced new considerations for moisture, ventilation, and indoor air quality.
In this walkthrough of a historic home, Dennis explains how foundation construction evolved and why understanding those changes matters when evaluating modern crawlspaces.
đź’¬ Did you know many older homes originally had completely open foundations?