He theorized that, because of the balloon-frame construction of the building and the fire showing both in the basement and the attic, the fire already spread within the walls and that the ceilings ...

Tom: Then we're going to light this on fire to see how flames and smoke travel through a balloon-frame structure. Terrence: You can see, actually, the combustibles lighting up right now ...

It's called "balloon frame" construction, and thousands of homes around the region have it. A fire that gutted a balloon frame home in Allentown on Sunday started small, with a family making ...