WordNet
floor joist
n. joist that supports a floor
Usage examples of "floor joist".
Bullets whizzed by David's head and ricocheted around the basement until they embedded themselves in an overhead floor joist, the stairs, or one of the wooden doors.
Every floor joist was a challenge, and a couple of times he had to dig with his army-issue knife to make way for his head.
I saw one of the scavengers fall through, give a surprised yell, then climb, unhurt, onto a floor joist.