A Floor Joists is a timber beam that is perpendicular to the beam and parallel to the walls for providing a supportive framework to flooring. There are different types of floor joist used in construction.
What Is A Floor Joist?
I-Joist - APA – The Engineered Wood Association
Floor Truss Buying Guide at Menards®
Floor Framing & Structure
I-Joist - APA – The Engineered Wood Association
Deck Ledgers and I-Joist Floor Systems
Building Guidelines, Floors
CONSTRUCTION DRAWINGS
Joist - Wikipedia