Before revision: A castellated beam is a beam style where an I-beam is subjected to a longitudinal cut along its web following a specific pattern in order to divide it, and reassemble the beam with a longer web by taking advantage of the cutting pattern.
After revision: A castellated beam is a beam style where an I-beam is subjected to a longitudinal cut along its web following a specific pattern in order to divide it, and reassemble the beam with a deeper web by taking advantage of the cutting pattern.