An I-beam, also known as H-beam (for universal column, UC), w-beam (for "wide flange"), universal beam (UB). Is a beam with an I or H-shaped cross-section. The horizontal elements of the "I" are known as flanges, while the vertical element is termed the "web". I-beams are usually made of structural steel and are used in construction and civil engineering.

Application: H beam and I beam can be found just about anywhere heavy duty weight support is required. They often support the main structure of a house and are commonly used under load bearing walls. They cost more to manufacture than a wooden beam, but provide great advantages in terms of strength.