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Flitch beam
A flitch beam (or flitched beam) is a compound beam used in the construction of houses, decks, and other primarily wood-frame structures. Typically, the flitch beam is made up of a steel plate sandwiched between two wood beams, the three layers being held together with bolts. In that common form it is sometimes referenced as a steel flitch beam. Further alternating layers of wood and steel can be used to produce an even stronger beam. The metal plate(s) within the beam are known as flitch plates.〔"flitch, n. 1. def. 3. c. ''Oxford English Dictionary'' Second Edition on CD-ROM (v. 4.0) © Oxford University Press 2009〕 ==Advantages== Because flitch beams are significantly stronger than wood alone they require less depth than a wood-only beam of the same strength, are much lighter than a steel beam of the same size, and can still be nailed to the rest of a wooden structure. Flitch beams can also be created from existing in-situ joists or beams permitting easier renovations.
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