The bottom profile of these structural members has the form of a parabola and this reflects the ideal moment distribution of the beam. As a result, the stress / strain characteristics of fish bellied beams are excellent. Due to their harmonious and aesthetic shape, fish bellied beams are often used when the structure of a building is exposed as an architectural feature. In situations like that of a single nave hall, the roof will be built as a single-pitch roof. If the hall has two or more naves with central support, a gabled roof will be realised. Fish-bellied beams can be used as ceiling joists, floor joists and as binding beams.