STRUCTURE OF ROOF OF BUILDING

PROBLEM TO BE SOLVED: To provide the structure of a roof proper to application to a building such as a large-scale factory. SOLUTION: High roof surfaces 3 are formed of high beam-framing trusses 2 while low roof surfaces 5 are formed of low beam-framing trusses 4 by combining and building the high beam-framing trusses 2 and the low beam-framing trusses 4 under the state, in which the lower chord surfaces of the trusses 2 and 4 are formed in the same level, and various facilities such as conveyors 12, air-conditioning equipments, disks, pipings, ducts, wirings, etc., are incorporated into at least the high beam-framing trusses 2. At least parts of the low beam-framing trusses 4 are formed in Vierendeel trusses 4a and various facilities are incorporated into at least the parts of the trusses 4. Accordingly, since stepped sections 6 are formed by themselves at the adjacent sections of the high roof surfaces 3 and the low roof surfaces 5, opening sections 10 for daylighting and ventilation are formed at the stepped sections 6.