Structural Steel Roof Framing Details

Unlike structural steel shapes that are hot rolled into shape manufacturing of lightweight steel framing is carried out at ambient temperature hence the term cold formed.

Structural steel roof framing details. Purlins girts and roof deck the substructure to which the metal panels are fastened must be properly spaced and sufficiently thick to provide a roof or wall system able to meet required design loads. Because the manufacturing process is fast there. A single typical mill in one working shift can produce 20 km of straight highly uniform accurate product. Both use framing members such as dimensional lumber engineered lumber or light gauge c shaped steel members surfaced with structural sheathing typically plywood or osb.

R7 roof eave and soffit detail r8 rafter and joist bridging r9 collar tie at rafter detail r10 rafter brace connection detail r11 roof framing with wood tail extension r12 wood truss bearing on steel wall r13 collector block detail r14 non aligned roof wall framing r15 hip beam miscellaneous. Cfs light frame construction g500 11 guidelines for inspecting cfs structural framing in low rise buildings g800 12 astm standards for cfs g801 13 astm a1003 no cause for rejection g802 13 aisi section a2 2 other steels g900 15 design methodology for hole reinforcement of cfs bending members j100 11 cfs floor joists. Truss a structural frame of steel shapes connected into an assembly that can support loads far in excess of beams and girders due in large part to the depth or height of the assembly. Cad details metals 05 12 00 structural steel framing structural steel framing cad drawings free architectural cad drawings and blocks for download in dwg or pdf formats for use with autocad and other 2d and 3d design software.

Eastern seaboard the gulf coast states california and hawaii. Roof framing must be designed to hold up a structural load including what is called dead load its own weight and the weight of the roof covering and additional loading called the environmental load such as snow and wind. The first approach to achieving a strong durable struc ture involving economical use of materials is to follow a basic modular plan for layout and attachment of framing members. A truss is composed of chords main horizontal members vertical members and diagonal members.

Flat roofs may also need to be designed for live loads if people can walk on them. The strength and ductility of structural cold formed steel cfs framing along with the holding power of cfs connections make it the ideal material for construction in high wind speed and seismic zones such as the u.