Structural Steel Roof Framing Details

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.

Structural steel roof framing details. Roof pitch the metal roofing panels shown in this manual require a mini mum slope of 2 per foot to ensure proper drainage. The irc and ibc provide prescriptive framed shear wall designs that may be incorporated into the building design to resist lateral loads. Steel sheet roofs in high wind areas 20 lintels supporting masonry. Beams columns braces plate trusses and fasteners.

The trim and roofing sheet should be fastened every 12 to 24 inches along the gable edge. It does not include for example cables ladders chutes grating stairs catwalks handrails or ornamental metal. Structural steel sections refer to the onesteel product catalogue structural steel. Such methods use a 4 foot design module which governs a 16 inch spacing of joists studs rafters and panel sheathing products.

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. Structural steel the structural elements that make up the frame that are essential to supporting the design loads e g. M1 cabinet blocking detail m2 wiring and piping. Refer to the rain carrying table in this booklet for the maximum allowable panel length per.

Steel framing is a practical code approved solution to many of the limitations that builders face today when using traditional building materials. Minimum base steel thickness. 3 heights based on steel properties only calculated in accordance with csa s136 2002. 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.

4 for 365s125 members use values listed for 350s125. 2 limiting heights are based on continuous support of each flange over the full height of the stud. 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. 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.

Flat roofs may also need to be designed for live loads if people can walk on them.