Lightweight Roof Framing

The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle.

Lightweight roof framing.

The lower end is done the same way a skillion or shed roof is. The high cost of wood now means that lightweight steel roof frames are cheaper than wood. Engineered timber and steel structural design solutions exploit these characteristics to maximise structural capacity whilst minimising materials use as shown in the design of i beam structural members roof trusses and open web joists. The high end of the rafter sits on or attaches to a ledger plate attached to the existing wall.

Notch a birdsmouth where it sits on the low wall and extend it past the wall for the eaves. Then support the mocked up truss at this height to see how the porch overhang meets the roof. The run or half the building span is the base of the triangle. A lean to roof just means it s attached to an existing structure.

Considering the many uses and benefits of steel studs it is not surpris ing that the number of applications of lightweight steel framing grows daily. It is the logical complement to the lightweight steel framing design manual published in 1991 by the cssbi as a design guide for structural engineers. Lean to shed roof framing. Systems incorporating lightweight steel framing lsf members for low rise commercial and medium and high rise residential applications.

Purlins traditionally support the roof deck cladding sheeting and are in turn supported by the principal rafters steel beams etc. The rise or height of the roof at its peak is the altitude of the triangle. Lightweight steel framing is resistant to rodents and ver min such as termites. Lightweight roof framing roof systems a traditional purlin strictly by definition is a horizontal structural member in a roof.

Roof systems limtied showroom corner of carlos wrightson road woodbrook port of spain trinidad and tobago. This article describes and illustrates the different types of support that prevents roof sagging and wall bulging at buildings including definitions of collar ties rafter ties and structural ridge beams. Lightweight framing materials have good compressive strength but are strongest in tension. These lightweight steel frames are built using all the design principles that have resulted from the development of roof trusses.

Lightweight steel roof support structures this is all about to change. Some of these can support the roof and prevent ridge sagging and wall spreading. A general description of lightweight steel framing. And the line length measurement from the roof peak to the building wall is the hypotenuse.