Lightweight Roof Framing

Notch a birdsmouth where it sits on the low wall and extend it past the wall for the eaves.

Lightweight roof framing.

Then support the mocked up truss at this height to see how the porch overhang meets the roof. Systems incorporating lightweight steel framing lsf members for low rise commercial and medium and high rise residential applications. Some of these can support the roof and prevent ridge sagging and wall spreading. A lean to roof just means it s attached to an existing structure.

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. Purlins traditionally support the roof deck cladding sheeting and are in turn supported by the principal rafters steel beams etc. The high cost of wood now means that lightweight steel roof frames are cheaper than wood. Lightweight framing materials have good compressive strength but are strongest in tension.

The rise or height of the roof at its peak is the altitude of the triangle. Lean to shed roof framing. Collar ties rafter ties tension beams structural ridge beams. 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.

Lightweight roof framing roof systems a traditional purlin strictly by definition is a horizontal structural member in a roof. Lightweight steel roof support structures this is all about to change. The lower end is done the same way a skillion or shed roof is. These lightweight steel frames are built using all the design principles that have resulted from the development of roof trusses.

Roof systems limtied showroom corner of carlos wrightson road woodbrook port of spain trinidad and tobago. A general description of lightweight steel framing. The high end of the rafter sits on or attaches to a ledger plate attached to the existing wall. The run or half the building span is the base of the triangle.

Figure out where the top of the wall plate would be if you built the porch according to our plans figures a h. 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. The framing of a basic gable roof is based on a right angle triangle and the various roof framing components fit the triangle. Lightweight steel framing is resistant to rodents and ver min such as termites.