One of the technical drawings of the building is shown in figure 3 below. Make sure to use the correct materials as specified. A roof … In traditionally constructed roofs, the roof may also require added support in the form of roof trusses. In modern double roof construction, the whole of the roof is constructed of lightweight roof trusses called trussed rafters (See Module 4). The roof must be appropriate for the climate in which the house is being built. and roof design. the roof truss, column support and joints are assumed to be the most crucial parts. – If the truss is already installed, shore up the truss to relieve any load. GANG-NAIL Truss System From these examples, it can be readily appreciated that timber trusses are very effective structural components. For many single storey buildings sloping roofs on trusses are common. Wood trusses are very versatile and compatible with other structural products. Figure 3 Technical drawing of truss and column assembly Draw FBD of the 2 different parts of the truss Enforce Equilibrium to find the forces in the 3 members that are cut. The top chords are straight. TERMINOLOGY LEARNING OBJECTIVE: Upon completing this section, you should be able to identify the types of roofs and define common roof framing terms. 6. • Factory-manufactured components to exact span requirements • Reduced HVAC, plumbing, and electrical subcontractor time on job • No column pads to pour, no steel beams and posts to place • Job site material pilferage and cutting waste reduced TM ADVANTAGES OF TRUSSES OVER CONVENTIONAL FRAMING Roof-Floor Truss manual 7/31/08 10:43 AM Page 5 CE297 -FA09 -Ch6 Page 9 . igure 12 russ Analysis and Member Design and a truss shape has been chosen, the truss can be s are subjected to combinations … The point at which all the rafters are attached to. Attic trusses are designed to provide living areas within the roof space. •Transfers the load of the roof through the raftersto walls below. When a roof is to be provided for a building which does not have interior supports and the exterior walls are more than 12 m apart, a roof truss will be a convenient arrangement to support the roof. Roof trusses other than these 1. girder trusses) or combined with other components, such as glulam, LVL, PSL and steel beams. Various loads acting over the truss are calculated using the provisions of IS875 (Parts … Triangular roof trusses 2. Framing of a Roof Supported Truss. Triangular Roof Trusses: These contain the most common types of trusses used for building. This technical drawing is modelled in CAD software and analysis then takes place. Parts of a Roof •A Ridge Board is a horizontal member of the roof frame. discussion of the types and parts of roof trusses. 1. In North America, wood roof The various steps involved in the design of truss members are as follows: 1. Crescent roof trusses 3. They can be connected to other trusses (i.e. The primary object of a roof in any climate is protection from the elements. 5. Depending upon the span, required lighting, and available roofing material, the type of truss is selected and a line diagram of the truss is sketched 2. Triangular roof trusses may be identified by the web bracing used and the simple triangular geometric shape used throughout their design. •Ridge Beam sits below the rafters. Truss roof framing is cov-ered in Section 17.4. A roof must be strong to withstand snow and wind loads. The main purpose of a roof is to protect the house in all types of weather with a minimum of maintenance. – Seek professional guidance if anything is unclear. Prior to beginning the repair, lay the truss flat on a solid, level surface. Common Roof Trusses 5. 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