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Pitched Roofs
The document discusses pitched roofs, which slope down from a ridge and are primarily categorized by their slope angle and configuration. It details various types of pitched roofs, including single roofs (for spans less than 5m) and double or purlin roofs (for spans exceeding 5m), as well as trussed roofs for larger spans. Key components and structural considerations for supporting these roofs, such as rafters, purlins, and trusses, are also outlined.
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Pitched Roofs
- 1. 2.4. Pitched Roofs RohanDasgupta Mod. 2: Components and Services of a Building
- 2. Pitched roof isa roof that slopes downwards from a ridge (the highest point of a roof). Image courtesy: https://www.homedit.com/classic-gable-roof-style/house-of-hunting-gable-roof-arkitema-architects/
- 3. Pitched roofs mayslope downwards on one side or both sides. Image courtesy:https://www.houzz.in/photos/green-built-modern-phvw-vp~4360777 Image courtesy: https://www.homedit.com/classic-gable-roof-style/house-of-hunting-gable-roof-arkitema-architects/
- 4. Any roof havinga slope less than 10° is called as a flat roof. However, the general slope of pitched roof ranges from 1:40 to 1:80. Pitch of a roof = vertical rise / horizontal span Image courtesy: https://www.homedit.com/classic-gable-roof-style/house-of-hunting-gable-roof-arkitema-architects/ vertical rise horizontal span
- 5. External Parts ofa Pitched Roof Image courtesy: https://en.wikipedia.org/wiki/Roof#/media/File:Roof_diagram.jpg
- 6. Internal Parts ofa Pitched Roof
- 7. (a) Single roofs 1.Lean to roof (verendah roof) 2. Couple roof 3. Couple close roof 4. Collar beam roof or collar tie roof (b) Double or purlin roofs TYPES OF PITCHED ROOFS (c) Triple membered or framed or trussed roofs 1. King post roof truss 2. Queen post roof truss 3. Combination of king post and queen post truss 4. Mansard roof truss 5. Truncated roof truss 6. Bel-fast roof truss or latticed roof truss 7. Composite roof truss 8. Steel sloping roof trusses
- 8. Single Roof: If thespan of roof is less than 5 m the following types of single roofs are used: (i) Lean to roofs (ii) Coupled roofs, (iii) Coupled-close roof, (iv) Collar beam roof In all these roofs rafters placed at 600 mm to 800 mm spacing are main members taking load of the roof. Battens run over the rafters to support tiles. This is provided when wall on one side is higher than the other. This type of roof is suitable for out-houses and sheds attached to the main building.
- 10. Double or PurlinRoofs: If span exceeds, the cost of rafters increase and single roof becomes uneconomical. For spans more than 5 m double roof or purlin roofs are preferred. The intermediate support is given to rafters by purlins supported over collar beams.
- 11. Trussed Roof: If spanis more, a frame work of slender members are used to support sloping roofs. These frames are known as trusses. A number of trusses may be placed lengthwise to get wall free longer halls. Purlins are provided over the trusses which in turn support roof sheets. For spans up to 9 m wooden trusses may be used but for larger spans steel trusses are a must. In case of wooden trusses suitable carpentry joints are made to connect various members at a joint. Bolts and straps are also used. In case of steel trusses joints are made using gusset plates and by providing bolts or rivets or welding. Depending upon the span, trusses of different shapes are used. End of trusses are supported on walls or on column.
- 13. Thank you [email protected] facebook.com/rohandasgupta twitter.com/rohandasgupta - RohanDasgupta B.E. (Civil), M.E. (Structural), Ph.D. (pursuing…) Navi Mumbai, Maharashtra, India +91 9967569336