Traditional Roof Structures

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Traditional roof structures are prevailing from long ago where the structures had a shelter. Roof structure is the most aesthetic thing from the past. In the world wide there are a lot of roof structures with difference forms and difference shapes. We can divided roof structures into own qualities of countries tradition. It can be explain with own traditional qualities of each countries. As an example we can get Dutch roof, British roof and Spanish roof structures. In Dutch roof structures there are difference shape because of climate condition. Dutch roof are normal gable roof but in tropical countries they have some update with solar geometrical. An also we can divided into the cultural and climate responds. In the North Pole and South Pole …show more content…

Because of these types prevailing from traditional structures from past. And modern types of roof moderated and developed from those types.

2.2.1 Single roof
Rafters of single roof they won’t any intermediate support. Those type of roof has a limitation. Because of it can only use for small spans. If large spans are need then it should have to large roof section. If the bottom of the rafters are not tied of not in great bond then this type of roof will have a tendency, underweight, to push the supporting walls outwards at the top causing structural failure of the walls. Then single roof can be divided into the three categorised of structural strength from additional support. They are,
• Couple roof
• Collar roof
• Close couple roof

2.2.1.1 Couple roof
This type also rare type in it use. The bottom of common rafters fixed at the ridge and at the wall plate. When subjected to any type of load or force acting vertically downwards the rafters will move outwards at their feet thus exerting thrust to the wall forcing them outwards and causing possible failure of the wall structure. Because of that wall had to tendency or failure of the wall. Then single roof have to update to prevent that cause so it joined additional support to common …show more content…

Because of that common rafters get another membered support.
2.2.1.2 Collar roof
A collar roof have a horizontal roof member positioned approximately one third of the distance from the ridge to the wall plate line. This extra member support prevent the rafters from spreading under load. This type of roof structures have better roof span than couple roof. And also this type of roof structure can get greater ceiling height from use of member support.

2.2.1.3 Close couple roof
This roof incorporates main tie which is secured to the feet of each rafter and spans the width of the building. This added member forms a triangle which introduces the triangulation of forces within the structure. To stop the ceiling joist from sagging, a hanger is fixed to the top and the ceiling joist at the bottom. To increase the strength of this structure, a binder is fixed to each ceiling joist and hanger. This binder runs parallel with the main wall and at right angles to the ceiling joist. This type of structure ensures that this type of roof can be used for great spans without the fear of the roof spreading under

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