Category: 1. Roof

It can be used for distances of 9-14 meters. It differs from a king post truss in having two vertical members called queen posts. The ends of the queen posts are separated by a horizontal member called a straining beam. Queen post heads are widened to receive the principal rafters and straining beams. The upper…

For spans greater than 4.8 m, when no intermediate supporting walls are available for purlins, framed structures called trusses are used. Spacing between trusses is guided by roof loads, truss material, spans and location of cross walls In a king post truss, the central vertical post called as king post provides a support for the…

It is used when the roof span is more than 5.5 meters. It is a combination of collar beam roof and close coupled roof. The rafters are supported by purlins and the purlins rest on the ends of the walls. Collars and struts are used to support purlins and rafters. Its use is recommended when…

It is used for spans between 4 and 5.5 meters. A collar of the same width as the rafters is placed on each pair of rafters and is attached at a height of one-half to one-third of the vertical height between the wall and the ridge. The collar is dovetailed to the rafters and bolts…

This type is similar to a gable roof except that the legs of the common rafters are connected by horizontal ties called tie beams. This tie-beam is attached to the foot of the common rafters to check their tendency to spread outwards and hence avoid the danger of overturning of the walls. Tie tension can…

In this type of roof, each pair or pair of joint rafters is made to slope upward from opposite walls and is supported at the upper ends by a mid-ridge piece or ridge board. The lower ends of ordinary rafters are connected to wall plates embedded in the masonry of the upper part of the…

It is the simplest type of pitched roof and has rafters that slope in only one direction. Generally, it is used to cover the verandah of the building and projects from the main wall of the building. At the upper ends the rafters are nailed to the wooden wall plates, which are placed on the…

Hip roof: This roof slopes in four directions such that the intersection of the slopes forms an inclined triangle.Gambrel roof: This roof like a gable roof slopes in two directions but there is a break in the slope on each side.Mansard roof: Like the hip roof, this roof also slopes in four directions but there…

The roof is the topmost part of the building whose main function is to enclose the space and protect it from the effects of weather elements like rain, wind, sun, heat and snow. A good roof is as important as a secure foundation. Just as a well-designed foundation protects a building from damage that starts…