One Way Roof Design

Roof shapes differ greatly from region to region.

One way roof design.

Roof type chart 1. Design a one way slab for the inside of a building using the span loads and other data given in figure 1. If both walls are the same height you can either raise one by adding plates to it or you can build a frame for the wall separately and then install this on top of the wall. The main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering.

It also is often used on dormers extensions built on a basic roof to provide more light or space inside. When a slab is supported on all four sides and the ratio of long span to short span is equal or greater than two it will be considered as one way slab. One way is to design the roof to have a parapet wall covering the roof edge. Another is to create a custom gravel stop drip edge flashing piece that changes profile along the length of the roof to compensate for the change in pitch.

A roof that slopes in only one direction is called a shed or pent style. The a frame is very easy to identify. Usages vary slightly from region to region or from one builder or architect to another. The shorter span of one way slab is provided with the main reinforcement while the longer span is provided with the distribution reinforcement.

Normal weight aggregate concrete is specified with a density of 145 pcf. It is a common roof on sheds and other outbuildings and is frequently used on carports patios porches and small additions to a house. The bonnet roof is identified with the extending ledge around the base of the roof. Assuming cover 3 4 in figure 1 the minimum thickness for one way slab simply supported l 20 using table 1 aci 9 5 2 1.

Roof terminology is also not rigidly defined. A slanted shed roof can easily be built if one of the walls of the shed stands taller than the opposite one. Some of the prominent examples of the one way slabs are the cantilever slabs chajjas and verandahs. However main reinforcement bar and distribution bar in transverse direction.

Once your walls are uneven you can build a slanted roof to fit. Significantly cheaper to build than a gable or multi slope roof since there s less material in the roof. The butterfly roof is an. The load on the slab is carried by the short span in one direction.

Longer span l shorter span b 2. It s steep pointed roof which extends all the way to the ground.