One Way Roof Design

Normal weight aggregate concrete is specified with a density of 145 pcf.

One way roof design.

A slanted shed roof can easily be built if one of the walls of the shed stands taller than the opposite one. Design a one way slab for the inside of a building using the span loads and other data given in figure 1. The other part of the. However main reinforcement bar and distribution bar in transverse direction.

It also is often used on dormers extensions built on a basic roof to provide more light or space inside. The butterfly roof is an. 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.

It s steep pointed roof which extends all the way to the ground. The intent is to create a uniform edge on the outside but a varying profile on the inside along the sloping roof. The a frame is very easy to identify. One way is to design the roof to have a parapet wall covering the roof edge.

Longer span l shorter span b 2. 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. 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 main factors which influence the shape of roofs are the climate and the materials available for roof structure and the outer covering.

The load on the slab is carried by the short span in one direction. The bonnet roof is identified with the extending ledge around the base of the roof. 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. Basically a slanted roof style is a flat roof tilted high up at one edge to create a very steep slope.

Roof terminology is also not rigidly defined. 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. Some of the prominent examples of the one way slabs are the cantilever slabs chajjas and verandahs.

Roof type chart 1. A roof that slopes in only one direction is called a shed or pent style.