How to use center line method to estimate the quantities of various building items

In this construction video tutorial, Sami Ullah, the renowned civil engineer will provide some useful guidance on center line method to find out the quantity for foundation.

Center line method is used to compute the quantities of various items in a building like earth work in excavation, concrete in foundation, brick work in foundation and plinth, brick work in super-structure, etc. This method is mostly recognized as it provides perfect and quick estimates. This method is especially effective for calculating the circular, hexagonal, octagonal, etc. shaped buildings.

This method is useful for walls with equivalent cross sections. In order to obtain the total quantity instantly, the total centre line length is multiplied with breadth and depth of relevant item. When cross walls or partitions or verandah walls are attached with main wall, the length of the centre line decreases by half of breadth for each junction. Such junction or joints are analyzed cautiously at the time of estimating total centre line length.

In this video, Mr. Sami shows the earthwork in excavation, concrete in foundation, brickwork in foundation as well as step 1 and step 2 for the two rooms with the following dimensions :-

Length of the each room = 3.5 meter and 4 meter

The thickness of all the walls is 0.30 meter or 30 cm

To learn the complete process, watch the following video.

Video Source: Civil Engineers