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Estimation for Building Works | Centre Line Method | Long and Short Wall Method
- The article discusses three methods for estimating quantities of various items like excavation, foundation concrete, and brickwork in the superstructure in a building.
- The center line method involves calculating the total center line length of walls in a building and multiplying it with breadth and depth for estimating the total quantity.
- The long and short wall method considers longer walls as long walls and shorter or partition walls as short walls and measures both from out-to-out and in-to-in, respectively.
- The crossing method estimates the overall perimeter of the building and subtracts four times the wall thickness to calculate the center-line length.
- The center line method is suitable for walls of similar cross-sections while the long and short wall method is suitable for walls with different height and length.
- For unsymmetrical walls, the center-line length in the center-line method varies at every layer. However, it’s the most accurate method.
- The length of long walls decreases from earthwork to brickwork, while the length of short walls increases.
- In the long and short method, the length of the longwalls out-to-out and short walls in-to-in vary in every layer of footing, and the center to center length of each wall type must be calculated separately.
- The short wall long wall method is a simpler method of estimating the quantity of work items by considering the center to center length of long and short walls.
- To estimate a circular, hexagonal, or octagonal shaped building, the center line method should specially be adopted.
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