This document describes the center line method for calculating quantities of materials for load-bearing structures. It explains that the center line length of walls is first calculated by adding up the lengths between wall centers. For example, a wall layout with sections of 6.3m, 6.3m, 3.3m and 3.3m would have a total center line length of 19.2m. The document also notes that junctions or intersections require subtracting half the width of the material multiplied by the number of junctions from the total center line length. An example calculation for brick wall work is provided.

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SESSION: 01 CENTRE LINE METHOD
Introduction:
1. This method is used to calculate quantity of civil work especially in load bearing
structure.
2. In this method firstly, calculate the center line length of the wall
e.g. Center line length = 6.3 + 6.3+ 3.3 + 3.3 = 19.2 m
3. Centre to centre line method is quick, but it requires special attention and
consideration at the junctions or meeting points of partition or cross walls, etc.
e.g. Total length = c/c length – ½ x No’s of junction x width of item
Wall thick-0.3 m
Wall height-3.1m
6 m x 3 m
Example:
Measurement sheet:
Sr.no.
Work
description
Unit No’s Length Width Height/Depth Quantity Total
Quantity
1.0 Brick work
TL= c/c dist – ½
no of J x w
= 19.2 – ½ * 0 X 0.3
= 19.2 meter
M3 1 19.2 0.3 3.1 17.856
17.856
6.3 m
6.3 m
3.3m
m
3.3m