Methods of Estimation for Building Works

Methods of Estimation for Building Works - Long Wall Short Wall

Long wall and short wall method
The estimation of building quantities like earth work, foundation concrete, brickwork in plinth and superstructure etc. can be worked out long wall short wall method and centerline method.

Long wall and short wall method = This is simple method and there are less chances of mistakes. In this method long wall and short wall are worked out separately.

Long wall length out-to out = (centre to centre length + half breadth on one side + half breadth on the other side)
Long wall length out-to out = (centre to centre length +one breadth)

Q. Calculate the quantity of the following item (shown in fig)
(a) Earthwork in excavation in foundation (b) Concrete in foundation (c) Brick work in foundation and plinth (d) Brickwork in superstructure





Ans. Calculation of quantities = No of wall × Length × Breadth × Height or Depth
 Where
       Length for Long wall = length of long wall centre to centre + Breadth
       Length for Short wall = length of short wall centre to centre - Breadth

The length of long wall centre to centre =  5m + (1/2 × .30m) + (1/2 × .30m) = 5.30m     
           Where     (30cm = .30m)
The length of short wall centre to centre = 4m + (1/2 × .30) + (1/2 × .30) = 4.30m
           Where     (30cm = .30m)                    

1. Earthwork in excavation in foundation :
          Long Wall = 2 × (5.3m + .90m) × .90m × .90m = 10.04m3
          Short Wall = 2 × (4.30m - .90m) × .90m × .90m = 5.51m3
          Total = Long wall + Short wall = 10.04m3 + 5.51m3 = 15.55m3

2. Concrete in foundation :
          Long Wall = 2 × (5.3m + .90m) × .90m × .30m = 3.35m3
         Short Wall = 2 × (4.30m - .90m) × .90m × .30m = 1.81m3
         Total = 3.35m3 + 1.81m3 = 5.81m3

3. Brick work in foundation and plinth :
 3.1.  1st Footing
         Long Wall = 2 × (5.3m + .60m) × .60m × .30m = 2.13m3
         Short Wall = 2 × (4.3m -.60m) × .60m × .30m = 1.33m3

  3.2. 2nd Footing
        Long Wall = 2 × (5.3m + .50m) × .50m × .30m = 1.74m3
       Short Wall = 2 × (4.30m - .50m) × .50m × .30m = 1.14m3

  3.3. Plinth
        Long Wall = 2 × (5.3m + .40m) × .40m × .60m = 2.74m3
        Short Wall = 2 × (4.30m - .40m) × .40m × .60m = 1.87m3
        Total = (2.13m3 + 1.33m3) + (1.74m3 + 1.14m3) + (2.74m3 + 1.87m3) = 10.95m3

4. Brickwork in superstructure :
         Long Wall = 2 × (5.3m + .30m) × .30m × .3.50m = 11.76m3
        Short Wall = 2 × (4.30m - .30m) × .30m × 3.50m = 8.40m3
        Total = 11.76m3 + 8.40m3 = 20.16m3


Solution

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