QS First lesson

METHODS OF TAKING OUT QUANTITIES

The quantities like earth work, foundation concrete, brickwork in plinth and super
structure etc., can be workout by any of following Three  methods but mostly use first two method:

A) Long wall - short wall method
B) Centre line method.
C) Partly centre line and short wall method

A) LONG WALL-SHORT WALL METHOD

In this method, the wall along the length of room is considered to be long wall while
the wall perpendicular to long wall is said to be short wall. To get the length of long wall or
short wall, calculate first the centre line lengths of individual walls. Then the length of
long wall, (out to out) may be calculated after adding half breadth at each end to its
centre line length. Thus the length of short wall Measured into in and may be found by
deducting half breadth from its centre line length at each end. The length of long wall usually
decreases from earth work to brick work in super structure while the short wall increases. These
lengths are multiplied by breadth and depth to get quantities.

last to methods definition in end Page of this page...

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Example: - Workout The following quantities from the given data and sketch for a straight wall 20’ long.

 Earth work

     Concrete work

  Brick work in foundation and plinth

   Damp proof course

    Brick work in super Structure

   Cement plaster

White washing  

Solution:-

S, NO	Description			No	Length m	Breath m	Height/ Depth m	Quantity cft	Remarks
1	Excavation			1	21’-9”	2’-6”	2’-0	108.750	Length of long wall +(Breath of step – Step of Sp structure wall)=21’-9”
2	Concrete (1:3:6)			1	21’-9”	2’-6”	9”	40.78
	Brick Works in Foundation and Plinth
	A B C	First Step 2nd step 3rd step		1 1 1	20’-9” 20’-4.5” 20’-0”	1’-6” 1’-1.5” 0’-9”	0’-6” 0’-6” 0’-9”	15.56 11.46 11.25
4	D.P.C (1:2:4) Thickness 1.5”			1	20’-0”	0’-9”	__	15 sft
5	Brick works in Sup. Str. Mortar (1:2)			1	20’-0”	0’-9”	10’-0”	150
6	Cement plaster 1” thickness (1:3)			2 2 1	20’-0” ___ 20’-0”	___ 0’-9” 0’-9”	10’-6” 10’-6” __	420 sft 15.75 stf 15.00 stf
	A B C		Sp. Wall Sides top
	Total Cement plaster							450.75 stf
7 White washing 3 coasts				As per Item No : 6				450.75 sft

     

B) CENTRE LINE METHOD

This method is suitable for walls of similar cross sections. Here the total centre line

length is multiplied by breadth and depth of respective item to get the total quantity at a time.

When cross walls or partitions or verandah walls join with main all, the centre line length gets

reduced by half of breadth for each junction.Such junction or joints are studied

carefully while calculating total centre line length. The estimates prepared by this method

are most accurate and quick.

C) PARTLY CENTRE LINE AND PARTLY CROSS WALL METHOD

This method is adopted when external (i.e., around the building) wall is of one
thickness and the internal walls having different thicknesses. In such cases,centre line method is
applied to external walls and long wall-short wall method is used to internal walls. This
method suits for different thicknesses walls and differentlevel of foundations. Because of this
reason, all Engineering departments are practicing this method.

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