Mode of Measurement of brick work is 1200:1976 Part-3 Cpwd Specifications Complete Guide

 

Introduction
Brick work is one of the most basic and important activities in building constructions. From residential houses to commercial and high rise building. Brick work is a  very common item in building constructions. I have explained very important interview questions for billing engineers, site engineers and quantity surveyors.
This article clearly explains Brick work in very simple language, suitable for Site Engineer , Billing Engineer, While strictly Following CPWD Specifications brick work.
It is specially useful Billing engineer, site Engineer.

What is Brick work ?

Brickwork is the constructions of wall by laying bricks in a proper pattern using cement mortar with proper line, level and bonding as per drawing and  follow the CPWD specifications guideline.

Brick + Mortar = Brickwork

Types of Brick Bonds

1. English Bond
Alternate courses of stretchers and Headers Use in 230MM thick wall, very strong used for load-bearing walls.
2. Flemish Bond
Each course has one stretcher + one header alternately
3. Stretcher Bond
All brick laid lengthwise joint staggered
4. Header bond
All brick laid headers, used for Soak Pit , Rain water Harvesting Pit, Curved wall.
5. Stack Bond
brick placed directly one above another vertical joints aligned.
6. Garden wall Bond
Usually 3 stretchers + 1 header pattern, used  for boundary wall.
7. Herringbone Bond
Brick laid in zig-zag pattern, used in flooring and paving work.
8. Honey Comb brick bond
Forming a pattern that looks like a honeycomb brick work   

Basic rules of brick work item specification in BOQ

Below Ground Brick work in foundation level measure in cubic meter generally use 230MM thick wall Ratio Is ( 1 :6 )
above Ground Brick work in Super structure  measure in cubic meter generally use 230MM thick wall Ratio Is ( 1 :6 ) Both brick work are measure separately otherwise specified in BOQ.
Half Brick work single layer 115 thick wall Ratio Is ( 1 :4 )  measure in square meter separately otherwise specified in BOQ.
Half brick work use in partition , toilet wall providing every 3^rd layer brick  6MM to not exceed 8MM dia  2nos M.S bar.
Over laps in reinforcement, if any shall not be less than 300MM

Dimensions and Tolerances of bricks

DIMENSIONS AND TOLERANCES OF BRICK
Is 1077 clause 6.1 Dimensions
Clause 6.1.1  The standard modular size of common building bricks shall be as follows.
Sr. no.	Types of brick	Length MM	Width MM	Height MM
1	Modular Brick	190 MM	90 MM	90 MM
2	Modular Brick (Tile)	190 MM	90 MM	40 MM
Clause 6.1.2  The standard Non-modular size of common building bricks shall be as follows.
Sr. no.	Types of brick	Length MM	Width MM	Height MM
1	Non-Modular Brick	230 MM	110 MM	70 MM
2	Non-Modular Brick (Tile)	230 MM	110 MM	30 MM
CPWD Clause 6.1.5.2  Individual tolerance of bricks shall be as follows.
1	Modular Brick	190 + -  7MM	90 + - 4 MM	90 + - 4 MM
2	Non-Modular Brick	230 + - 10MM	110 + - 7MM	70 + - 4 MM

 

Classifications of brick

Cpwd specifications clause 6.1.2 Table 6.2
Brick are classified based on compressive strength, that is how much load they can carry, low strength for light work, Medium for normal buildings, and high strength for heavy structures.
Minimum compressive strength as given below .

CLASSIFICATION OF BRICKS
Cpwd specifications clause 6.1.1 Table 6.2
Average compressive strength of brick in (N/mm²)
Sr. no.	Class Designation	Not Less Than (N/mm²)	Less Than (N/mm²)
1	12.5	12.5 N/mm²	15 N/mm²
2	10	10 N/mm²	12.5 N/mm²
3	7.5	7.5 N/mm²	10 N/mm²
4	5	5 N/mm²	7.5 N/mm²
5	3.5	3.5 N/mm²	5 N/mm²

1.      Consumption of cement and brick

Description of Item	Number of brick	Cement quantity	Remark & Description of work
BRICK WORK MASONRY
Modular bricks Ratio ( 1:4  )	486 Nos Brick in 1 Cum	83.6 kg cement in 1 cum	380 kG cement in 1 Cum Motors for 9 inches brick work 0.22 Cum motors use in one cum brick brick
Modular bricks Ratio ( 1:6  )	486 Nos Brick in 1 Cum	55 kg cement in 1 cum	250 kG cement in 1 Cum Motors for 9 inches brick work 0.22 Cum motors use in one cum brick brick
Non modular brick Ratio ( 1:4 )	494 Nos Brick in 1 Cum	95 kg cement in 1 cum	380 kG cement in 1 Cum Motors for 9 inches brick work 0.25 Cum motors use in one cum brick brick
Non modular brick Ratio ( 1:6 )	494 Nos Brick in 1 Cum	62.5 kg cement in cum	250 kG cement in 1 Cum Motors for 9 inches brick work 0.25 Cum motors use in one cum brick brick
HALF BRICK MASONRY
Half brick masonry Ratio ( 1:3 )	56.5 Nos Brick in 1 Sqmr	14.28 kg cement in 1 Sqmr	1428 kG cement in 100 SQMR Motors for 4 inches brick work 14.28KG motors use in 100 SQMR brick brick
Half brick masonry Ratio ( 1:4 )	56.5 Nos Brick in 1 Sqmr	10.64 kg cement 1 Smqr	1068 kG cement in 100 SQMR Motors for 4 inches brick work 10.64KG motors use in 1 SQMR brick brick

Measurement book with Example
Brick work Deduction rules

	PROJECT NAME		Sun Tower Greater Noida
	CLIENT NAME		Onsite XL
	CONTRACTOR NAME		SANGEETA DEVI
	RUNNING BILL No.		RA-01
MEASUREMENT  BOOK
S.No.	Description	Unit	No.	No.	L	B	H	Qty.	Remarks
	EXAMPLE -1
	Plain Wall
	Wall	cum	1	1	5	0.23	3	3.45
	Final quantity								3.45 cum
	EXAMPLE -2
	Wall with small opening upto 0.01 cum
	Wall	cum	1	1	4	0.23	3	2.76
	Beam in wall	cum	1	1	0.2	0.23	0.15		0.0069
	No Deduction
	Final quantity								2.76 cum
	EXAMPLE -3
	Wall with opening above 0.01 cum
	Wall	cum	1	1	6	0.23	3	4.14
	Exhaust fan	cum	-1	1	0.3	0.23	0.3	-0.02
	Deduction above 0.01 cum area
	Wall	cum	1	1	3	0.23	3	2.07	Height 1.5 +.23 M = 1.73M
	Window 1.5 M  X 1.5M	cum	-1	1	1.5	0.23	1.73	-0.60
	Deduction above 0.01 cum including lintel depth
	Final quantity								5.59 cum
					Total quantity			11.80
					Previous			0.00
					This Bill			11.80