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Standard Size of Brick  Dimension, Tolerance and Area of Bricks Based on Different Standards
What is a brick ?
Brick is a commonly used building material which is
manufactured from burnt clay. It is mostly consisted of clay, sand, lime and
bearing soil or other concrete materials.
A. Dimensions of Brick According to Different Standard Codes
Brick dimensions is one of the most crucial parameters
that need to be considered during the selection of bricks in order to ensure
they fit with the design layout. Brick selection is decided based on the
certain application in which the brick is used. Due to the fact that bricks are
used in various constructions, different brick sizes are needed. All the same
only bricks of one standard size shall be used in one work unless specially
permitted by the Client / Consultant.
Brick Image 
There are many standards each of which
established by a country that provide standard sizes for bricks for example
ASTM (American Standard for Testing Materials), BS (British Standard), CSA
(Canadian Standards Association), and IS (Indian Standard). Good quality bricks
shall have uniform size. The size of the conventional bricks shall be
225 × 110 × 75 mm³.
Cause of changes in standard brick size:
Commonly, manufacturing process and
variations in raw materials due to shrinkage of the clay during drying and
firing, wear of the mold or extrusion die, or undue stress on the units during
handling prior to firing are the root cause of changes in standard brick size.
Bricks Size as per ASTM International
The size of the conventional bricks dimension
used in the United States is 203 × 92 × 57 mm³. The more commonly used is the
modular brick, which dimension is 194 × 92 × 57 mm³ (length x depth x height).
However, the ASTM International Standards
such as ASTM C62 (Standard Specification for Building Brick ‘Solid Masonry
Units Made From Clay or Shale’), ASTM C216 (Standard Specification for Facing
Brick ‘Solid Masonry Units Made from Clay or Shale’), ASTM C652 (Standard
Specification for Hollow Brick ‘Hollow Masonry Units Made From Clay or Shale’),
and ASTM C1088 (Standard Specification for Thin Veneer Brick Units
Made From Clay or Shale) have all emphasized that the size of bricks shall be
specified by the purchaser.
Tolerable variations in the specified brick
sizes are set by ASTM International Standards. The following tolerances are
permitted in the standard conventional size adopted on the particular work.
 Length +3.0 mm/–3.0 mm
 Breadth +1.5 mm/–1.5 mm
 Depth +1.5 mm/–1.5 mm
The maximum permissible variation in
dimensions of individual units shall not exceed those given in Table1 and
Table2 provides different size variations for hollow bricks.
Table–1. Variations of dimensions of solid bricks
Specified dimension, mm

Maximum Permissible Variations from Specified Dimension,
+ or , mm

Up to 76, inclusive

2.4

Over 76 to 102, inclusive

3.2

Over 102 to 152, inclusive

4.8

Over 152 to 203, inclusive

6.4

Over 203 to 305, inclusive

7.9

Over 305 to 406, inclusive

9.5

Table–2. Hollow Brick Minimum Thickness of Face Shells and
Webs
Nominal Width of Units, mm

Face Shell
Thicknesses, mm

Face Shell
Thicknesses, mm

End Shells or End Webs

_

solid

Cored or Double Shell


76 and 101

19.05



19.05

152

25.4

38

25.4

203

32

38

25.4

254

35

41

29.5

306

38

50

29.5

Permitted size variation is based on the brick
classification and the relative dimensional range measured. Size variation
becomes important when vertical alignment of brick (stack bond) is used, when
bands of brick from different production runs are combined, or when a short
horizontal extent of brickwork is constructed, such as between closely spaced
window openings.
Bricks Size as per Canadian Standard Associations (CSA)
Similar to ASTM international, Canadian Standard
Association CSA A82, does not stipulate specific brick sizes. However, it has
established permissible variations in brick size which should not be violated.
The maximum permissible variations from specified dimension is similar as
Table1.
Bricks Size as per Indian Standard (IS 1077)
Brick sizes based on IS 1077 specification (Common burnt
clay building bricks)
The standard modular size of common building bricks shall
be as follows:
A.) The standard modular size
of common building bricks shall be as follows:
Length (L)

Depth/Width
(D/W)

Height
(H)

mm

mm

mm

190

90

90

190

90

40

B.) The
nonmodular size of bricks shall be as follows:
Length (L)

Depth/Width
(D/W)

Height
(H)

mm

mm

mm

230

110

70

230

110

30

C.) Additionally,
for obtaining proper bond arrangement and modular dimensions for the brick
work, with the nonmodular sizes, the sizes of bricks may be as follows:
Length (L)

Depth/Width
(D/W)

Height
(H)

mm

mm

mm

70

110

70^{1}/_{3}

Table3. Tolerable
Variations of Dimensions of Brick
Specified Dimension

Maximum
Permissible Variation

Over 50 mm and up to 75 mm

±1.5 mm

Over 75 mm and up to 100 mm

±3.0 mm

Over 100 mm and up to 150 mm

±5.0 mm

Over 150 mm and up to 250 mm

±6.0 mm

Tolerances in Brick Dimensions :
For modular size
Dimensions

Size (IS)

Maximum

Minimum

Length

190

190+4

1904

Width/Depth

90

90+3

903

Height

90

90+3

903

For
nonmodular size
Dimensions

Size (IS)

Maximum

Minimum

Length

230

230+4

2304

Width/Depth

110

110+3

1103

Height

70

70+3

703

Bricks Size as per British Standard
The standard dimension of a modern brick as per British
Standard BS shall be as follows:
Length (L)

Depth/Width (D/W)

Height
(H)

mm

mm

mm

215

102.5

65_{}

Bricks Size as per Australian Standard
The
standard brick size based on Australian Standard AS 4455 shall be as follows::
Length (L)

Depth/Width (D/W)

Height
(H)

mm

mm

mm

230

110

76

290

90

50

Area of Brick According to Different Standard Codes :
To calculate area of a brick or bricks you will have to find the
Dimension of the Brick (Check here: Dimension of Bricks).
 First of all, take twenty no. (20) of test specimen.
 Lay the twenty No. of brick contact with each other in longitudinal direction to measure the length of the test piece.
 Lay the twenty No. of brick in width wise direction and measure the width.
 Lay the twenty No. of brick in height wise direction and measure the thickness.
 Calculate the individual and average of the measures.
Now
you have the length (L), width/depth (W/D) and height (H) of each brick.
Every
brick is a cuboid so its area is derived from the following formula.
Area of a brick = 2(LW+WH+HL),
where L is the Length, W is the Width/Depth and H is the Height.
This
formula is sufficient for all different type Standards.
For example,
Area of modular size Brick as per IS
(190 × 90 × 90) in mm²
=2(190 × 90 + 90 × 90 + 90 × 190) mm²
=2(17100 + 8100 +17100) mm²
=2 × 42300 mm²
=84600 mm²
Note – If the Brick has each 12 sides (6+6)
of different length. Then it is difficult to find the area of the brick but not
impossible.
 Take 10 bricks and measure different length of sides.
 Combine theme as well as described above (1. To 5.) with respect to the side of equal length, then measure it’s all 12 (6+6) sides individually and find average of measures.
 Now calculate the mean of length of all 12 sides individually.
 A brick has 6 faces. After calculating the area of each faces, you find the total area of the brick which is equal to the sum of area of all 6 faces.
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