BRICKS
AND BLOCKS
Metric bricks are a little smaller than the old imperial one.
New bricks can be bonded into old brickwork by slightly increasing the mortar bed
joint.
There are a variety of sizes available and
they differ from country to country. Brick sizes have remained fairly
constant over the years although, in the UK, the depth used to be
less (about 2 ins/51mm) whereas modern bricks are about 2.5 ins./64mm.
American bricks are about 8 × 4 ×
2.25 inches (203 × 102 × 57 mm); South African 8.75 x 4 x 3
inches (222 x 106 x 73mm) and in Australia they are 9 x 4.33 x 3
inches (230 x 110 x 76mm).
Comparisons of metric and imperial bricks are as follows:-
| |
Length
of brick (excluding joint) |
Width
of brick (excluding joint) |
Height
of brick (excluding joint) |
Typical
Joint |
|
Metric |
215mm
|
102.5mm
|
50mm
|
10mm |
|
Metric |
215mm
|
102.5mm
|
65mm
|
10mm
|
|
Imperial |
225mm
|
107.5mm
|
67/68 mm
|
10mm
|
|
Imperial |
230mm
|
110mm
|
70mm
|
10mm
|
|
Imperial |
230mm
|
110mm
|
73mm
|
10mm
|
|
Imperial |
230mm
|
110mm
|
76mm
|
10mm
|
|
Imperial |
230mm
|
110mm
|
80mm
|
10mm
|
|
|
Length
(including joint) |
Width
(including joint) |
Height
(including joint) |
Typical
joint |
|
Metric |
225 mm
8.86 ins |
112.5 mm
4.43 ins |
75 mm
2.95 ins |
10 mm
0.39 ins |
|
Imperial |
9 ins.
228.6mm |
4 1/2 ins
114.3 mm |
3 ins.
76.2 mm |
3/8 in.
9.55 mm |
| |
|
|
|
|
BRICK QUANTITIES
|
AREA |
QUANTITY |
MORTAR |
| 1 Sq. Metre |
60 bricks |
0.02 cubic metres |
| 2 Sq. Metres |
120 bricks |
0.05 cubic metres |
| 5 Sq. Metres |
300 bricks |
0.12 cubic metres |
| 10 Sq. Metres |
600 bricks |
0.24 cubic metres |
Building blocks in a size
which co-ordinates with bricks are also available. These blocks are equivalent to
two brick lengths and three brick heights (i.e. a total of six bricks).
BLOCK QUANTITIES
Area |
Quantity |
Mortar |
| 1 Sq. Metre |
10 blocks |
0.01 cubic metres |
| 2 Sq. Metres |
21 blocks |
0.02 cubic metres |
| 5 Sq. Metres |
53 blocks |
0.05 cubic metres |
| 10 Sq. Metres |
106 blocks |
0.10 cubic metres |
MORTAR and CONCRETE
1 kg. of dry mortar mix (i.e.1
part cement to 5 parts dry building sand) when mixed with water will lay approximately one brick.
Doug Reay
It is
recommended that for brickwork below ground level the ratio should be
reduced to 1 part cement to 4 parts soft dry builders' sand.
2240 Kgs. all-in-ballast will make approximately
1 cubic metre concrete.
How to remove
and replace bricks.
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