ABSTRACT
For the co-ordinating size, which includes the width of one mortar joint, add 10 mm, i.e.
225 112.5 75 mm
Metric modular sizes:
190 90 65 mm
Other less available brick sizes:
215 102.5 50 mm 215 102.5 73 mm 215 102.5 80 mm
kg/m3
Blue 2405 Engineering 2165 Sand cement 2085 Fire brick 1890 London stock 1845 Sand lime 1845 Flettons 1795 Red facings 1765 Diatomaceous 480
Compressive strengths and percentage water absorption
Brick N/mm2 water absorption % by mass
Engineering Class A > 70 < 4.5 Engineering Class B > 50 < 7.0 Flettons 14 – 25 15 – 25 London stocks 3 – 18 20 – 40 Hand moulded facings 7 – 60 10 – 30
Frost resistance and soluble-salt content of bricks
Designation Frost resistance Soluble-salt content
FL frost resistant low salt content
FN frost resistant normal salt content
ML moderate frost resistance low salt content
MN moderate frost resistance normal salt content
OL not frost resistant low salt content
ON not frost resistant normal salt content
Spacing of wall ties 65 – 90 mm leaf thickness = 450 horizontally / 450 mm vertically over 90 mm leaf thickness = 900 horizontally / 450 mm vertically
Cavity wall ties
The standard block face dimensions are: 440 215 mm and 440 140 mm, with thicknesses of 75, 90, 100, 140, 150, 190, 200 and 215 mm.
