What size is a standard UK brick?
+
A standard UK metric brick is 215mm long, 102.5mm wide and 65mm high. With 10mm mortar joints, its coordinating size is 225 × 112.5 × 75mm.
What do CO, CO+ and CO- mean?
+
They are the three ways a run of whole bricks can be dimensioned. CO is brick plus one joint (n × 225mm), used for panels with opposite return ends. CO+ is brick plus two joints (n × 225mm + 10mm), used for openings. CO- is brick only (n × 225mm − 10mm), used for piers and panels between openings. For four bricks that gives CO 900mm, CO+ 910mm and CO- 890mm.
How many brick courses are there in a metre?
+
Each course of standard UK bricks is 75mm including the bed joint, so a metre is 13⅓ courses. The nearest whole-course heights are 975mm (13 courses) and 1050mm (14 courses).
How many bricks are there in a square metre?
+
About 60 for a half-brick wall in stretcher bond, since each brick and its joints cover 225 × 75mm. Add an allowance for cuts and breakages when ordering.
How do I set a sill or head height to brick courses?
+
Choose heights that are whole multiples of 75mm from a course line, such as 900mm, 975mm or 1050mm.