They are identified by their depth i e.
Brick and block wall thickness.
Most of the time in housing we have an outer skin or wythe in american half brick wall laid in stretcher bond which would be 102 5mm thick which is the width of the brick.
Concrete block cmu sizes concrete masonry units cmus are manufactured in a variety of sizes.
For brick walls a common thickness is 230mm 9 and for concrete block walls common thicknesses are 200mm 8 150mm 6 and 100mm 4.
On the other hand solid masonry brick walls contain two or more layers of thickness attached during the masonry process and held together with metal ties or header bricks.
The thickness of the wall they create.
See more on the regulationsusing a traditional cavity wall you will probably end up with something like the following.
Blockwork and brickwork dimensions work size represents dimensions of a typical block brick used in blockwork brickwork in europe.
112m m outer skin of brick or 200 of stone 50 mm cavity 75mm of insulation 100mm insulating breeze block inner wall 25 mm plaster.
For most standard bricks that would be 215mm.
For instance a 6 cmu is nominally 6 deep while a 10 cmu is nominally 10 deep.
In the building trade the thickness of the walls excludes the plaster so if a wall is plastered on both sides its actual thickness will be 1 or 1 5 more than its stated thickness in an architectural drawing or contract.