The development of the construction industry, especially building construction, required a measure system as a basis for planning and execution. The standard building dimension is the theoretical planning basis for the nominal dimensions from practice. The standard building dimension is regulated in DIN 4172 "Measures in building construction".
The building standard is the coordination measure for the planning and consequently provides the basic grid for the planning. The basis for this is provided by the octametric system commonly used in masonry construction, in which an eighth metre ("okta" - Greek, means: eight) forms the basic module of 12.5cm.
In planning, the building standard defines the grid and is always a multiple of 12.5cm or 25.0cm.
Sketch: Grid building guideline dimension, here :25cm - baukobox
Derived from this, the nominal dimension corresponds to the actual stone dimensions, i.e. the shell dimensions. The 25.0cm from the building guideline was therefore made up of 24.0cm for the stone plus 1.0cm for the joint.
Sketch: Grid nominal dimension - baukobox
Basically, the following nominal dimensions are distinguished: external dimension "A", opening dimension "Ö" and projection dimension "V":
Image: Nominal dimensions - bauwion
The height of a wall layer results from the brick height and the bearing joint thickness, which together must correspond to the standard building dimensions. They must therefore add up to a multiple of 12.5cm or 25.0cm.
Table: Overview of required layers (for masonry height 1.00m) when using different brick formats - baukobox
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