The way that bricks are arranged affects a veneers stability and strength and is referred to as a ‘bond’ or ‘bonding’.
RUNNING OR STRETCHER BOND
Section 9.2.2 of E2/AS1 requires that bricks are laid with a ‘running bond’ (also referred to as
‘stretcher bond’. E2/AS1 (part4).
To maintain a running or stretcher bond, bricks of each course must overlap the previous course by between 25% and 75% of the length of the bricks (NZS4210:2001 Section 1.3 Definitions).
A bond pattern should be consistent throughout the veneer.
To achieve a stretcher or runner bond and meet industry aesthetic standards, the minimum size a masonry unit should be cut to is the greater of: ¼ the length of the units or the width of the units.
The practice of brick cutting should comply with the Master Brick and Blocklayer Practice Advisory –Brick and Block cutting:
Section 9.2.3 of E2/AS1 advises that no length of veneer wall or panel can be less than 230mm.
If the wall or panel turns (usually 90°) then this is usually referred to as a return. The measurement of a return is taken as the total length of the wall rather than treating the wall as two separate panels.
An internal corner should mirror an external corner as closely as possible. To meet industry standards and avoid the appearance of an undersized cut masonry unit, the length of the masonry unit visible in an internal corner should be at least the greater of: ¼ the length of the unit or the width of the unit.