. BONDING BLOCKWORK Principles

Despite the difference in size compared to bricks, the principles of bonding blockwork are much the same as those for brickwork. A regular bond pattern should be maintained throughout a wall’s length, ensuring a minimum overlap of a quarter of a block, although blockwork is almost always laid half-bond.

At stopped-ends, a half-block (215mm) is cut and introduced on alternate courses to maintain the bond. To establish half-bond at junctions and returns, a 105mm block bat should be built in adjacent to the return block (see Fig 102).

. BONDING BLOCKWORK Principles

Fig. 102 Blockwork corner/return with stopped-end.

An alternative method is to introduce a brick-on-end with its bedding face turned outwards, but this is very bad practice. It is unsightly on fair-faced work and, being a completely different material, will move disproportionally to the blockwork, resulting in cracking. The only viable alternative method is to make use of purpose-made quoin-return blocks, which are ‘L’-shaped on plan. This will ensure a half-bond at the corner and eliminate the need for any cutting. That said, the time saved by avoiding cutting blocks at corners will probably not justify the additional cost of such special blocks on smaller projects.

. BONDING BLOCKWORK Principles