blockwork bonding at junctions

• Concrete blocks are laid in stretcherbond and joined to other walls by block bonding or by leaving metal ties or strips projecting from suitable bed courses .
• Mortar used in blockwork should be weaker than the material of the walling unit ,generally a 1:2:9 gauged mortar mix will be suitable for work above ground level .
• Because the block units are comparatively large , any settlement movement in a wall will show more abvious cracking in mortar joints