Lapping reinforcement in concrete

All forms of steel reinforcement must be lapped in accordance with AS 2870 requirements. The overlaps should be held together with tie wire.
Trench mesh laps; Where trench maps are joined end to end, they need to be overlapped by at least 500 mm. Where they overlap at T or L intersections the overlap should be the width of the trench mesh

Reinforcing bar lap; Reinforcing bar laps need to be overlapped by at least 500 mm

Square mesh lap; Square mesh lap has to be overlapped by at least 225 mm