Lapping – what is it?
It’s got nothing to do with being over taken on the F1 track. Lapping refers to the “overlapping” of reinforcement with another section of reinforcement.
Why do we lap?
- It gives greater structural integrity to the structure you are fabricating. What does this mean? It means that when you lap, your concrete will be stronger, and will be better able to withstand loads/weights. In other words, a lapped structure will be more sturdy that unlapped structures.
- AS 2870 requires that we lap.
Lapping Requirements?
Trench Mesh Laps
- If they are overlapping at T or L intersections, then overlap the full width of the mesh.
- When end to end, they need to be at least 500 mm.
Please see below:
Square mesh lap
- These need to be lapped by 225 mm minimally.
Very similar to the above – please refer to that diagram.
Reinforcing Bar Laps
- Lapping needs to be at minimally: 500 mm.
Please see below:
I hope this helps you. Any questions? Feel free to ask. I may even write up another post if the question is good enough.
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