Levelling the trench bottom

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• 6 sections of explanation, worked examples and diagrams
• 1 practice task with hints and worked answers
• A quiz that marks itself as you go
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Other lessons in this sub-strand

1. What a foundation does
2. The functional requirements of a foundation
3. What the ground is made of
4. Bearing capacity: pressure, not weight
5. Settlement and differential settlement
6. The strip foundation
7. The pad foundation
8. The raft foundation
9. Sketching shallow foundations
10. Choosing the foundation type
11. Reading a foundation plan
12. Datum, levels and the building line
13. Setting out a right angle
14. Profile boards and lines
15. Setting out a building, step by step
16. Checking squareness with the diagonals
17. Excavating the trench
18. Trench safety
19. Water in the trench
20. Levelling the trench bottom
21. Concrete for foundations
22. Placing and compacting the concrete
23. Curing the concrete
24. Foundation defects and their causes
25. The whole foundation process