Sub-base, Bedding, Restraints and Fixed Features
Monitor support layers, bedding, kerbs, edges, ironwork, line, level and crossfall.
How to prepare for supervisor assessment
Build the technical knowledge needed to judge work, then rehearse the supervisor evidence loop: review, observe, compare, intervene, record and verify.
Core concepts
Concept 1
Failed sub-base is corrected before bedding is used; bedding is not a substitute structural layer.
Exam cue: Inspect the sub-base after loose material is removed.
Concept 2
Bedding material, thickness, moisture and preparation support even, stable placement.
Exam cue: Prepare only bedding that can be covered without disturbance.
Concept 3
Edge restraints, kerbs and ironwork must be stable and coordinated with drainage and finished level.
Exam cue: Set fixed features against the final accessible profile.
Risk pitfalls and guardrails
Using variable bedding to hide a failed foundation.
Guardrail: Do not treat a card, checklist or previous site as proof that the current work complies; inspect the evidence and close every defect.
Leaving an unsupported cut edge.
Guardrail: Do not treat a card, checklist or previous site as proof that the current work complies; inspect the evidence and close every defect.
Setting a cover as a trip point in a footway.
Guardrail: Do not treat a card, checklist or previous site as proof that the current work complies; inspect the evidence and close every defect.
Memory anchors
Foundation Before Bedding
Correct structural defects first.
Bedding Stays Even
Control thickness and disturbance.
Edges Restrain the Surface
Restore stable boundaries.
Features Fit the Finish
Coordinate level and drainage.
Checkpoint rule
Do the check-up only after you can summarize each concept in one sentence and identify one dangerous pitfall from memory.
Knowledge Check (after reading)
Short check-up to confirm understanding of this module.
Check-up Questions
Next step personalized recommendations
Continue learning
Move forward only after this module is stable.
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