TryBuildCalc

Gravel Coverage Verification Checklist

Essential Checklist+

Complete these critical checks before approving the work or proceeding to the next construction stage.

✓16 Inspection Points
✓6 Verification Categories
✓Area Measurement+
  • Dimensions were measured on site — not estimated from memory or taken from drawings.
  • Irregular or L-shaped areas were split into rectangles and each section measured separately.
✓Depth and Application+
  • Depth is appropriate for the application — decorative paths 30–50mm, driveways 50–75mm, drainage 100–150mm.
  • The depth entered is the finished (compacted) depth, not the loose depth — compaction will be applied separately.
  • Depth is entered in the correct unit — do not mix mm and cm.
  • For roof ballast, structural engineer approval for the dead load has been obtained before ordering.
✓Gravel Type and Size+
  • Gravel type is confirmed — decorative (rounded), drainage (single-size angular), driveway (self-binding or crusher run), or sub-base.
  • Drainage applications use single-size open-graded gravel — no fines, no crusher run, no self-binding gravel.
  • Self-binding gravel or crusher run is specified for driveways — loose decorative gravel displaces under vehicles.
  • Bulk density used in the calculator matches the gravel type — pea gravel ~1,500 kg/m³, MOT Type 1 ~1,900 kg/m³.
✓Compaction+
  • Compaction factor is applied for all base layers, driveway sub-base, and self-binding gravel.
  • Compaction is set to 0% for single-size drainage gravel — compacting drainage gravel destroys its drainage performance.
  • Compaction is set to 0% for loose decorative gravel and garden paths where no compaction is applied.
✓Wastage+
  • Wastage of at least 5% is added for all manually spread gravel.
  • The quantity including wastage — not the net coverage quantity — is used for ordering.
✓Before Purchase+
  • The coverage area result was cross-checked against the measured site area.
Full QC Checklist+

Use this checklist before ordering or spreading gravel to confirm the material type, measured area, intended layer depth, density, wastage, and whether the available tonnes or bags provide sufficient coverage.

✓30 Inspection Points
✓6 Verification Categories
✓Area Measurement+
  • Dimensions were measured on site — not estimated from memory or taken from drawings.
  • Irregular or L-shaped areas were split into rectangles and each section measured separately.
  • For circular driveways or paths, the radius — not the diameter — was entered.
  • Fixed features (manholes, planted areas, built-in borders) were deducted before entering area.
✓Depth and Application+
  • Depth is appropriate for the application — decorative paths 30–50mm, driveways 50–75mm, drainage 100–150mm.
  • The depth entered is the finished (compacted) depth, not the loose depth — compaction will be applied separately.
  • Depth is entered in the correct unit — do not mix mm and cm.
  • For roof ballast, structural engineer approval for the dead load has been obtained before ordering.
  • Driveway gravel depth accounts for vehicle loads — light vehicles need minimum 50mm, heavy vehicles 75mm.
✓Gravel Type and Size+
  • Gravel type is confirmed — decorative (rounded), drainage (single-size angular), driveway (self-binding or crusher run), or sub-base.
  • Drainage applications use single-size open-graded gravel — no fines, no crusher run, no self-binding gravel.
  • Self-binding gravel or crusher run is specified for driveways — loose decorative gravel displaces under vehicles.
  • Gravel size is appropriate — 10mm or 20mm for paths, 20mm for drainage, 20–40mm for driveways.
  • Gravel name matches the supplier's local terminology (MOT Type 1, pea gravel, hoggin, crusher run).
  • Bulk density used in the calculator matches the gravel type — pea gravel ~1,500 kg/m³, MOT Type 1 ~1,900 kg/m³.
✓Compaction+
  • Compaction factor is applied for all base layers, driveway sub-base, and self-binding gravel.
  • Compaction is set to 0% for single-size drainage gravel — compacting drainage gravel destroys its drainage performance.
  • Compaction is set to 0% for loose decorative gravel and garden paths where no compaction is applied.
  • Typical compaction factors: MOT Type 1 sub-base 15–25%, self-binding gravel 10–15%, hoggin 15–20%.
✓Wastage+
  • Wastage of at least 5% is added for all manually spread gravel.
  • Irregular areas, curved edges, and sloped ground have wastage increased to 8–12%.
  • Driveway applications include extra wastage for edge displacement and vehicle scatter — use 10%.
  • The quantity including wastage — not the net coverage quantity — is used for ordering.
✓Before Purchase+
  • The coverage area result was cross-checked against the measured site area.
  • Edging or gravel boards are in place or planned — uncontained gravel spreads beyond the intended area.
  • A weed membrane is planned under decorative gravel — not required for drainage applications.
  • Delivery vehicle access to the site was confirmed before ordering bulk gravel.
  • Currency and units match the supplier quotation.
  • Delivery charges and taxes were confirmed separately.
  • Supplier delivery unit (bulk bag, loose load, tonne) matches the unit in the result.
Inspection Notes+
Confirm whether the calculation starts from quantity, target area, or achievable depth.
Measure the finished area and use a layer depth appropriate for the intended path, border, driveway, or drainage application.
Check the supplier's actual bag weight and material density before placing the order.
Common Mistakes+

Using One Density for Every Gravel

Slate chip, pea gravel, crushed granite, and MOT Type 1 have different bulk densities and therefore cover different areas per tonne.

Ignoring Edge and Spreading Loss

Unedged paths and borders lose material into adjacent soil or grass. Include suitable wastage for practical ordering.

Combining Surface and Sub-Base Layers

A decorative driveway surface and compacted structural sub-base use different materials, depths, and compaction assumptions. Calculate them separately.

Related Calculators & Guides

Gravel Coverage CalculatorCalculate gravel coverage area, quantity, bags, and achievable depth.Gravel Weight CalculatorCalculate gravel weight from rectangular, circular, triangular, L-shaped, or direct-volume measurements.Aggregate Quantity GuideReview density, wastage, compaction, and aggregate ordering principles.

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