How we supply it: Kerb stones are arranged through a partner precast maker who quotes, supplies and bills them and pays us a referral commission. We supply what goes under and around them: 20 mm or 40 mm jalli and M-Sand for the PCC bed and GSB for the drive, with a minimum of one load of about 18 MT.
In one line: A kerb stone is a precast concrete edging unit set along the boundary of a paved area to restrain its edge, separate it from the next surface and direct surface water.
What kerbs do on a house plot
A kerb stone is a precast concrete edging unit set along the boundary of a paved area to restrain its edge, separate it from the next surface and direct surface water.
On a house plot the edge-restraint job matters most. Without a fixed edge, interlocking pavers creep outward and the joints open.
Kerb types
| Type | Face | Typical use |
|---|---|---|
| Barrier kerb | Raised, near-vertical | Internal roads in layouts, protecting compound walls |
| Semi-barrier (mountable) kerb | Raised, sloped | Driveway edges a car may occasionally cross |
| Flush (edging) kerb | Level with the paving | Paver edge restraint beside lawns and walls |
| Drop kerb | Lowered section | Gate entries and ramps |
| Channel unit | Dished | Carrying surface water along an edge |
Which kerb where
| Situation | Kerb | Bedding |
|---|---|---|
| Driveway edge beside a lawn | Flush edging kerb | PCC strip |
| Drive edge that cars must not cut across | Semi-barrier kerb | PCC strip with back haunch |
| Layout internal road | Barrier kerb | PCC strip, haunch on the back |
| Gate entry | Drop kerb | PCC strip |
Setting kerbs, step by step
Bed thickness and joint widths above are typical house-site values.
- Mark line and level with a string; set the kerb top to the finished paver level or to the upstand on the drawing.
- Dig a trench and cast a lean concrete bed, commonly 1:3:6 with 20 mm or 40 mm jalli, about 100–150 mm thick.
- Set the kerbs on a mortar bed, tapping them to line and level.
- Leave 5–10 mm joints and point them, keeping any weep gaps the drawing shows.
- Haunch the back with concrete so the kerb cannot tilt outward.
- Lay pavers only after the haunch has cured.
Counting kerbs and bed concrete
Typical estimate: count = running length ÷ unit length, plus 5% for cuts and breakage; nominal 1:3:6 mix with dry-volume factor 1.54.
That jalli quantity is well below our one-load minimum of about 18 MT. Time it with a bigger order, such as the GSB for the drive.
- 500 mm units: 2 per running metre; 600 mm units: 1.67 per metre
- A 30 m driveway edged on both sides with 500 mm kerbs: 120 units, about 126 with cuts
- Bed 300 mm wide × 100 mm deep × 60 m = 1.8 m³ of PCC: about 2.6 MT of jalli, 1.4 MT of M-Sand and 8 bags of cement
Checks on a kerb delivery
- Measure several units against the order; height differences show up along a straight line.
- Look for honeycombing, cracks and broken corners.
- Ask for the lot's compressive-strength results.
- Check the face profile and chamfer are the same across the whole delivery.
- Count against the slip, including drop and corner units.
Handling heavy units
- Store on timber battens, standing or on their sides, never tipped in a heap.
- Lift with two people or a kerb clamp: a 500 × 300 × 150 mm unit weighs about 54 kg.
- Stack along the line where they will be laid to avoid moving them twice.
Kerb faults that show after one monsoon
- No back haunch, so kerbs lean out once the soil behind gets wet.
- Laying pavers before the kerb concrete has cured.
- Kerb tops set below paver level, so water ponds against them.
- A raised kerb across the gate instead of a drop kerb.
- No weep gaps where the drawing sends water through the kerb line.