Who checks hardcore placement on a Berbera build?

Hardcore placement supervision gaps in Berbera start when nobody records what went under the slab. Hardcore is the compacted stone layer that turns an uneven excavation into a stable floor base. If the gang fills, levels and moves on without a supervisor checking each layer, soft spots, air voids and thickness shortfalls stay hidden until the floor cracks or settles.

What does unsupervised hardcore placement leave behind?

A floor base that looks level can still be loose underneath. Hardcore compacts in layers, as general practice, because a single deep fill cannot be compacted through its full depth. If the gang tips stone in one pass and tracks over it, the bottom of the layer stays loose while the top looks firm.

Water is the other weak point. A wet or soft subgrade pushes fines up into the stone and leaves voids that surface rolling cannot close. Check the actual site conditions before filling: probe the formation, look for standing water or a spongy surface, and ask the engineer to confirm whether the subgrade is fit to receive hardcore or needs treatment first.

The failure is not dramatic. A loose pocket under a slab shows up later as a hollow sound, a crack line running along a wall, or a floor that drops a few millimetres near a column. Check what the excavation looked like before filling, and whether anyone measured the layer thickness at the time.

How do you catch missed inspections before the slab goes down?

Detection depends on records that exist at the time, not a walkover afterwards. Ask for the level readings taken after each compacted layer and compare them with the formation level on the drawing. If only one finished reading exists, the layer build-up cannot be verified.

Ask three questions of the supervisor's file:

• What was the maximum loose thickness placed in each layer?
• How many compaction passes were made, and with what plant?
• Where did the layer levels sit against the design level?

For a commercial or multi-storey floor, ask whether the specification calls for a plate load test, a density test or a proof roll, and ask for the laboratory record. The rate and method come from the laboratory or the project engineer, so request them in writing rather than assuming a figure. For a small house, a proof roll under the engineer's eye plus recorded levels is often the practical check.

If the records are missing, a trial hole through the layer can show its true thickness and condition. Agree the location and method with the engineer first.

Who should be on site when hardcore is placed?

Supervision is a named person with the drawing, not whoever is nearest the gate. On a Berbera build, the chain usually runs from the client or client's representative, through a site supervisor, to the gang placing stone. Ask who signs off each layer before the next one starts.

Close the gap with a short method statement agreed before work starts. It should set the layer thickness, the compaction plant and passes, the level check, and the point at which the supervisor inspects. The contractor writes it, the engineer or client's representative approves it, and the supervisor signs each layer on a simple record sheet.

Ask your contractor, your engineer or the local authority office responsible for building works whether any records exist for the plot or for neighbouring sites, and ask what records they keep for new work. Walk a recently completed floor in the same area with the engineer to see how that base was built. Neither step replaces your own records, but both show what is normal to ask for.

Local practice varies, so confirm every limit, test type and acceptance rule against your project specification or engineer before work starts.

What to do next

Before the next hardcore layer goes down, ask the supervisor for the layer record sheet, the level readings and the compaction plant details in writing. If the records do not exist, stop the filling, get the engineer or client's representative to inspect the layer already placed, and agree a method statement with layer thickness, passes and sign-off points before work restarts.