Rigid Pavement Design in Bognor Regis

A volumetric concrete mixer rumbling onto a Bognor Regis site marks the point where ground preparation meets structural design. Rigid pavement design means we define slab thickness, reinforcement layout, and joint spacing before a single cubic metre is poured. The concrete itself is only half the story. The subgrade beneath it—often silty sand over London Clay across the coastal plain south of Chichester—dictates long-term performance. Our team correlates test pits data with CBR values and Westergaard bending theory to size slabs that handle repeated axle loads without cracking. We also run CBR road testing on the formation layer to verify stiffness assumptions before finalising the design. Every rigid pavement we specify in Bognor Regis accounts for local groundwater levels, which sit barely a metre below ground in many parts of the town.

A rigid pavement fails from the bottom up. The subgrade matters more than the concrete.

Approach and scope

The geology around Bognor Regis is deceptively variable. Beneath the surface sands and brickearth, the underlying London Clay Formation extends across much of West Sussex. This material swells when wet and shrinks in drought—a seasonal cycle that punishes poorly designed slabs. We specify minimum 150 mm Type 1 sub-base over a geotextile separator to break capillary rise, and we model edge stresses using finite element software calibrated against UK Design Manual for Roads and Bridges (DMRB) CD 225 requirements. Joint load transfer is another detail that separates a durable pavement from one that faults within three winters. For heavily trafficked industrial yards near the Bognor Regis Business Park, we often recommend dowelled contraction joints at 4.5 m centres, with tie bars at longitudinal construction joints to prevent lane separation. Where the formation layer proves marginal, we verify improvement options using proctor tests to confirm compaction targets that match the design modulus.

Site-specific factors

Many Bognor Regis projects sit on former agricultural land where the topsoil was stripped but the underlying soft alluvium was never properly treated. We see cracking patterns that follow poor compaction, not traffic load. Pumping at joints is another tell-tale sign—water and fines migrating upward through unsealed joints erode sub-base support within two or three wet winters. A rigid pavement without adequate edge restraint curls at the corners under thermal gradients, creating voids that grow with every truck pass. We include thickened edge details and reinforced perimeter beams in all our Bognor Regis designs for this reason. The cost of repairing a failed slab on a live commercial site in the town centre, with limited access and weekend-only working windows, quickly exceeds the entire original construction budget. Getting the design right upfront is not a negotiation.

Technical parameters

Parameter	Typical value
Design standard	DMRB CD 225 / BS EN 13877
Slab thickness range	175 mm – 300 mm
Joint spacing (dowelled)	4.0 – 5.5 m
Min. sub-base thickness	150 mm Type 1
Flexural strength class	F4.5 minimum for industrial traffic
Load transfer efficiency	≥75% at contraction joints
Typical design life	40 years for access roads

Related technical services

Industrial yard and warehouse pavements

Designed for forklift point loads up to 12 tonnes and container handling, with joint layouts that match racking grids and drainage falls below 1:80.

Residential and commercial access roads

Adoptable and private road designs compliant with West Sussex County Council Section 38 requirements, including bus overrun zones and turning head geometry.

Bus depots and coach parking

Slabs engineered for sustained static wheel loads and fuel spill resistance, with surface hardeners specified where diesel standing is expected.

Common questions

What is the typical cost range for rigid pavement design on a Bognor Regis project?

Design fees for a rigid pavement in Bognor Regis typically fall between £1,280 and £5,610, depending on the pavement area, traffic loading class, and whether supplementary ground investigation is required. A small private access road sits at the lower end; a fully detailed industrial yard with dock leveller foundations and surface water drainage integration reaches the upper range.

How do you determine the right slab thickness for the ground conditions here?

We correlate CBR values from In-Situ with the design traffic expressed in million standard axles (msa). On the silty sands common across the Bognor Regis coastal plain, we typically see CBR between 3% and 6%, which drives slab thickness toward the upper end of the range unless the subgrade is stabilised or the sub-base thickened. Westergaard and finite element models both inform the final number.

Do you handle Section 38 adoption agreements with West Sussex County Council?

Yes. Our designs follow the current West Sussex design guide and DMRB standards required for Section 38 technical approval. We prepare the full submission package including longitudinal sections, jointing plans, and construction details, and we liaise with the adopting authority through to certificate.