6F5 Capping delivered in Slough
6F5 is a coarse graded capping material to Specification for Highway Works Clause 613, used to build a working platform over weak subgrades before the sub-base goes down. On soft ground it is far more economical than importing extra Type 1, and it spreads and compacts into a stable layer that protects the formation through the wet.
Into Slough and across Berkshire we supply it loose by tipper, by grab lorry where a stockpile has to be loaded or reached over a boundary, or in bulk bags for plots a lorry can't discharge into. Stocked lines within 24–72 hours across SL postcodes. Artic and 8-wheel loads for trading-estate and Heathrow-corridor work with timed gate bookings; grab and bulk bags for town-centre plots.
Specification
- Grading
- Coarse graded, nominal 0–125 mm
- Specification
- SHW Clause 613 capping (Class 6F5)
- Material
- Primary crushed rock
- Typical layer thickness
- Commonly 300–600 mm, per design
- Supply formats
- Loose tipper, artic bulk loads
- Typical load
- 16–20 t tipper, 28–29 t artic
Lead time
Stocked line — most postcodes in England and Wales are dispatched within 24–72 hours of order confirmation. Scotland and Highland deliveries are typically 3–5 working days. Programmed civils schedules are booked in advance and delivered to your call-off dates.
Typical uses on Slough sites
- Capping layer over weak or CBR-deficient subgrades
- Temporary haul roads and site working platforms
- Highways and adopted road construction to SHW spec
- Bulk fill and level-up on earthworks schemes
Industrial and data-centre plots take volume Type 1 and capping to a strict daily tonnage, often with vehicle-booking systems and timed gate slots. Residential regeneration in the town centre is the opposite — tight plots, grab access and phased small loads. Made ground on former industrial land makes WAC classification routine.
What shapes 6F5 Capping supply in Slough
Made ground on former industrial plots is exactly why 6F5 Capping moves in volume around Slough — it builds a working platform that takes plant and lorry traffic before any sub-base goes down. Vehicle-booking systems and timed gate slots on data-centre and industrial plots decide whether it arrives by tipper, grab or bulk bag. Where the same site is also producing made ground that makes WAC classification routine before anything moves, we plan the removal and the delivery together so the lorry is not running one leg empty. The same routes serve Windsor, Maidenhead and Uxbridge.
Questions we get asked
What is the difference between 6F5 and 6F2 capping?
Both are capping materials under SHW Clause 613. 6F5 is typically a coarser graded fill used where a thicker, robust platform is needed; 6F2 is the finer of the two gradings and is widely used as general capping fill. Follow your earthworks specification for which class is required.
How thick should a 6F5 capping layer be?
Thickness is a design decision based on subgrade CBR and the loading above — commonly 300–600 mm. Your geotechnical engineer should specify it; we supply the tonnage against the design.
Do you cover Windsor, Maidenhead and Uxbridge?
Yes — those and Staines, Iver, Langley and Burnham are on the same east Berkshire routes.
Material out as well as in, around Slough
Most deliveries into Slough pair with a removal: the lorry takes your arisings to a licensed facility and comes back loaded, so you pay for one movement rather than two.
Need 6f5 capping in Slough?
Send us the tonnage, postcode and access — quote back within one working day.