Pipe Bedding 20 mm delivered in Cambridge
20 mm single size is a clean, high-void stone used for deep trench surround, soakaways and attenuation layers. With no fines it drains freely and does not slump into voids, so it is the default where the surround also has to store or convey water.
Into Cambridge and across East of England 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. Grab, tipper and HIAB loads across Cambridge, Ely, Huntingdon and Newmarket. Timed and out-of-hours windows for city-centre and campus sites.
Specification
- Nominal size
- 20 mm single size
- Grading
- Clean, washed, fines removed
- Material
- Primary crushed rock or washed gravel
- Void ratio
- Typically around 30% — attenuation duty
- Supply formats
- Loose tipper, grab lorry, artic, bulk bag
- 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 Cambridge sites
- Deep trench pipe surround
- Soakaway and attenuation stone
- Free-draining backfill behind retaining structures
- Filter layers under geotextile-wrapped drainage
Conservation-area access and college estates mean timed, low-disruption drops; the science-park and biomedical campus pipeline runs on bulk sub-base and drainage bedding.
What shapes Pipe Bedding 20 mm supply in Cambridge
Drainage packages on science-park, biomedical campus and college estate works around Cambridge take Pipe Bedding 20 mm in daily call-offs rather than one bulk drop, so bedding lands as each run is dug rather than sitting in the way. Conservation-area and college-estate drops needing timed, low-disruption windows decide whether it arrives by tipper, grab or bulk bag. Where the same site is also producing arisings off tightly controlled campus and college sites, we plan the removal and the delivery together so the lorry is not running one leg empty. The same routes serve Ely, Huntingdon and St Neots.
Questions we get asked
What void ratio should I design a 20 mm stone soakaway to?
Clean 20 mm single size is commonly designed at around 30% void ratio, but your drainage engineer should confirm the figure for the material and compaction assumed in the calculation.
Is 20 mm single size the same as 20 mm ballast?
No. Ballast is an all-in mix of stone and sand for concrete. 20 mm single size is a washed, clean stone with the fines removed and is not a concreting material.
Can you deliver into conservation-area streets?
Yes — HIAB, bulk bags and manual offload cover sites where a tipper cannot discharge, with timed windows to limit disruption.
Material out as well as in, around Cambridge
Most deliveries into Cambridge 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 pipe bedding 20 mm in Cambridge?
Send us the tonnage, postcode and access — quote back within one working day.