Pipe bedding & surround

4/14 mm graded pipe bedding and surround

4/14 mm sits between the 4/10 and 4/20 gradings and is a practical all-rounder for standard drainage runs. It compacts well as both bed and surround while remaining coarse enough to place quickly in longer trenches, which is why many groundworks teams standardise on it across a site.

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Key specifications

Nominal size: 4/14 mm graded
Typical use class: Bedding and surround
Material: Primary crushed rock or gravel
Compaction: Good interlock, compacts in layers
Supply formats: Loose tipper, grab lorry, 850 kg bulk bag
Typical load: 16–20 t tipper, 850 kg bag

Typical uses

General-purpose bedding and surround on estate and adopted drainage
Mixed pipe diameters on the same site with one stocked size
Surround to twinwall and concrete drainage runs
Backfill to shallow chambers and gullies

Lead time and delivery

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.

Tipper, grab and artic haulage. Where we are also removing surplus from your site the same lorry returns loaded, cutting haulage cost and empty running.

Frequently asked questions

Which bedding size should I use for 225 mm pipe?

4/14 mm or 4/20 mm are both commonly used for 225 mm runs. Follow your engineer's drainage detail — where nothing is specified, 4/20 mm is the more usual choice at that diameter and above.

Can I mix bedding sizes across a site?

It's usually cheaper and simpler to standardise on one graded size where the specification allows. We'll happily review your drainage schedule and tell you where a single size covers the whole job.

Other bedding and capping sizes

Pipe Bedding 4/10 mm Pipe Bedding 10 mm Pipe Bedding 14 mm Pipe Bedding 4/20 mm Pipe Bedding 20 mm Pea Shingle 6 mm All aggregates

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