Aggregate Types Explained: Choosing the Right Material for Your South Wales Project

Choosing the wrong aggregate is a costly mistake. This guide explains exactly which material to use for every common project in South Wales — from driveways to drainage.

Type 1 MOT Sub-Base

Best for: Driveways, paths, roads, car parks, building sub-bases

Type 1 MOT (Ministry of Transport specification) is crushed stone graded to 40mm down. It compacts under load to create a very stable base layer. In South Wales' wet climate, it's essential under driveways and paved areas to prevent sinking. Price: £25-35 per tonne delivered.

Sharp Sand

Best for: Paving bedding, mortar mixes, drainage, concrete

Sharp (coarse) sand has angular grains that lock together, making it ideal for laying block paving, patio slabs, and mixing into concrete. Don't confuse it with building sand (soft sand) which is finer and used for brickwork mortar. Price: £30-40 per tonne delivered.

Ballast (Mixed)

Best for: Concrete mixes, general fill

Ballast is a ready-mixed combination of sharp sand and gravel, ideal for making concrete. Simply add cement and water. Saves time measuring out separate aggregates for foundations, posts, and general concrete work. Price: £28-38 per tonne delivered.

Hardcore / Crushed Concrete

Best for: Sub-base fill, levelling ground, access tracks

Recycled hardcore from crushed concrete and brick is the most economical base material. Great for temporary access tracks on construction sites and as a cheap levelling fill before a Type 1 layer. Price: £22-32 per tonne delivered.

Decorative Gravel

Best for: Garden paths, driveways, drainage beds, landscaping

Available in various sizes (10mm, 20mm, 40mm) and colours. 20mm pea gravel is popular for Welsh cottage gardens. Remember to use a membrane underneath to prevent weeds. Price: £40-60 per tonne delivered.

Screened Topsoil

Best for: Lawns, gardens, landscaping, raised beds

Quality screened topsoil for new lawns, garden beds, and landscaping projects. We supply grade A topsoil suitable for growing. Price: £35-50 per tonne delivered. See our full aggregates supply page for all options.

How to Calculate How Much You Need

Aggregates for South Wales Driveways — A Practical Guide

Driveways are one of the most common aggregate applications across South Wales, and choosing the right materials and depths is critical for longevity. South Wales' high rainfall — one of the wettest regions in England and Wales — places significant drainage demands on driveway construction. A poorly designed driveway sub-base in Cardiff or Newport will deteriorate rapidly under the combination of vehicle loading and water ingress.

The standard specification for a residential driveway in South Wales is: 150mm of compacted Type 1 MOT sub-base, followed by the chosen surface course — whether block paving on a 50mm sharp sand bed, asphalt, or resin-bound gravel. For vehicles heavier than a standard car, increase the Type 1 depth to 200mm. For SUVs and vans, 175mm is typically sufficient. Our delivery drivers can advise on the right quantity based on your driveway dimensions and the chosen depth.

Planning permission considerations: since 2008, hard-standing driveways in England and Wales exceeding 5 square metres require planning permission unless they're built with a permeable surface or drain to a lawn or border. Many South Wales homeowners are choosing permeable block paving or resin-bound gravel to avoid planning issues while also managing surface water sustainably — both systems still require a well-prepared Type 1 sub-base for stability.

Road Planings — A Sustainable Aggregate Alternative

Road planings (also called tarmac planings or asphalt millings) are a recycled aggregate produced when roads are resurfaced. The existing tarmac surface is planed off by specialist milling machines and the resulting material can be reused as a cost-effective, self-binding sub-base for driveways, farm tracks, and construction site roads. Our road planings supply service provides this sustainable material across South Wales at prices significantly below virgin Type 1 MOT.

Road planings work particularly well for farm tracks, construction access roads, and areas where a cost-effective, durable surface is needed but high-specification materials aren't required. The material compacts and binds under traffic to create a stable, weather-resistant surface. For domestic driveways, planings work well as a sub-base layer beneath block paving or tarmac, but aren't recommended as a finished surface due to their uneven texture and residual bitumen content.

Combining Aggregates with Muck Away and Grab Hire

The most efficient construction projects combine waste removal and material supply through a single contractor. When you're excavating for foundations, the old soil goes out and Type 1 sub-base comes in — using the same trusted contractor for both eliminates coordination between different suppliers and often achieves better overall pricing through bundled service discounts. Our grab hire, muck away, and aggregate supply services are all available together, and many South Wales clients book all three through a single call to 01495 820164.

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