

Aggregates
We accept brick, concrete and inert soil to produce quality recycled aggregates and double screened topsoil.
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D Underwood & Son Ltd are licenced waste carriers.
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We specialise in backloading our vehicles wherever possible, bringing aggregates into a job and also taking spoil loads away.
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We can remove any amount of spoil from individual loads to organising large muckshifts requiring multiple vehicles.
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We supply a range of recycled materials to the utilities and construction industry to help protect the environment and reduce our carbon footprint.
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Our aggregates are produced in accordance with the wrap quality protocol and our recycled stone has been tested, verified, and formally listed in the YHAUC (Yorkshire Highways Authorities & Utilities Committee) Approved Materials and Suppliers List.
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Additional to the list of materials we stock below, we can also produce aggregates to order - just get in touch with your requirements!
Our Products and Services
Recycled Stone
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Type 1 (40mm to dust or 20mm to dust) -
This is one of our top products. Recycled to YHAUC standard making it certified for use in highways.
Recycled Type 1 stone, often referred to as Type 1 recycled aggregate, is a crushed material typically made from concrete, brick, and asphalt. It's a sustainable alternative to quarried Type 1 MOT (Ministry of Transport) stone.
Common Uses of Recycled Type 1 Stone:
Sub-base for Roads and Driveways
It provides a strong, compacted foundation under tarmac, concrete, block paving, or gravel.
Patio and Pathway Bases
Ideal as a load-bearing layer under patios and garden paths.
Car Parks and Hardstandings
Used in the base layer for car parks, especially where sustainability or cost is a factor.
Temporary Access Roads
Often used on construction sites to form durable temporary access routes.
General Backfill
Suitable for filling voids, such as around foundations or drainage works.
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3" clean
3" clean aggregate (also called 3-inch clean stone or simply clean 3" rock) is a coarse, screened stone with particles around 3 inches in size and minimal to no fines (i.e., no small particles or dust). Because it's "clean," it allows for excellent drainage. Here's what it's typically used for:
Common Uses of 3" Clean Aggregate:
Drainage and Erosion Control
Used in French drains, retaining wall backfill, and culvert bedding.
Its size and lack of fines allow water to pass freely, preventing buildup and erosion.
Base Material for Roads and Construction Pads
Used as a foundation layer in heavy-duty construction areas like:
* Logging roads
* Access roads
* Temporary construction roads or platforms
Stabilization in Wet or Soft Ground
Laid directly on soft, muddy, or clay-heavy ground to stabilize the area.
The large stones bridge soft spots and prevent rutting or sinking.
Erosion Prevention
Placed on slopes or drainage ditches to slow water runoff and prevent soil washout.
Railroad Ballast (sometimes) Although railway ballast is usually 1.5–2.5", 3" stone may be used in heavy-duty or industrial sidings.
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Not Suitable For:
* Final surfacing (too large and rough)
* Areas requiring tight compaction (lacks fines to bind the material)
* Residential paths or patios (uncomfortable and unstable underfoot)
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40mm clean & 20mm clean
typically made from crushed concrete, brick, or stone—with minimal fines (dust or small particles). Because they are "clean," they offer good drainage properties, unlike Type 1 sub-base materials which include fines for compaction.
Here’s a breakdown of what each is good for:
🔹 20mm Clean Recycled Stone
Drainage Layers
Around land drains, perforated pipes, or soakaways.
Ideal where water needs to flow freely without clogging.
Sub-Base for Permeable Surfaces
Used under permeable block paving or gravel driveways where water infiltration is needed.
Backfill for Retaining Walls
Helps relieve hydrostatic pressure by promoting drainage behind the wall.
Hardcore Base in Landscaping
Forms a base layer for paths, garden features, or greenhouses.
Pipe Bedding (in larger trenches)
Provides a supportive, free-draining base around underground utilities.
🔹 40mm Clean Recycled Stone
Heavier-Duty Drainage
Used in soakaways, large French drains, and swales where more water needs to flow through quickly.
Sub-Base for Roads or Access Tracks
Used where a permeable and stable base layer is needed before applying finer layers.
Basement Waterproofing and Backfill
Drains water away from foundations or retaining structures.
Flood Prevention Systems
Incorporated into sustainable drainage systems (SuDS) for stormwater control.
Stabilisation on Wet Ground
Can be used to build up firm bases in poorly drained or muddy areas.
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These materials don’t compact as tightly as MOT Type 1 due to the absence of fines.
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Not suitable for surfaces requiring a smooth, firm finish, unless topped with finer materials.
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6F2 / 6f5
6F2 aggregate is a crushed demolition material, typically made from recycled concrete, brick, hardcore, and stone. It's a well-graded, coarse fill material that includes both larger chunks and fine particles, making it suitable for compaction and load-bearing.
What 6F2 Aggregate Is Used For:
Sub-Base for Roads and Pavements
Commonly used as the bottom layer beneath MOT Type 1 or tarmac.
Offers a cost-effective, strong base for temporary or permanent surfaces.
Site Preparation and Bulk Fill
Used to raise ground levels or fill voids on construction sites.
Helps stabilise soft or uneven ground before building or surfacing.
Hardstandings and Access Roads
Ideal for creating temporary construction site access roads, car parks, or equipment laydown areas.
Piling Mats
Used in piling operations to create stable mats for heavy machinery and rigs.
General Backfill
Suitable for backfilling foundations, retaining walls, or around large underground structures.
Gravel
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10mm or 20mm gravel
Recycled gravel aggregate is made by crushing and screening construction and demolition waste—typically concrete, brick, asphalt, and natural stone—into small, gravel-sized particles. It's a cost-effective and environmentally friendly alternative to quarried gravel, and it has a range of practical uses.
Common Uses of Recycled Gravel Aggregate
🔹 1. Sub-Base for Roads, Driveways & Patios
Provides a solid foundation layer under asphalt, concrete, or paving.
Often used in combination with finer materials like Type 1 MOT or sharp sand.
🔹 2. Drainage Layers
Clean (washed) recycled gravel (no fines) allows for good water flow.
Used in French drains, soakaways, and backfill behind retaining walls.
🔹 3. Landscaping & Garden Paths
Can be used for decorative paths, ground cover, or base layers in hardscaping projects.
🔹 4. Backfilling & Void Filling
Useful for filling trenches, around utilities, or levelling ground on sites.
🔹 5. Temporary Site Roads or Hardstandings
Can be compacted to create access tracks or temporary working surfaces for plant and machinery.
🔹 6. Pipe Bedding (if fine enough and clean)
In civil engineering, smaller sizes of clean recycled gravel may be used for non-pressurised pipe bedding, depending on site specs.
Limestone
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Type 1 Limestone (40mm to dust)
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20mm Limestone
Type 1 Limestone, often referred to as MOT Type 1 Limestone, is a high-quality, crushed aggregate that meets the UK Ministry of Transport (MOT) specification for a Type 1 granular sub-base. It’s made from crushed limestone and includes a well-graded mix of particles from fines (dust) up to about 40mm.
Primary Uses of Type 1 Limestone
🔹 1. Sub-Base for Roads, Driveways, and Paths
Used beneath tarmac, concrete, block paving, or gravel surfaces.
Provides a solid, load-bearing foundation that compacts well and supports surface layers.
🔹 2. Patio and Shed Bases
Ideal under patios, garden paths, or shed foundations.
Helps distribute weight and prevent settlement or cracking.
🔹 3. Car Parks and Hardstandings
Forms the base for car parks, lorry yards, and other trafficked areas.
🔹 4. Trench Backfill
Used to backfill service trenches, particularly where strength and compaction are required.
🔹 5. Piling Mats and Construction Platforms
Serves as a stable layer under temporary works or machinery platforms.
🏗️ Why It’s Popular:
Excellent compaction: The mix of fines and coarse particles binds tightly.
High load-bearing capacity: Suitable for vehicular and structural loads.
⚠️ Considerations:
Not permeable: Fines fill the gaps, making it poor for drainage.
Must be compacted: To achieve its full strength and stability.
If you're using it in a SuDS (Sustainable Drainage System) or anywhere water needs to flow through, a clean stone (like 20mm clean limestone) would be better.
Topsoil
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Double Screened Recycled Topsoil
While it may not be as nutrient-rich or consistent as premium screened topsoil, recycled topsoil is very useful and cost-effective for a variety of general landscaping and construction applications.
Common Uses of Recycled Topsoil
🔹 1. Landscaping and Ground Levelling
Ideal for raising ground levels, infill, or reshaping land before laying turf or planting.
Used to create garden beds, borders, and embankments.
🔹 2. Turf Laying and Lawn Preparation
Can be used under turf or grass seed when mixed or improved with compost.
A more affordable base layer before topping with finer-grade topsoil.
🔹 3. General Garden Use
Suitable for planting shrubs, hedges, or non-demanding plants.
Often mixed with organic matter to improve structure and fertility.
🔹 4. Construction Projects
Used for landscaping around buildings, road verges, and public green spaces.
Good for budget-conscious bulk coverage in large areas.
🔹 5. Sports Fields and Parks (low-grade areas)
Can be used as a base soil layer in non-elite sports pitches or public recreation areas.
Sand
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Grit Sand
Grit sand, also known as sharp sand, concreting sand, or coarse sand, is a rough-textured, angular sand made from crushed rock or natural deposits. Its gritty texture makes it ideal for construction and landscaping projects that need good drainage, strength, or binding.
Common Uses of Grit Sand
🔹 1. Block Paving and Patio Bedding
Used under block paving, slabs, or flags to create a stable, free-draining bed.
Provides a strong base that helps prevent movement or sinking.
🔹 2. Mixing with Cement (for Mortar and Concrete)
Used in floor screeds, concrete mixes, and general-purpose mortar.
Adds strength and durability due to its coarse texture.
🔹 3. Rendering and Plastering (Base Coats)
Used in external rendering as the scratch coat layer—gives grip for finishing layers.
🔹 4. Top Dressing for Lawns
Sometimes mixed with compost or soil to improve drainage and aeration in lawn maintenance.
🔹 5. Agricultural and Equestrian Use
Added to soil to improve drainage, especially in heavy clay soils.
Used in riding arenas and gallops for a firm but cushioned surface.
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Recycled Fill Sand
Recycled fill sand is a low-cost, general-purpose sand made from processed construction and demolition waste—such as crushed concrete, bricks, and occasionally subsoil or masonry. It's screened to remove large debris but may still contain small particles like stones, silt, or rubble.
While it's not as clean or uniform as washed sands, it serves well in non-structural, bulk-fill applications.
Common Uses of Recycled Fill Sand
🔹 1. Backfilling Trenches and Foundations
Used to fill around utility lines, pipework, and foundations where high strength or precision isn't required.
🔹 2. Bulk Infill for Landscaping or Site Leveling
Ideal for raising ground levels, filling voids, or reshaping terrain on construction sites or large garden areas.
🔹 3. Under Floor Slabs or Oversites
Used as a general blinding layer to smooth uneven ground before laying membranes or concrete slabs
🔹 4. Temporary Works and Site Compounds
Acts as general fill in temporary access roads, storage yards, or construction platforms.
🔹 5. Pipe Bedding (with caution)
Occasionally used for bedding non-critical pipes if free from sharp materials, though washed sand is usually preferred.
Scalpings / Road Planings
Road Scalpings / Planings
Common Uses of Road Scalpings
🔹 1. Temporary or Permanent Road Base Used as a sub-base or base layer under roads, driveways, and hardstandings.
Offers good load-bearing capacity and compacts well.
🔹 2. Temporary Access Roads
Ideal for construction site access routes or farm tracks where a firm, stable surface is needed quickly and affordably.
🔹 3. Filling and Leveling
Used to fill potholes, patch damaged roads, or level uneven surfaces before resurfacing.
🔹 4. Hardstandings and Yards
Forms a durable surface for car parks, loading bays, or storage areas.
🔹 5. Drainage Layers
Due to their coarse texture and void spaces, scalpings help with water drainage beneath paved surfaces.
Spoil Removal / Clean Hardcore Removal
Looking to clear your site quickly and efficiently? Our professional removal services are designed to handle all types of waste materials—from soil and rubble to construction debris—ensuring your project stays clean and on schedule. With reliable, timely pickups and environmentally responsible disposal, we take the hassle out of waste management so you can focus on what matters most. Whether you’re managing a small renovation or a large construction site, our experienced team offers flexible solutions tailored to your needs, competitive pricing, and outstanding customer service. Choose us for dependable spoil removal that keeps your site safe, tidy, and compliant.
Tipping Facilities
We accept brick, concrete and inert waste / soil at our facility in Bradford.
If you would like to use our tipping facility please get in touch or call in to see us.
All inert waste is weighed on our weighbridge and the rates for tipping clean hardcore start from £10 per load!