Concrete Ballast & Kentledge Blocks

Reliable counterweights for scaffolding, hoarding and temporary works

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A complete range of precast ballast solutions

Whether you’re securing scaffolding, stabilising hoarding and fencing, or anchoring large temporary works such as cranes or wind turbines, our precast concrete ballast and kentledge blocks offer a safe, non-invasive counterweight.

With five standard sizes – from 500kg marquee weights to 5,760kg heavy-duty blocks – plus bespoke options, we supply ballast suitable for projects of all sizes. All blocks are available for purchase or hire, with UK-wide delivery and optional offload and placement services.

Scaffolding ballast blocks on a building

Explore Our Concrete Ballast & Kentledge Blocks Range

Every block in the range is built for a different type of project – from lightweight marquee anchors to heavy-duty counterweights for cranes and turbines. Whether you need manoeuvrability, maximum stability, or the flexibility to link units together, there’s a block designed to make your job easier.

All blocks are available to hire or buy, with UK-wide delivery and an optional offload and placement service.

Here’s an overview of the options available:

500kg Marquee Weights

Best for: Small events or short-term site ballast

Compact and easy to handle, these 500kg blocks are perfect for securing marquees, gazebos and other light temporary structures. The fork recess allows quick positioning with a pallet truck or forklift, making them ideal for short-term hire.

  • Dimensions: 805 × 445 × 655mm

  • Weight: 500kg

  • Handling: Fork recess + lifting loop

  • Key feature: Recessed base for pallet truck handling

  • Common applications: Marquees, gazebos, light temporary structures

View 500kg Marquee Weights

850kg Ballast Blocks

Best for: Sites needing linkable or modular ballast

A versatile option with cast-in pole holes that let you link multiple blocks together using scaffold tubes. This makes them particularly useful for scaffolding ballast or sites with access restrictions where heavier blocks aren’t practical.

  • Dimensions: 1200 × 545 × 600mm

  • Weight: 850kg

  • Handling: Fork recess + Deha lifting clutch

  • Key feature: Linkable blocks with pole holes

  • Common applications: Scaffolding ballast, site hoarding, event cabins

View 850kg Ballast Blocks

1,000kg Marquee Weights

Best for: Marquees in exposed or high-wind sites

Heavier than the 500kg option, these 1 tonne marquee weights offer greater stability for larger temporary structures or higher wind conditions. With a fork recess for easy handling, they’re a reliable choice for event organisers.

  • Dimensions: 805 × 900 × 655mm

  • Weight: 1000kg

  • Handling: Fork recess + lifting loops

  • Key feature: High stability for larger structures

  • Common applications: Large marquees, cabins, event infrastructure

View 1,000kg Marquee Weights

1,000kg Ballast Blocks

Best for: Construction and site security projects

A square-profile block with no base recess, offering maximum ground contact for stability. Two-threaded sockets allow posts to be fixed directly, making these blocks perfect for hoarding and facade retention.

  • Dimensions: 750 × 750 × 750mm
  • Weight: 1,000kg
  • Handling: Single Deha lifting clutch
  • Key feature: Threaded sockets for post fixing
  • Common applications: Hoarding, facade retention, scaffolding ballast
View 1,000kg Ballast Blocks

2,400kg Ballast Blocks

Best for: Projects needing fewer, heavier blocks

At 2.4 tonne per unit, these blocks deliver serious ballast power while still being easy to handle thanks to the fork recess. With four lifting points, they’re a safe, efficient choice for large marquees or exposed sites.

    • Dimensions: 1,000 × 1,000 × 1,000mm
    • Weight: 2,400kg
    • Handling: Fork recess + 4 lifting points
    • Key feature: Heavy ballast with safe handling
    • Common applications: Large marquees, facade retention, temporary works
View 2,400kg Ballast Blocks

5,760kg Ballast Blocks

Best for: The heaviest-duty ballast requirements

The largest block in the range, with a 2m × 2m footprint and nearly 6 tonnes of mass. Its wide base spreads load on softer ground, making it the ultimate ballast solution for cranes, wind turbines and facade retention systems.

    • Dimensions: 2,000 × 2,000 × 600mm
    • Weight: 5,760kg
    • Handling: 4 × Deha lifting clutches (one per corner)
    • Key feature: Large footprint for maximum load spread
    • Common applications: Cranes, turbines, coastal or exposed sites
View 5,760kg Ballast Blocks

Applications for concrete ballast blocks

Our blocks are designed for versatility. Typical applications include:

    • Site set-up & security – hoarding, fencing, facade retention.
    • Scaffolding ballast – reliable counterweight with linkable block options.
    • Event management – marquees, stages, cabins and large temporary structures.
    • Heavy-duty projects – cranes, turbines, and exposed sites needing serious ballast.
    • Marine use – with our optional marine mix, blocks can serve as mooring weights, buoy anchors, or sinker blocks.
Installation of precast ballast blocks at a fire-damaged hotel.

Hire or buy - your choice

You can choose between outright purchase or flexible hire:
    • Short-term hire – perfect for events, scaffolding ballast or site security.
    • Long-term hire – cost-effective option for seasonal or ongoing use.
    • Purchase – ideal if you want permanent stock for repeat projects.
See Hire Options

Handling & installation

All our blocks are manufactured with cast-in lifting points, fork recesses or threaded sockets for safe and efficient handling.
    • Delivery: direct from Nottingham with UK-wide distribution.
    • Offloading: handled with forklift, telehandler or crane.
    • Placement service: our HIAB fleet can deliver, offload and position blocks on site.
    • Efficiency: fewer heavy blocks often save time compared to combining multiple smaller units.
Talk To Our Team
Ballast blocks and marquee weights

Case Study Spotlight - Claremont Hotel

In November 2019, a devastating fire swept through the Claremont Hotel on Eastbourne seafront. The Grade II listed landmark, built in the 1850s, experienced a partial collapse, rendering the structure unstable and in urgent need of support.

To enable scaffolding to be safely erected around the building’s remains, a reliable ballast solution was required to withstand the strong coastal winds sweeping along the promenade. Maidstone Scaffolding turned to us to provide a quick, practical precast option that would maintain the structure’s stability and keep the project on track.

See The Results

Why choose our concrete ballast blocks?

Full range of sizes – 500kg to 5,760kg, covering every project need.

Hire or buy – flexible supply for short- and long-term projects.

JP Concrete Favicon Logo

Fast, safe installation – cast-in lifting points or fork recesses make handling straightforward.

Customisable – threaded sockets, Halfen channels or cast-in holes on request.

JP Concrete Favicon Logo

Marine-ready mix available – suitable for underwater ballast in mooring or anchoring applications.

Nationwide delivery – optional offload and placement with HIAB vehicles.

Comparison of Ballast & Kentledge Blocks

Block type Dimensions (mm) Weight Key features Best for
500kg Marquee Weight 805 × 445 × 655 500kg Fork recess + lifting point Marquees, gazebos, light temporary structures
850kg Ballast Block 1,200 × 545 × 600 850kg Fork recess + pole holes Scaffolding ballast, linking multiple units
1,000kg Marquee Weight 805 × 900 × 655 1,000kg Fork recess + lifting points Larger marquees, higher wind loads
1,000kg Ballast Block 750 × 750 × 750 1,000kg Square base + threaded sockets Hoarding, facade retention, scaffolding
2,400kg Ballast Block 1,000 × 1,000 × 1,000 2,400kg Fork recess + 4 lifting points Large marquees, exposed sites
5,760kg Ballast Block 2,000 × 2,000 × 600 5,760kg Wide base + 4 lifting points Cranes, turbines, high-wind or coastal projects

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    Questions We Get All The Time

    Here’s what contractors, engineers, and site teams typically want to know, and if we’ve missed yours, give us a call on 0115 895 1120 or email the team at [email protected]
    They are two names for the same product. “Kentledge” is the traditional construction term for heavy counterweights.
    Yes, we offer UK-wide delivery, with optional HIAB offload and placement to save you time and plant hire costs.
    It depends on the structure and site conditions. Smaller blocks (500kg–1T) are ideal for marquees and events, while larger blocks (2,400kg–5,760kg) are more suitable for cranes, turbines, and facade retention.
    Yes, all blocks are available for both hire and purchase, with flexible hire periods to suit short-term or long-term projects.
    No, ballast blocks are non-invasive counterweights. They don’t require foundations and can be positioned directly on an existing slab, yard, or hardstanding.
    Blocks come with cast-in lifting points or fork recesses. Smaller sizes can be moved using forklifts or telehandlers; larger sizes may need cranes.
    Yes, we can cast in threaded sockets, Halfen channels, extra lifting points, or bespoke features, depending on your project.
    Yes, with our Sensicrete® marine concrete mix, blocks can be used as mooring weights, buoy anchors, or sinker blocks in saltwater environments.
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