100mm BLOC Dense Concrete Block 7.3N Void Pack of 66

100mm BLOC Dense Concrete Block 7.3N Void

The 100mm BLOC Dense Concrete Block 7.3N Void is a robust, high-strength aggregate block designed for demanding structural applications. Built to perform in both above-ground and below-ground construction, it’s a dependable choice for projects where durability, fire resistance, and sound insulation are essential. Dense aggregate blocks are known for their excellent technical performance. Their solid, heavy construction delivers impressive acoustic properties, helping to reduce sound transmission between spaces. This makes them particularly suitable for residential, commercial, and industrial buildings where noise control is important. These blocks also provide an excellent key for secondary finishes, including plaster, render, drylining, and mechanical fixings. Whether used in load-bearing walls or block and beam floor systems, they offer long-lasting strength and reliability across a wide range of building types. Each block measures 440 x 215 x 100mm, with approximately 10 blocks required per m², making it easy to calculate quantities for your project. Supplied in packs of 66, they are practical to handle and store on site. These high-strength breeze blocks are a dependable choice for structural work where durability, fire resistance and acoustic performance matter, while customers looking to buy concrete blocks can use them for load-bearing walls, below-ground construction and block-and-beam floor systems.

Key Features & Benefits

• 7.3N
• Compressive
• Strength – Ideal for high-strength load-bearing walls
• Class
• A1
• Fire
• Rated – Non-combustible for maximum fire safety
• Excellent
• Acoustic
• Performance – Provides high levels of sound insulation
• Suitable
• Above & Below
• Ground – Versatile for a wide range of applications
• Great
• Key for
• Finishes & Fixings – Ideal for plaster, render, drylining, and fixings
• Durable
• Dense
• Aggregate
• Construction – Built for long-term performance
• Suitable for
• Block & Beam
• Floors – Adds structural reliability

Frequently Asked Questions

What are 100mm BLOC dense concrete blocks typically used for?

They are commonly used for load-bearing walls, internal and external walls, block and beam floors, and below-ground construction where strength and durability are required.

Are these blocks suitable for fire-resistant construction?

Yes, they are Class A1 fire rated, meaning they are non-combustible and provide excellent fire resistance.

Can these blocks be finished with plaster or render?

Absolutely. Their dense surface provides an excellent key for plaster, render, drylining, and a wide range of mechanical fixings.

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As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

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Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.

Multiple Products from the Same Supplier

If you're ordering multiple products from the same supplier, your order will be dispatched together once all items are ready. This means the longest lead time will apply.

If you need part of your order sooner, please call us on 01202 113233. We can arrange a split delivery, although an additional shipping charge will apply.