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.

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.

Check out our other products here.

Explore more from our range here.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

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.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

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.