Blocks

Frequently Asked Questions – Concrete Blocks

What's the difference between 3.6N and 7.5N Mannok Aircrete Blocks?

3.6N Mannok Aircrete Blocks are commonly used for internal walls and general construction, while 7.5N blocks provide higher compressive strength for applications requiring greater structural performance. The correct block depends on your building design and structural specification. If you're unsure, our experienced team will be happy to help.

What are the advantages of aircrete blocks?

Aircrete blocks are lightweight, making them easier to handle on site than traditional dense concrete blocks. They also provide good thermal performance and are widely used in residential and commercial construction.

Which concrete blocks should I use for load-bearing walls?

The required block strength depends on your building design and structural calculations. Higher-strength blocks, such as 7.5N aircrete blocks, are commonly used where greater load-bearing performance is required. Always follow your plans or consult a structural engineer if you're unsure.

Can concrete blocks be used below ground?

Some concrete blocks are suitable for below-ground applications, while others are intended for above-ground construction only. Always check the product specification or speak to our team before purchasing.

Can concrete blocks be used externally?

Yes. Many concrete blocks are suitable for external construction and are often finished with brickwork, render or cladding. The most appropriate block depends on your project and the required finish.

Do concrete blocks provide insulation?

Aircrete blocks provide better thermal performance than traditional dense concrete blocks, helping improve the overall energy efficiency of a building. Additional insulation may still be required to meet current Building Regulations.

Do you sell concrete blocks in bulk?

Yes. We supply both individual blocks and bulk quantities for trade customers, builders and larger construction projects. Contact your local County Building Supplies branch for pricing, availability and delivery options.

Do you deliver concrete blocks?

Yes. We offer local delivery across our trading area for concrete blocks and other building materials. Delivery options may vary depending on your location and the quantity ordered. Please contact your nearest County Building Supplies branch for more information.