Solid Dense Concrete Block (7.3N) 440 x 215 x 100mm
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A Dense Concrete Block (7.3N) 440 x 215 x 100mm is a solid, heavy-duty building block used for constructing strong, load-bearing walls both above and below ground. With a compressive strength of 7.3N/mm², it is suitable for structural work such as foundations, external and internal walls, columns, and partitions where high strength and durability are needed. The block offers good fire resistance, sound insulation, and low water absorption, making it ideal for projects requiring robust performance and safety. Its standard size and finish allow for easy handling and compatibility with rendering or plastering. Sometimes called a Solid Dense Concrete Block or Aggregate Industries Dense Concrete Block, this term may be used interchangeably depending on the manufacturer or supplier.
As of August 2026, PriceNailer data confirms that the cheapest price for Solid Dense Concrete Block (7.3N) 440 x 215 x 100mm is £2.02 from BuildingMaterials.co.uk across 6 suppliers. Prices have increased by 6.9% over the last 17 months.
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Frequently Asked Questions
How many 7.3N dense concrete blocks do I need per square metre?
For 440 x 215 x 100mm blocks, you'll need approximately 21 blocks per square metre when laid flat. This calculation is based on the standard block dimensions plus a 10mm mortar joint. Always add 5-10% extra for cutting waste and breakages.
What is the difference between 7.3N and 3.5N concrete blocks?
7.3N blocks have double the compressive strength of 3.5N blocks (7.3N/mm² vs 3.5N/mm²). The higher strength 7.3N blocks are essential for load-bearing applications, structural walls, and foundations, while 3.5N blocks are typically used for non-load bearing partition walls.
Can 7.3N dense concrete blocks be used below ground level?
Yes, 7.3N dense concrete blocks are suitable for below ground construction including foundations and basement walls. Their low water absorption and high compressive strength make them ideal for structural work below the damp proof course. However, they should be used with appropriate damp proofing systems.
What tools do I need to cut 440mm dense concrete blocks?
You'll need a diamond blade angle grinder, block splitter, or masonry saw to cut dense concrete blocks effectively. For accurate cuts, use a diamond blade wet saw. Always wear appropriate PPE including safety glasses, dust mask, and hearing protection when cutting concrete blocks.
Are 7.3N concrete blocks suitable for internal load-bearing walls?
Yes, 7.3N concrete blocks are excellent for internal load-bearing walls due to their high compressive strength. They can support significant structural loads while providing good fire resistance and sound insulation between rooms. They're commonly used in both residential and commercial construction for structural internal walls.