"Compressive strength, measured in N/mm², gauges how much load a brick can bear before crushing. In the UK, BS EN 771-1 requires manufacturers to declare this measurement, with engineering bricks referenced in the National Annex. Typical clay facing bricks range from 9 to 20 N/mm², while engineering bricks can reach up to ≥75 N/mm² (Class B) or ≥125 N/mm² (Class A). The NHBC suggests that you have a minimum of 9 N/mm² for one- or two-story buildings and 13 N/mm² for three-storey buildings."
"At 9 to 10 N/mm², these are suitable for outer walls, facades, and other aesthetic placements. They are lighter, easier to work with, and available in diverse textures and colours. They are not reliable for structural or high-load-bearing areas. Made to EN 771-3 standards, concrete bricks average about 22 N/mm² and offer excellent frost resistance (usually F2 rated). They're especially useful in exposed environments or where consistent color and size are required."
Compliance with Building Regulations and NHBC inspection is legally required for brick selection and procurement in UK construction. Compressive strength is measured in N/mm² and must be declared under BS EN 771-1, with engineering bricks referenced in the National Annex. Typical clay facing bricks range from 9 to 20 N/mm², while engineering bricks can be Class B (≥75 N/mm²) or Class A (≥125 N/mm²). NHBC guidance recommends minimum strengths of 9 N/mm² for one- and two-storey buildings and 13 N/mm² for three-storey buildings; bricks below 3.5 N/mm² are unsuitable for load-bearing walls. Concrete bricks to EN 771-3 average about 22 N/mm² and often carry F2 frost resistance; high-stress or below-DPC applications require 36 N/mm² or higher. Always verify declared strength against structural demands before procurement to ensure compliance and durability.
Read at London Business News | Londonlovesbusiness.com
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