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Engineering bricks are designed for use where strength and low levels of water absorption are paramount, traditionally this may be on applications such as retaining walls or for ground works.
They are specifically manufactured to be denser and stronger than ordinary facing bricks. They are supplied in accordance with two different classifications; Class A and Class B. This is based on minimum compressive strength and maximum water absorption not falling below 70 N/mm 2-4.5% and 50 N/mm 2-7% respectively.
The majority of engineering bricks sold in the UK are smooth red Class B bricks, as they are among the most cost effective and durable bricks available to the construction industry.