Engineering brick

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Wolverton Viaduct on the West Coast Main Line

Engineering bricks are a type of brick used where strength, low water porosity or acid (flue gas) resistance are needed. Engineering bricks can be used for damp-proof courses.[1]

Clay engineering bricks are defined in § 6.4.51 of British Standard BS ISO 6707-1;2014 (buildings & civil engineering works - vocabulary - general terms) as "fire-clay brick that has a dense and strong semi-vitreous body and which conforms to defined limits for water absorption and compressive strength"[2]

Stronger and less porous engineering bricks (UK Class A) are usually blue due to the higher firing temperature[3] whilst class B bricks are usually red. Class A bricks have a strength of 125 N/mm2 (18,100 lbf/sq in) and water absorption of less than 4.5%; Class B bricks have a strength greater than 75 N/mm2 (10,900 lbf/sq in) and water absorption of less than 7%.[citation needed]

Accrington brick is a type of engineering brick that was used in the construction of the foundations in the Empire State Building.[citation needed]

See also[edit]


  1. ^ "Glossary of Terms".
  2. ^
  3. ^ "Brick". Archived from the original on 2015-07-04.