Wirecut vs Fletton vs Handmade vs Engineering Bricks

Brick manufacturing method leaves physical clues. Those clues are useful when researching an existing wall, but they should be treated as evidence rather than a guaranteed product identification. A brick can be weathered, cleaned, reclaimed or altered by years of exposure, and different manufacturers can produce bricks with broadly similar characteristics.

Wirecut bricks

Wirecut manufacture generally produces a regular extruded column of clay that is cut into individual bricks with wires. The result can leave relatively consistent dimensions and characteristic linear or fine surface marks. Depending on the product, the face may be sanded, textured, drag-faced or otherwise finished after cutting. Edges are often more regular than those of genuinely handmade bricks.

When examining a suspected wirecut brick, look at more than one face. A close-up can reveal repeated horizontal or vertical cutting traces, consistent arrises and a relatively uniform body. However, modern facing bricks are available with many different textures, so the presence of a fine line is not proof of wirecut manufacture.

Fletton bricks

Fletton is a term strongly associated with bricks made from Oxford Clay, particularly in the brickmaking tradition of the South and East of England. The term is commonly encountered when researching older and twentieth-century brickwork. Fletton bricks can have distinctive fired surfaces and often occur in ordinary, economical building brickwork rather than highly decorative facing ranges.

For identification, consider the whole brick: body colour, surface texture, firing variation, dimensions, hardness, frog shape and any maker's mark. A photograph alone is rarely enough to prove that a brick is a Fletton because appearance overlaps with other products.

Handmade bricks

Handmade bricks are formed using moulds and manual handling rather than the highly continuous production associated with extrusion. Traditional handmade bricks can show subtle dimensional variation, irregular arrises, a softer or more irregular surface and marks associated with the moulding process. Sanded moulds can leave a characteristic texture.

Variation is one of the useful clues, but it must be interpreted carefully. A reclaimed wirecut brick can become chipped and irregular, while a deliberately rustic modern brick can imitate the appearance of an old handmade brick. Look for repeated manufacturing evidence across several bricks rather than judging a single damaged unit.

Engineering bricks

Engineering bricks are manufactured to provide particular technical performance, including high strength and low water absorption. In UK building terminology, Class A and Class B engineering bricks are familiar categories. Their colour can vary; red and blue engineering bricks are both encountered.

Do not identify an engineering brick by colour alone. The useful clues are the product specification, dimensions, frog or perforation arrangement, surface finish and the context in which the brick is used. A dense, hard brick in a structural or damp-exposed location may be worth investigating as a possible engineering brick, but only a verified specification establishes the classification.

How to compare the four types

• Surface: look for extrusion, cutting, moulding, sandface or firing clues.
• Regularity: compare several bricks rather than one damaged example.
• Dimensions: measure the actual brick in millimetres.
• Frog and marks: photograph the complete frog, stamp or lettering.
• Colour: use it as supporting evidence, not the sole identifier.
• Context: age, building type and location can help narrow research.

Why the distinction matters

Manufacturing type can help explain why two bricks that look similar are not the same product. It can also narrow a search when a replacement is required. A modern wirecut facing brick, a reclaimed handmade brick and an engineering brick may all be red or brown in a photograph but behave differently and have very different intended uses.

Use Find My Brick

Upload a photograph to Find My Brick and provide measurements when available. The tool is intended to narrow the search; it is not a substitute for checking a physical sample or current manufacturer specification.