The Commons 73 mm is part of Forterra’s London Brick “common” range — designed to be used in non-decorative or backing wall applications where face quality is not critical. Though not intended as a façade brick, it retains the London Brick proportions and manufacturing consistency, which makes it useful for infill, internal partitions, or behind cladding—especially when matching the London Brick aesthetic is helpful.
Manufactured by a pressed process with a smooth texture, the Commons 73 mm has the classic proportions of London Brick but in a deeper 73 mm depth instead of the standard 65 mm. Because it is a common (utility) brick, you should expect normal variations, blemishes, and no guarantee of perfect colour or texture. It’s structurally stable but not intended for exposed external surfaces.
With a durability rating of F1 and a water absorption of 23 %, this brick meets standard utility brick demands. When used in appropriate settings (protected or covered walls, internal use, or behind rainscreen systems), it performs reliably. Its strength and specification ensure it integrates well into masonry constructs where visual performance is secondary.
Key Specifications
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Size:215 × 102.5 × 73 mm
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Colour:Common (utility stock — may vary)
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Texture:Smooth
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Water Absorption:? 23 %
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Durability:F1 (for non-exposed use)
Frequently Asked Questions
What’s the difference between Commons 73 mm and a standard London Brick?
Commons 73 mm is a **utility / common** brick — less concerned with appearance and more with structural function. It may have blemishes, variations, or imperfections, unlike a “facing” brick. Its depth (73 mm) is deeper than the typical 65 mm London Brick, so it's often used for thicker walls or matching existing deeper brickwork.
Can I use Commons 73 mm in exposed external walls?
Not ideally. As a common brick, it’s not intended for exposed facades. If used externally, it should be covered (behind cladding, render, or rainscreen) so that its surface imperfections and softer visual quality are hidden. In exposed climates, a true facing brick with better visual and durability specifications is preferred.
Does the 23 % water absorption make it unsuitable for damp or wet environments?
While **23 % absorption** is relatively high, in the proper context (non-exposed or protected conditions) it is acceptable. Since Commons bricks are typically not the outer face, moisture protection comes from the outer layers. Good detailing (cavities, waterproofing, drainage) is still important to prevent moisture reaching the internal structure.
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