Wienerberger K209 Blue Perforated Class B 65 mm Engineering Brick
The K209 Blue Perforated engineering brick is designed for structural use where strength and low water absorption are critical. Its blue colouring and perforated form deliver a balance of performance and economy. Because engineering bricks focus on technical properties, surface finish and tone variation are typical, so mixing from multiple packs is advisable.
Key Specifications
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Size:215mm × 102.5mm × 65mm
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Colour:Blue
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Texture:Smooth, Perforated Engineering Brick
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Water Absorption:? 7%
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Durability:F2
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Compressive Strength:? 75 N/mm²
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Pack Quantity:504
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Active Soluble Salts:S2
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Gross Dry Density:~1,800 kg/m³
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Reaction to Fire:Class A1
Description & Usage Notes
Manufactured using the extruded method with vertical perforations, this brick offers reduced weight without compromising core structural performance. Its low absorption (? 7%) and high strength (? 75 N/mm²) are tailored for demanding structural applications, such as foundations, retaining walls, and load-bearing masonry. Because aesthetics are secondary in engineering bricks, consistency of colour and surface may vary between packs. For facades or visible work, a facing brick is recommended. Use proper detailing—good mortar selection, drainage, flashing, and correct wall design—to ensure long-term durability.
FAQs
Why use a perforated engineering brick rather than a solid one?
Perforations reduce weight and material usage while retaining strength and load capacity, making the brick more economical for many structural applications.
Is ? 7% water absorption reliable for structural use?
Yes — for Class B engineering bricks, ? 7% absorption is a standard requirement that helps resist moisture ingress in harsh conditions.
Can this be used where appearance matters?
It can, but keep in mind engineering bricks are produced for performance, not appearance. You may see shading or texture variation. For visual consistency, use a dedicated facing brick.
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