Wienerberger Class B 65 mm Red Perforated Engineering Brick
A robust and high-performance engineering brick, the Wienerberger Class B 65 mm Red Perforated unit is designed for structural, below-DPC, and groundwork applications. Its perforated form improves weight and handling without compromising strength. Unlike facing bricks, this engineering brick is valued for performance — strength, low water uptake, and stability — rather than appearance.
Built to perform in the toughest conditions, this brick delivers excellent compressive strength and durability, making it ideal for foundations, retaining walls, sewers, and any masonry work that demands structural integrity.
Key Specifications
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Dimensions (L × W × H):215 × 102.5 × 65 mm
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Pack quantity:400 bricks per pack
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Type / configuration:Perforated, wirecut engineering brick
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Compressive strength:? 75 N/mm² (Class B standard)
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Water absorption:? 7 %
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Durability designation:F2
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Production method:Extruded / wirecut
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Colour:Red
Why Choose Class B Red Perforated Engineering Brick?
When strength and durability matter more than façade aesthetics, this brick is a go-to choice. Its high compressive strength (? 75 N/mm²) ensures it can handle demanding structural loads, while its low water absorption (? 7 %) reduces the risk of moisture damage and freeze/thaw stress. As a Class B engineering brick (rather than Class A), it hits a sweet spot for many construction tasks that require performance without the extra cost of ultra-high spec units.
The perforated design reduces weight, aids mortar keying, and makes handling easier, without undermining structural capacity. This brick is not intended for decorative appearance, but rather for projects where durability, load resistance, and moisture control are critical.
Frequently Asked Questions
Can I use this engineering brick for visible external walls?
You *can*, but it’s not ideal for decorative purposes. Engineering bricks are manufactured for performance, not appearance. Expect variation in texture, colour, and finish. If aesthetics are important, a facing brick is usually preferred.
Why is perforation used in engineering bricks?
Perforations reduce the brick’s weight, improve mortar grip (keying), and help with drying and handling — all without significantly affecting compressive strength when properly designed.
Is “? 7 % water absorption” good for UK conditions?
Yes. For an engineering brick, ? 7 % absorption is in line with Class B standards and is considered acceptable for durable, moisture-resilient construction, especially when combined with correct detailing (DPCs, drainage, etc.).
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