Wienerberger K209 Blue Engineering Perforated Engineering Brick Pack of 400

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

• Size:215mm × 102.5mm × 65mm
• Colour:Blue
• Texture:Smooth, Perforated Engineering Brick
• Water Absorption:? 7%
• Durability:F2
• Compressive Strength:? 75 N/mm²
• Pack Quantity:504
• Active Soluble Salts:S2
• Gross Dry Density:~1,800 kg/m³
• 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.

Check out our other products here.

Explore more from our range here.

At JJ Building Materials, we're committed to supplying quality building products at competitive prices, backed by the service and expertise you'd expect from an established independent merchant. Whether you're a trade professional managing large-scale projects or a homeowner taking on a DIY renovation, we're here to help you find the right products for the job.

As part of the JJ Roofing Supplies Group, we build on decades of experience supplying construction materials across the UK. We've expanded beyond roofing to offer a growing range of building materials, including timber, insulation, landscaping products, plumbing supplies, flooring, doors, bricks, fencing, garden buildings and much more – all available to order online with nationwide delivery.

We work with many of the industry's leading manufacturers to bring you trusted products that meet the highest standards of quality and performance. Our team is passionate about providing excellent customer service, competitive pricing and a straightforward shopping experience from start to finish.

When you shop with JJ Building Materials, you can expect:

• Competitive prices on leading brands and quality products.
• Nationwide delivery across the UK
  
• A constantly expanding range of building and landscaping materials.
  
• Friendly, knowledgeable customer support.
  
• A trusted business backed by the JJ Roofing Supplies Group.
  

Every order is personally reviewed by our experienced team to ensure everything is correct before dispatch. We offer delivery from as little as the next working day on selected products, so please refer to the dark blue Estimated Delivery box above for the expected delivery timeframe for this item.

We work with trusted manufacturers and specialist delivery partners to ensure your order arrives safely and on time. You'll receive tracking details once your order has been dispatched, and if we need to confirm any delivery details, one of our team will contact you directly to keep everything running smoothly.

Roof Tiles & Fittings:

We recommend ordering an additional 10% of roof tiles to allow for any breakages that may occur during delivery or handling. Roof tiles are naturally fragile, and having a few extra on site helps prevent delays and ensures your roofing project can be completed without interruption.