{"product_id":"wienerberger-k209-blue-engineering-perforated-engineering-brick-pack-of-400","title":"Wienerberger K209 Blue Engineering Perforated Engineering Brick Pack of 400","description":"\u003ch3\u003eWienerberger K209 Blue Perforated Class B 65 mm Engineering Brick\u003c\/h3\u003e\n\nThe 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.\n\n\u003ch3\u003eKey Specifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cb\u003eSize:\u003c\/b\u003e215mm × 102.5mm × 65mm\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eColour:\u003c\/b\u003eBlue\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eTexture:\u003c\/b\u003eSmooth, Perforated Engineering Brick\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eWater Absorption:\u003c\/b\u003e? 7%\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eDurability:\u003c\/b\u003eF2\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eCompressive Strength:\u003c\/b\u003e? 75 N\/mm²\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003ePack Quantity:\u003c\/b\u003e504\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eActive Soluble Salts:\u003c\/b\u003eS2\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eGross Dry Density:\u003c\/b\u003e~1,800 kg\/m³\u003c\/li\u003e\n\u003cli\u003e\n\u003cb\u003eReaction to Fire:\u003c\/b\u003eClass A1\u003c\/li\u003e\n\u003c\/ul\u003e\n\u003ch3\u003eDescription \u0026amp; Usage Notes\u003c\/h3\u003e 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.\n\nBecause 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.\n\n\u003ch3\u003eFAQs\u003c\/h3\u003e \u003ch4\u003eWhy use a perforated engineering brick rather than a solid one?\u003c\/h4\u003e Perforations reduce weight and material usage while retaining strength and load capacity, making the brick more economical for many structural applications. \u003ch4\u003eIs ? 7% water absorption reliable for structural use?\u003c\/h4\u003e Yes — for Class B engineering bricks, ? 7% absorption is a standard requirement that helps resist moisture ingress in harsh conditions. \u003ch4\u003eCan this be used where appearance matters?\u003c\/h4\u003e 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.\u003cp\u003eCheck out our other products \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/building-supplies\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e\u003cp\u003eExplore more from our range \u003ca href=\"https:\/\/jjbuildingmaterials.co.uk\/collections\/bricks-blocks\"\u003ehere\u003c\/a\u003e.\u003c\/p\u003e","brand":"Wienerberger","offers":[{"title":"Default Title","offer_id":54801330176342,"sku":"161980","price":524.98,"currency_code":"GBP","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0905\/4509\/4998\/files\/wienerberger-k209-blue-engineering-perforated-engineering-brick-pack-of-400-6208036.jpg?v=1785252910","url":"https:\/\/jjbuildingmaterials.co.uk\/products\/wienerberger-k209-blue-engineering-perforated-engineering-brick-pack-of-400","provider":"JJ Building Materials","version":"1.0","type":"link"}