Metal Web Joists

Posi-Joist / Easi-Joist

The Wyckham Blackwell Group and specifically, Crendon Timber Engineering is the UK’s leading producer of Posi-Joist / Easi-Joist, metal web joists for domestic and commercial applications for both floors and roofs. They offer an engineered solution that is stronger and more adaptable than traditional alternatives.

With a minimum 72mm-wide fixing surface, they offer exceptional floor performance and the unique open web design makes it easier for plumbers and electricians to install services with no drilling, notching or cutting needed – helping reduce time and cost.

All our metal web Posi-Joist products are engineered using advanced MiTek system software, with our metal web Easi-Joist products engineered using Wolf system software. Our modern manufacturing facilities, together with our own timber treatment plants, gives us the flexibility to react quickly to customer needs, delivering a complete floor or roof system to suit your requirement and specification.

Using leading edge softwares, our highly experienced design teams produce detailed structural design drawings and calculations for any project. Our expertise helps to make cost-savings where possible and to solve complex design challenges.

Posi-Joist / Easi-Joist are constructed from two parallel stress-graded timber flanges connected to the patented V-shaped, galvanised metal web. The unique metal web design offers increased stiffness and better performance in compression when tested against the market’s leading competitors.

Posi-Attic / Easi-Attic

Also known as Attic Trusses, Posi-Attic / Easi-Attic are designed to include a bottom cord which acts as a floor platform, offering more flexibility in the building’s layout – and making it easy to add an extra bedroom, en-suite or walk-in wardrobe.

Attic Trusses are quicker and easier to install than traditional steel beams or loose timbers, and options for the ‘floor joist’ include strong, lightweight metal web joists which also allow services to be easily installed.

Posi-Joist and Easi-Joist are ideal for residential and commercial flooring, providing superior strength and stability. They are also perfect for roof structures, offering a lightweight and durable alternative to traditional joists. Their versatility makes them a great choice for attic rooms, helping to create additional usable space, while their long-span capabilities suit mezzanine flooring, maximising available headroom.

These metal web joists come with several key features. They are customisable in depth and length, allowing them to be tailored to specific project requirements. Designed for efficiency, they reduce build time by arriving on-site pre-manufactured for a faster and smoother installation. The minimal deflection properties enhance floor stability and longevity, ensuring a high-performance structure. Additionally, they are environmentally friendly, using sustainably sourced timber while optimising material efficiency.

When choosing Posi-Joist or Easi-Joist, you benefit from a  structural system engineered for long-span applications, reducing the need for intermediate supports. The open-web design allows for effortless installation of services, eliminating the need for cutting or drilling through joists. Their lightweight construction reduces labour and handling costs, making them easier to manoeuvre on-site. Most importantly, these joists are fully tested and certified to meet UK construction standards, ensuring compliance, safety, and durability.

A trusted name in timber engineering

With over 140 years if expertise in timber engineering, we are the Wyckham Blackwell Group, a leader in innovative, high-performance structural timber engineering solutions. Our commitment to quality, precision, and efficiency ensures that your project benefits from the very best in modern timber technology:

• Crendon Timber Engineering
• David Smith St Ives
• Glosford SIPS
• Harmony Timber UK
• Timber Innovations
• Wyckham Blackwell

We strive to design, manufacture and deliver top-quality metal web joists, our service includes:

• Expert design consultation for your flooring and roofing needs
• Supply & Fit options for a fully managed service
• 5-day FASTRACK delivery available to keep your project on schedule