UK’s leading manufacturer of Posi-Joist metal web joists / Easi-Joist metal web joists

Combining the lightness of timber with the strength of steel, Posi-Joist metal web joists / Easi-Joist metal web joists offer superior structural performance, versatility, and ease of installation. These open-web joists allow for greater spans, design flexibility, and simple service installation, making them the ideal choice for modern construction.

Posi-Joist metal web joists / Easi-Joist metal web joists

The Wyckham Blackwell Group and Crendon Timber Engineering are the UK’s leading manufacturers of Posi-Joist metal web joists / 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 Posi-Joist metal web joists / Easi-Joist metal web joists products are engineered using advanced MiTek system software, with our Easi-Joist metal web 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 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 metal web joists / Easi-Joist metal web joists 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-Joist metal web joists / Easi-Joist metal web joists features custom-engineered metal webs for improved structural performance. These joists are commonly used for floor and roof structures in timber frame and traditional builds.

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What are the
benefits of Posi-Joist metal web joists / Easi-Joist metal web joists?

Posi-Joist metal web joists / Easi-Joist metal web joists combine the lightness of timber with the strength of steel, they’re easy to install and span greater distances than timber alternatives to allow unequalled design freedom.

Posi-Joist metal web joists / Easi-Joist metal web joists offer exceptional floor performance from a minimum 72mm wide fixing surface, 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 costs.

Case Study

Clay Park, Dartington

We used Posi-Joist & Easi-Joist metal web joists on the Clay Park, Dartington development.

By using our off-site manufactured Posi-Joists, we:

reduced on-site labour and installation time
enabled easy service integration without drilling or cutting
improved overall build efficiency and programme speed

READ FULL CASE STUDY

Building under construction covered in scaffolding

Why Choose Posi-Joist metal web joists / Easi-Joist metal web joists?

There are many reasons to choose Posi-Joist metal web joists / Easi-Joist metal web joists in your build:

Longer Spans

Posi-Joist metal web joists / Easi-Joist metal web joists offer longer spans than conventional solid timber joists, all while being lighter in weight. This makes them an ideal choice for contemporary construction techniques that favour open plan living. With their extended span capabilities, Posi-Joist metal web joists / Easi-Joist metal web joists often remove the need for internal load-bearing walls or central supports, enabling more versatile and spacious floor plans.

Easy Routing for other trades

The open web configuration of Posi-Joist metal web joists / Easi-Joist metal web joists make them perfect for accommodating plumbing, electrical wiring, and ventilation. There’s no need for time-consuming drilling or notching, which speeds up installation and helps maintain the structural integrity of the joist. Whether it’s a new build or a renovation, Posi-Joist metal web joists / Easi-Joist metal web joists deliver an efficient and budget-friendly option for routing essential services.

Lightweight

By using less material while maintaining strength, Posi-Joist metal web joists / Easi-Joist metal web joists are considerably lighter than solid timber joists. This is especially advantageous on sites with limited access for cranes or when you want to avoid additional lifting equipment and costs.

Simple Installation

Custom designed and manufactured to suit your building’s dimensions, Posi-Joist metal web joists / Easi-Joist metal web joists are straightforward to position during installation. They can also be supplied with trimmable ends, offering flexibility for irregular or older structures where perfect straightness is rare.

High Quality

Each Posi-Joist metal web joists / Easi-Joist metal web joists is designed using advanced MiTek software and manufactured under strict factory conditions. This ensures consistently high quality and precision with every unit.

Zero Shrinkage

Unlike traditional timber, Posi-Joist metal web joists / Easi-Joist metal web joists resist shrinkage and warping, two of the most common causes of squeaky floors, ensuring long-term performance and comfort.

Discover the Key Advantages of
Posi-Joist metal web joists / Easi-Joist metal web joists:

Faster Installation & Extended Spans

Thanks to their open web construction and lightweight structure, they are quick to install and capable of achieving longer spans, reducing the need for intermediate supports and saving valuable build time.

Flexible Open Web Design

The signature metal web design allows complete flexibility for running plumbing, electrical and ventilation services through the joist, no drilling, cutting, or alterations needed on-site.

Easy Fixing & Large Bearing Surface

They feature a wide bearing surface, making the fixing of flooring and plasterboard quicker, easier and more secure, ideal for both builders and follow-on trades.

Precision Engineered Support

Our in-house engineering team provides detailed layout drawings and full structural design calculations, ensuring every project is backed by robust technical accuracy and tailored support.

Made-to-Measure Manufacture

Every one is bespoke, reducing on-site waste and maximising efficiency. You receive exactly what you need, nothing more, nothing less.

Quality Assured Production

Manufactured under ISO 9001-certified processes, our Posi-Joist metal web joists / Easi-Joist metal web joists meet the highest standards of quality control for strength, safety and reliability.

Complete Package from One Trusted Supplier

We provide a full solution, including design, manufacture, and optional Supply & Fit service, ensuring a seamless and hassle-free experience from start to finish.

Strength of Steel, Lightness of Timber

They combines the durability of galvanised steel webs with the light weight of engineered timber flanges, offering a perfect balance of structural integrity and ease of handling.

Reduced Material Waste & Timber Usage

Thanks to their efficient design, they use up to 20% less timber than traditional solid joists, supporting your sustainability goals while reducing costs.

Lightweight for Safer Handling

They are significantly lighter than conventional timber joists, helping to minimise the risk of manual handling injuries and simplifying transportation on-site.

Enhanced Floor Performance

Enjoy reduced vibration, greater rigidity and improved acoustic performance, feeling solid underfoot, meeting the demands of modern building standards.

Long-Term Stability

Posi-Joist metal web joists / Easi-Joist metal web joists offers a quieter, more stable flooring solution compared to traditional solid timber joists. Thanks to reduced moisture content and shrinkage, this precision-engineered solution significantly minimises the risk of movement and floor squeaks over time, providing long-term performance and peace of mind.

Acoustic Performance

Posi-Joist metal web joists / Easi-Joist metal web joists can achieve over 40dB sound reduction in separating floor applications without the need for additional insulation when installed at 219mm deep and 600mm centres*. This makes it an efficient and regulation-compliant solution for both residential and commercial projects.
*Subject to relevant design specifications and installation guidance.

Technical
specification

Site storage of Trussed Rafters & Posi-Joists

Crendon branded measuring tape sat on timber in a outdoor storage area

Posi-Joist Installation and Handling Guide

Posi-Joist metal web joists / Easi-Joist metal web joists Gallery

Posi-Joist metal web joists / Easi-Joist metal web joists FAQs

What is a Posi-Joist metal web joist / Easi-Joist metal web joist?

A Posi-Joist metal web joist / Easi-Joist metal web joist is an open-web timber joist that combines timber and metal webbing. This unique design provides strength, stability, and allows easy access for services like plumbing, wiring and ventilation.

What are benefits of Posi-Joist metal web joists / Easi-Joist metal web joists?

Easy service integration, no need for drilling or notching to run pipes and cables.

Longer spans, ideal for open-plan layouts with fewer internal supports.

Lightweight yet strong, easier to handle on-site.

Faster installation, saving time and labour costs.

Environmentally friendly, uses less timber and produces less waste.

Where are Posi-Joist metal web joists / Easi-Joist metal web joists commonly used?

Posi-Joist metal web joists / Easi-Joist metal web joists are typically used in floor and flat roofs for residential and commercial projects.

Are Posi-Joist metal web joists / Easi-Joist metal web joists made to order?

Yes. Every Posi-Joist metal web joist / Easi-Joist metal web joist is custom-designed and manufactured in-house to meet your exact project requirements and structural requirements.

Can they span longer distances than traditional joists?

Yes. Posi-Joist metal web joists / Easi-Joist metal web joists can span much further than traditional timber joists, enabling flexible design and reduced need for intermediate supports.

Do they comply with building regulations?

Absolutely. All Posi-Joist metal web joists / Easi-Joist metal web joists are designed and manufactured to meet current UK building regulations and structural standards.

What information do I need to supply to obtain a quote?

To provide you with an accurate and competitive quote, we’ll need:

Floor or roof layouts
Span and spacing details
Loading requirements (dead and live loads)
Service requirements (ducting, pipes, etc.)
Site location and access details

Our specialist team is happy to guide you through the process and advise on what’s needed if you’re unsure.

How much do Posi-Joist metal web joists / Easi-Joist metal web joists cost?

The cost of Posi-Joist metal web joists / Easi-Joist metal web joists depends on the size, complexity and specifications of your project. We offer a free quotation service, simply send us your architectural drawings and key details to receive an accurate price tailored to your build.

What is the lifespan of Posi-Joist metal web joists / Easi-Joist metal web joists?

When installed correctly and protected from moisture, our timber products can last for 60 years or more in line with UK building regulations.

How quickly can I get Posi-Joist metal web joists / Easi-Joist metal web joists delivered?

We can deliver as quickly as five working days from receipt of signed drawings using our FASTRACK delivery service. Our current lead times are updated weekly on the home page of our website

Do you provide technical support?

Yes. Our in-house design team offers full technical support including layout drawings, load calculations and advice on installation best practices.

Can you help with installation?

Yes. For larger or more complex projects we can offer a full Supply & Fit service, managing your installation from start to finish. Our fully certified carpentry teams, overseen by experienced Contract Managers, ensure your Posi-Joist metal web joists / Easi-Joist metal web joists are installed to the highest standards with minimal disruption.

How is an Posi-Joist metal web joist / Easi-Joist metal web joist different from traditional joists?

It offers better strength-to-weight ratio, longer clear spans, and built-in routes for plumbing, ventilation, and electrics.

What are the benefits for installers?

Installers save time and labour as no drilling is needed for services. The Posi-Joist metal web joists / Easi-Joist metal web joists are also lightweight and easy to handle.

Are they environmentally friendly?

Yes, our Posi-Joist metal web joists / Easi-Joist metal web joists are manufactured from PEFC certified timber and use less timber overall with less waste, making them a more sustainable option.

Can they be custom designed?

Definitely. Every Posi-Joist metal web joist / Easi-Joist metal web joist is tailored to your specific project needs by our in-house design team.

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:

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