UK’s leading producer of Posi-Joist metal web joists
What are Posi-Joist
metal web joists?
Posi-Joist metal web joists are a hybrid structural building material that combine stress-graded timber chords with steel webbing, resulting in a robust, lightweight and adaptable system designed for use in both flooring and roofing applications.
Also known as Eco-Joists, Metal-Web and Easi-Joist each joist features a top and bottom chord, steel webs, and end supports. Unlike traditional solid timber joists, Posi-Joist metal web joists are engineered using specialist MiTek software and manufactured from our 12 Crendon Timber Engineering manufacturing facilities across England and Wales.
With the flexible design, Posi-Joist metal web joists enable adjustments to load capacities, specific configurations and placements before production begins.
What are the
benefits of Posi-Joist?
Posi-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 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.
Contact us on sales.crendon@crendon.co.uk
Why Choose Posi-Joist?
There are many reasons to choose Posi-Joist metal web joists in your build:
Longer Spans
Easy Routing for other trades
Lightweight
Simple Installation
High Quality
Zero Shrinkage
Discover the Key Advantages of
Posi-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 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 offers a quieter, more stable flooring solution compared to traditional solid timber joists. Thanks to reduced moisture content and shrinkage, this precision-engineered system significantly minimises the risk of movement and floor squeaks over time, providing long-term performance and peace of mind.
Acoustic Performance
Posi-Joist 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.
Want to know more?
Email us here: sales.crendon@crendon.co.uk
Call us on 01844 201020
Technical specification
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Posi-Joist metal web joists FAQ’s
What is a Posi-Joist metal web joist?
A Posi-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?
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 commonly used?
Posi-Joist metal web joists are typically used in floor and flat roof systems for residential and commercial projects.
Are Posi-Joist metal web joists made to order?
Yes. Every Posi-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-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 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 cost?
The cost of Posi-Joist metal web joist 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 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-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 are installed to the highest standards with minimal disruption.
How is an Posi-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 are also lightweight and easy to handle.
Are they environmentally friendly?
Yes, our Posi-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 is tailored to your specific project needs by our in-house design team.
Crendon Timber Engineering
For 55 years we’ve been at the forefront in the design and manufacture of engineered timber products. Today, we’re constantly working with our customers to create new levels of on-site efficiency, exceptional service and innovative thinking, meaning our products help builders and developers deliver more and better new homes.