Metal web joist Posi-Rafters
Choose Crendon Timber Engineering for metal web joist Posi-Rafter Systems.
Crendon Timber Engineering designs and manufactures metal web joist Posi-Rafters systems that combine structural strength with flexibility and ease of installation. Manufactured off-site with precision and tailored to your project requirements, they help streamline roof construction, improve service integration and reduce on-site complexity.
Suitable for residential and light commercial applications, metal web joist Posi-Rafters provide a consistent and reliable structural solution.
Why Choose Crendon Timber Engineering metal web joist Posi-Rafters?
Crendon Timber Engineering provides a fully integrated approach to design, manufacture and supply, ensuring every system is developed to suit your project requirements.
Our experienced design teams work closely with developers, architects and contractors to optimise roof layouts and improve coordination on-site. Detailed drawings and reliable manufacturing and coordinated delivery help maintain programme certainty.
Key benefits of working with Crendon include:
- Bespoke metal web joist Posi-Rafters design tailored to each project
- Metal web technology for improved service integration
- In-house design and engineering expertise
- Full technical support and detailed design drawings
- Reliable manufacturing and coordinated delivery
- Suitable for residential and light commercial applications
- Reduced need for drilling, notching or on-site modification
- Trusted by developers, contractors and housebuilders across the UK
Crendon Timber Engineering delivers metal web joist Posi-Rafters systems that improve coordination, efficiency and performance, helping you build smarter and faster.
What is a metal web joist Posi-Rafters?
A metal web joist Posi-Rafters is an engineered roof rafter that incorporates metal web technology between timber chords, creating a lightweight yet strong structural member.
Unlike traditional solid timber rafters, the open web design allows for easy routing of services such as ventilation, electrical and plumbing systems within the roof zone. This eliminates the need for drilling or notching and simplifies coordination between trades.
Metal web joist Posi-Rafters are commonly used in residential roofs, extensions and developments where efficiency, flexibility and performance are key.
Case Study
The Learning Disability and Autism (LDA) Unit
We used metal web joist Posi-Rafters at The Learning Disability and Autism (LDA) Unit at Langdon Hospital in Dawlish.
By delivering these prefabricated components, we
- significantly reduced on-site build time
- supported improved health and safety
- allowed for easier coordination between trades.
Get a free quote: contact us on sales.crendon@crendon.co.uk
Complete structural packages
Crendon Timber Engineering provides fully integrated timber engineering solutions, ensuring your metal web joist Posi-Rafter systems work seamlessly with the wider roof and floor structure.
In addition to the designed, engineered structural elements, we can supply all ancillary items required to complete your roof structure as part of a convenient, coordinated package. This simplifies procurement, reduces site delays and improves overall build efficiency.
Posi-Rafters can be supplied alongside:
We can also provide supporting components where required, ensuring everything arrives together and ready for installation.
What are the Benefits of metal web joist Posi-Rafters?
Improved Service Integration
Open metal web design allows easy routing of services without the need for drilling or notching.
Faster Installation
Lightweight and easy to handle, reducing installation time on site.
Reduced On-Site Labour
Minimises additional work required for service installation and structural adjustments.
Enhanced Structural Performance
Engineered for strength and stability across a range of roof applications.
Greater Design Flexibility
Suitable for a variety of roof layouts and configurations.
Improved Build Efficiency
Streamlines construction and reduces programme duration.
Consistent Quality
Manufactured off-site for accuracy and reliability.
Metal web joist Posi-Rafter FAQs
Find answers to common questions about Posi-Rafter systems, their applications and installation.
What is a Posi-Rafter?
A Posi-Rafter is an engineered roof rafter that uses metal web technology to create a lightweight yet strong structural member. The open web design allows services such as plumbing, electrics and ventilation to pass through the rafter depth without the need for drilling or notching, improving efficiency and coordination on-site.
What is the difference between a Posi-Rafter and a traditional rafter?
A Posi-Rafter uses metal web construction, allowing services to pass through the rafter zone, unlike solid timber rafters which require drilling or notching.
Where are Posi-Rafters typically used?
Posi-Rafter are commonly used in residential roofs, extensions and developments where service integration and efficiency are important.
Can services run through Posi-Rafters?
Yes, the open web design allows easy routing of electrical, plumbing and ventilation services.
Are Posi-Rafters structurally strong?
Yes, Posi-Rafter are engineered to provide excellent structural performance while remaining lightweight.
Do you provide design support?
Yes, Crendon offers full design and engineering support to ensure the correct solution for your project.
Are Posi-Rafters quicker to install?
Yes, their lightweight design and reduced need for on-site modification help speed up installation. Crendon also offers a Supply & Fit service where required.
How far can a Posi-Rafter span?
The span of a Posi-Rafter will depend on factors such as rafter depth, roof design and load requirements. Posi-Rafters can achieve longer spans than traditional solid timber rafters, making them suitable for a wide range of residential and light commercial roof structures. Each system is engineered to suit the specific project, with full design support provided.
Are Posi-Rafters suitable for loft conversions?
Yes, Posi-Rafters are well suited to loft conversions and extensions. Their open web design allows services to be easily integrated within the roof structure, reducing the need for additional structural alterations and simplifying installation within existing or constrained spaces.
How are Posi-Rafters installed?
Posi-Rafters are manufactured off-site and delivered ready for installation. They are typically installed using standard lifting methods and fixed into position according to detailed design drawings. Their lightweight construction and precision manufacture help ensure a straightforward and efficient installation process.
How much do Posi-Rafters cost?
The cost of Posi-Rafters will vary depending on factors such as span, roof design, specification and project size. While they may have a higher upfront cost than traditional rafters, they can reduce overall project costs by improving installation speed, reducing labour and simplifying service integration. For an accurate quotation tailored to your project, please contact our team.
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