Attic Trusses & Posi-Attic Systems
By maximising the living space within a given footprint, Posi-Attic systems are an increasingly popular option.
Maximise living space within the roof structure with Posi-Attic / Attic Truss.
Also known as Attic Trusses, Posi-Attic systems are timber engineered ‘room in roof’ solutions designed to create usable living space within the roof structure. They are designed to include a bottom cord which acts as a floor platform, offering greater flexibility in the building’s layout and making it easy to add an extra bedroom, en-suite or walk-in wardrobe.
Crendon Timber Engineering designs and manufactures both traditional Attic Trusses and advanced Posi-Attic systems, delivering high-performance timber solutions for modern housebuilding.
Manufactured off-site and delivered ready for installation, these systems simplify construction, reduce structural complexity and accelerate build programmes.
Posi-Attic / Attic Truss features & performance
Designed to include a bottom cord which acts as a floor platform, Attic Trusses provide a practical solution for creating additional usable space within the roof structure. They are quicker and easier to install than traditional steel beams or loose timbers, helping to simplify construction on-site.
Options for the ‘floor joist’ include strong, lightweight metal web joists, which also allow services to be easily installed without the need for additional cutting or drilling.
Complete structural packages
Crendon Timber Engineering provides fully integrated structural timber engineered solutions, ensuring Attic Trusses and Posi-Attic systems work seamlessly with:
- Roof Trusses
- Posi-Joist metal web joists
- Gable Panels
- Spandrel Panels
- Floor systems and cassette solutions
By coordinating design, manufacture and delivery across all elements, we reduce delays, simplify site logistics and improve overall build efficiency.
Get a free quote: contact us on sales.crendon@crendon.co.uk
What are the benefits of using Attic Trusses & Posi-Attic systems?
Attic Trusses and Posi-Attic systems offer a range of practical and commercial benefits, helping to maximise space, simplify construction and improve overall project efficiency.
Maximises living space
Creates additional usable rooms within the existing building footprint without increasing overall size.
Flexible design options
Choice between traditional solid timber or Posi-Joist metal web joists to suit project requirements.
Faster installation
Prefabricated systems reduce installation time compared to traditional steel or loose timber construction.
Improved service integration (Posi-Attic)
Open web design allows easy routing of services without drilling or cutting structural elements.
Reduced structural complexity
Combines floor and roof into a single engineered solution, simplifying construction.
Cost and programme efficiency
Reduces labour, build time and the need for additional structural components.
Attic Trusses & Posi-Attic Gallery
See how Crendon Timber Engineering attic systems support faster build programmes, improved site efficiency and high-quality construction.
Attic Trusses & Posi-Attic FAQs
Find answers to common questions about attic systems, including design, installation and performance.
What is the difference between an Attic Truss and a Posi-Attic?
An Attic Truss uses a solid timber bottom chord, while a Posi-Attic incorporates Posi-Joist metal web joists to allow easier service integration.
What are Attic Trusses and Posi-Attic systems used for?
Attic Trusses and Posi-Attic systems are used across residential developments to maximise internal space and build efficiency by creating functional living areas within the roof, including loft conversions, additional bedrooms, home offices and en-suites, while also supporting flexible layouts and increased floor area without expanding the building footprint.
Are these systems quicker to install?
Yes, they are faster and easier to install than traditional construction methods.
Which option should I choose?
This depends on your project requirements. Posi-Attic is ideal for service integration, while standard Attic Trusses are more cost-effective for simpler layouts.
Do you provide design support?
Yes, our in-house teams provide full design and engineering support.
Are these systems suitable for all house types?
Yes. They are suitable for a wide range of residential developments where additional roof space is required.
What is an Attic Truss / Posi-Attic?
An Attic Truss / Posi-Attic (also known as a room-in-the-roof truss) is an engineered timber truss designed to create usable living space within the roof structure. It incorporates both the roof and floor system into a single structural solution, allowing the roof space to be used for bedrooms, offices or additional living areas.
How much does an Attic Truss / Posi-Attic cost?
The cost of Attic Truss/Posi-Attic will vary depending on factors such as span, roof pitch, design complexity and project size. While attic trusses may have a higher upfront cost than standard trusses, they can reduce overall build costs by creating additional usable space without increasing the building footprint. For an accurate quotation, please contact our team.
Are Attic Trusses / Posi-Attic suitable for existing properties?
Yes, Attic Trusses / Posi-Attic must comply with UK Building Regulations. All systems are designed to meet relevant structural, thermal and fire performance requirements, and Crendon Timber Engineering provides the necessary design and calculations to support compliance.
Do Attic Trusses / Posi-Attic require UK building regulations approval?
Yes, Attic Trusses / Posi-Attic must comply with UK Building Regulations. All systems are designed to meet relevant structural, thermal and fire performance requirements, and Crendon Timber Engineering provides the necessary design and calculations to support compliance.
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