Timber Grade: TR26, PEFC Certified
Timber Depth: 47mm
Timber Widths: 72, 97, 122, 147mm
UKCA/CE Certified (certificate no: 2812-CPR-0324)
PEFC Chain of Custody Certified (certificate no: BMT-PEFC-COC-004143)
Posi-Joists ordered online are intended for domestic floors only or flat roofs with a build up weight not exceeding 100kg per m2. Contact us for other Posi-Joist requirements.
We offer a comprehensive design, 3D model and detailed layouts for all Posi-Joist orders. All necessary strongback bracing is also included in the price above.
Step 1: Measure Your Building
Measure your building to assess what span you'll need your Posi-Joists to be and how many joists you'll need. You can either space your joists at 400 or 600 centres. If you're unsure, give us a ring and we'll talk you through it. It only takes a few minutes.
Step 2: Place Your Order
Select the depth of joist you require (deeper joists will span further), the span and the spacing, then add any drawings you might have. Don't worry if you don't have any—we will give you a ring if we need more information.
Step 3: We'll Phone You & Send a Design
Before even looking in the direction of a saw, we'll give you a ring to check all your measurements are correct. If everything looks good, we'll then send you our design for you to have a look through. If you need to make any amendments, we're always happy to do this.
Step 4: We'll Begin Manufacturing & Arrange Delivery
Once you've confirmed your order, we can begin manufacturing your Posi-Joists. One of our team will be in contact to arrange delivery on a day that suits you.
Strength
The main benefit of the Posi Joist lies in its inherent strength and stiffness. Thanks to the clever combination of timber and steel in their design, Posi-Joists can span greater distances than solid timber, reducing or even eliminating the need for load-bearing walls or steel beams.
Service Routing
Thanks to their open-web structure, Posi-Joists can accommodate various services without modification. With solid joists, an installer would have to drill, cut and hack away material, potentially limiting their strength and performance.
Weight
A Posi Joist uses less material to achieve the same strength as solid timber, making it significantly lighter.
Ease of installation
Posi-Joists are manufactured to the size of your building and can be simply dropped into place. If your building isn't perfectly straight, Posi-Joists can be supplied with trimmable ends.
Quality
Posi-Joists are designed in specialist software and produced under factory-controlled conditions, ensuring an unmatched level of quality every time.
No shrinkage
Posi-Joists don't suffer from shrinkage or distortion, a typical cause for a squeaky floor.
Whether you're a complete beginner with no knowledge of the industry building a small extension or a seasoned veteran constructing multiple homes, our MiTek trained designers will effortlessly turn your requirements into clear, lifelike designs, allowing you to view 3D models of your proposed project with our Posi-Joists in place. Our design team are on hand to assist you with every step of your project, from initial enquiry through to installation.
If you have a project that is a little too complex for online ordering, get in contact here and have a chat. We're a friendly bunch.
We have some of the best toys in the industry. We have invested over £2.5M in our brand new facility and have used almost 20 years of manufacturing experience to ensure it does exactly what we want. It’s the secret to turning your project around in as little as 5 days.
Our Saws
We run two Hundegger saws from Germany. These saws are truly incredible, allowing us to cut the timber for your project at an astonishing pace whilst achieving pin-point accuracy. The saws are fed directly from our design office and will optimise the use of every length of timber for minimal waste.
Assembling the Trusses
Once the timber components are cut, they're moved to one of our posi presses. Our skilled assemblers will then set out the timbers of your Posi-Joist on the press. The timbers are then clamped by the press to ensure they are perfectly straight and the correct depth is maintained. The steel webs are then accurately positioned in place and pressed, completing the Posi-Joist.
Timber Quality
Even the timber we use is specific to roof trusses and Posi-Joists. It's sourced from Sweden, where the cold climate ensures the tree grows slow and straight, resulting in a higher quality and more consistent product. The grading is called TR26, and is unlikely to be found at any builders merchants.
Delivery
Once the manufactured components are ready, other items such as metalwork, bracing and any additional timber will be picked to complete your order. The project is then loaded onto one of our vehicles for delivery straight to your site. From the point of confirming your order with us, we can deliver in just 5 working days.
How Are Your Posi-Joists Made?
Designing Your Posi-Joists
After you place your order online, the measurements, and drawings if supplied, will be passed onto one of our experienced MiTek trained designers. They will create a bespoke design in our specialist software, along with a 3D model, and send these to you to check and approve. Also included with your order are calculations that you can send to building control, ensuring the process is as smooth as possible.
Manufacturing Your Posi-Joists
After a designer has produced a design and you've approved it, it will be sent down to our factory to be manufactured. The timber will be cut using one of two of our Hundegger saws, then constructed by one of our skilled assemblers. Each Posi-Joist is constructed to millimetre-perfect specifications and made using the highest quality TR26 timber.
Delivering Your Posi-Joists
Finally, your Posi-Joists are loaded onto one of our own vehicles and delivered by our in-house team of drivers. In this image, we were asked to supply Posi-Joists to construct a mezzaine in a hangar at Oxford Airport. We've also made a video of this process if you'd like a bit more detail. You can watch this below.
"Absolutely first class service from design to delivery" - John, Director of Triple J Aviation Engineering
How much do Posi-Joists weigh?
Posi-Joists can weigh anything from 10kg to 50kg+ depending on their depth, spacing and span.
How many Posi-Joists are sold online?
Over 2500 Posi-Joists have been ordered online to every corner of England, and lots more via a traditional quote.
Does the span include bearings?
Yes, if your joists are sitting on your bearings, please include these in your span measurement.
What are the main advantages of Posi-Joists?
Posi-Joists offer four key advantages over traditional solid timber joists. Their lightweight construction makes them easier to transport and handle on site, while their increased spanning capability provides greater flexibility for open-plan building designs. Manufactured using specialist software and precision machinery, Posi-Joists also deliver exceptional accuracy and consistency. In addition, their open metal web design allows building services such as plumbing, electrical, and ventilation systems to pass through the joists without the need for cutting or modification, saving time and preserving structural integrity.
What maximum span can a Posi-Joist achieve?
Posi-Joists can clear span up to 7700mm if being used for a standard domestic floor. They can span further with supports.
What are your delivery options?
We can deliver trusses, joists or glulam in as little as 5-10 working days. The price for delivery depends on your location, which can range from being free to £250. We will ring you after you've placed your order to confirm which day you'd like us to deliver on using our own fleet of vehicles.
For metalwork, it'll be delivered in 1-3 working days using a courier service and costs £20. If spending more than £250 on metalwork, delivery is free.
Can Posi-Joists be used for both floors and roof structures?
Yes, Posi-Joists can be used for floors, flat roofs and as rafters. Posi-Joists ordered here online are only for floors and flat roofs.
Do I need a structural engineer when ordering Posi-Joists?
No, you don't need a structural engineer. We will design the Posi-Joist and provide you with the necessary structural calculations for building control.
Are Posi-Joists treated?
99% of the time Posi-Joists are not treated. Treatment is only necessary if you live in the red marked areas on this map. If you do require treatment, please get in touch.
Do I need to notch or drill Posi-Joists for plumbing and electrics?
No. You should never drill or notch the timber flanges or metal webs of a Posi Joist. The open metal web design is already built to accommodate large ductwork, soil pipes and electrical runs without structural alteration.