8 reasons why housebuilders use metal web joists

What are metal web joists?

Metal web joists provide an innovative timber-engineered solution to support a floor spanning over an open area, in both domestic and commercial buildings. Metal web joist systems or floor joists are a combination of timber chords and pressed metal webs which together form an ‘open-web’ joist. Metal web joists give you unequalled design freedom across a wide range of applications for both floor and roof in domestic, industrial and commercial applications. Their open web design allows for the installation of services such as pipework, cabling, mechanical heat recovery systems and other services to be passed through the metal webs without the need for notching or drilling. Posi Joists also reduce site wastage and are environmentally sustainable.

Metal web joists are increasingly popular among UK housebuilders, providing numerous benefits in comparison to alternatives.

At Scotts Timber Engineering, we specialise in the popular precision-designed and manufactured open web floor system – easi-joists® – a cost-effective alternative to traditional timber joists. easi-joists® are parallel chord trusses which use stress-graded timber chords combined with Wolf Systems’ patented, precision-engineered metal webs. Our metal web joists are guaranteed to give your development project a layer of quality that is unequalled.

Why housebuilders use metal web joists

1. Lightweight but strong
The combination of the strong timber and lightness of easi-joists® makes a lightweight but strong floor joist, compared to solid timber joists, making it easier to handle and install on-site. Additionally, easi-joists® require fewer metal webs and use up to 20% less timber, compared to alternative engineered floor joists.

2. Quicker installation
The floor joists’ lightness can help speed up installation on-site, and require less labour, as it is easier to handle. A wide bearing provides speedy setting out and improved joist stability along with easier fixing of decking.

3. Easy installation of services and pipes
The open metal web design of floor joists removes the need to cut or drill holes in the joist. This allows easier installation of services and pipes, resulting in the reduction of surface pipework, thus, speeding up the construction time on site.

4. More design flexibility
Compared to its alternative, metal web floor joists can span greater distances which provides more design flexibility for both commercial and domestic buildings. Flexibility in design can result in a significant reduction in building costs.

5. Improved performance efficiency
easi-joists®, when used with a rigid strongback, reduce vibration and improve the overall performance of the floor. Additionally, there is less shrinkage and reduced risk of squeaky floors, therefore providing a quieter and longer-lasting floor system.

6. Less wastage onsite
As our metal web floor joists are made to measure, wastage onsite is almost eliminated.

7. Suitable for multi-occupancy buildings
The easi-joist® system also suits multi-occupancy buildings as it is manufactured to high acoustic and fire performance standards which benefits party floor construction and the strength built into the floors improves floor rigidity.

8. Suitable for roof and wall structures
Metal web joists and floor joist solutions can be used for roof structures via the easi-rafter® roofs system. easi-joists® have excellent spanning and load bearing capacity and so can be positioned at any angle between zero and 90 degrees. Metal web joists can be easily adapted to create pitched roof structures as a lighter, more thermally efficient solution.

Metal web joists can be used to create wall structures via the easi-panel® walls system. This system comprises of open web studs assembled from strength-graded timber flanges, plated together with precision-engineered metal webs.


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