Floor Joists

Our FLOOR products

Floor Joists

Metal web joists compromise of an upper and lower timber member, connected by a steel web that provides strength. This results in a strong and light-weight joist solution.

The crowning glory of the metal web joist is most certainly the service void. No other product on the market offers the unique ability to have a void within the floor zone. Cables, pipes, waste pipes, ducting and more can thread within the floor zone with no requirement for cutting, notching or drilling. The upshot of this is in a time saving which vastly reduces the labour time on site, resulting in lower labour costs and a quicker build programme.

Made to measure floor joists

As a bespoke designed item, our designers ensure the floor joists are manufactured to the exact sizes required. Combined with our site measuring service, you can be sure our floor joists will drop effortlessly into place, giving you peace of mind.
Further to this, our CAD and laser-guided saw output and manufacturing jig set-up ensures accuracy on every single joist that we produce.

Read more about our cutting edge laser-guided technology on our blog.

Floor performance

Like all engineered products, there are design codes or standards that all products must follow. With floor joists, the most relevant to performance is the maximum amount of deflection (bend) the floor is allowed.

For a floor to conform with the design standard, the floor joists must not deflect more than 14mm. This deflection can be noticeable as you walk across a floor, in the bounce that you feel under your feet – the bouncier the floor, the closer to the upper deflection limit the joists will be.

Many manufacturers will design as close to this limit as possible as this uses shallow and/or narrower joists. Less material going into the joist means a cheaper product overall, allowing them to offer eye-catching low prices.

Here at ETS, we firmly believe that the lifetime performance of the product is more critical than merely generating sales. Quite simply, the lower the deflection is, the firmer the floor feels, and the floor ‘bounce’ is reduced.

Our designers will always ask you about the level of deflection and label clearly on the drawing what the degree of deflection is on our design. Wherever possible, and unless advised otherwise, we will ‘over-engineer’ our floor joists to provide a higher quality product.

Aren’t metal web floor joists expensive?

“But they’re more expensive than the I-beams aren’t they?” This is such a common misconception of metal web joists when compared to alternative products, such as I-beams.

It’s something we get asked daily.

Metal web joists are far stronger than I beams or solid timber floors. As a result, they either span the same distance in a shallower depth or span distances which other products would be unable to achieve. What this ultimately boils down to is usually one of the following:

  • Smaller depth joists, which can be important when floor to ceiling heights are at a premium, or when building an extension and existing floor depths need to match to avoid a step in the ceiling, without compromising on floor deflection.
  • Joists that clear span without the need for internal supports, removing the need for internal load-bearing walls or steel beams. The associated labour, groundworks and material costs of eliminating these walls and or steel beams can have a drastic effect on the overall build costs.

So if you’re looking at simple linear metre costs then be aware of all these factors. You’ll find the metal web joist to be very cost-effective, and if you’re not sure, then please contact our team on 01952 771170, email us at sales@etstrusses.co.uk or  use the request a quote page.

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