Under current EC5 standards, Deflection Limits are based on product capability, replacing the British Standards, where fixed limits applied to floor joists and attic trusses.

This gives us the flexibility to help our customer improve their product and reduce aftercare costs by engineering issues out pre-production.

Designing to the maximum deflection limits of joists can result in noisy floors, low house-buyer satisfaction and high aftercare costs.

However, value engineering is at the centre of the Robinson Manufacturing operation, and we work with our customers individually to understand how far they want their floors to deflect. We then tailor their design accordingly, using reduced centres and larger section sizes where appropriate to produce the required quality of floors.

So while choosing to be limited only by the deflection limits of the product can result in the lowest joist costs, where quality matters, setting smaller deflection limits result in sturdier floors with less noise caused by friction between sole plates.

EC5 standards

Weighing up the quality vs cost equation is not just as simple as looking at product costs; client satisfaction and aftercare costs need to be considered too – one major national player has just spent £12k resolving one squeaky floor!

A house-buyer who can walk around upstairs in their new home without being heard downstairs is likely to be a happier customer, more likely to recommend a builder’s houses and even repeat purchase for their next move. And, of course, less likely to call repeatedly on aftercare teams to resolve those noisy floors.