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Hoogovens has developed kal-zipregistered throughout Europe for some 30 years, and not a lot has changed. It's good - so good, in fact, that many flatter us by copying the shape, but not the brand - it's a bit deeper than just a building sheet.

kal-zipregistered sits above the structural purlin by means of a thermally broken, patented spacer clip. The minimum cavity depth is 25mm, and it can go right up to 210mm, all to fill with insulation quilt or semi-solid slab. Despite that height and the sort of 'in-plane' of lateral forces that a kal-zipregistered sheet can place on the clip head, trying to overturn it, the stclip remains rigid. This allows the thermal movement generated by sheet lengths like the 117.5m ones on the Lidl Distribution Centre (also see page xii) to continue over the 40-years-plus life stated in our Agrement Certificate. The clip is rigid and kal-zipregistered slides smoothly, never locking up.

Some years ago in France, our customers wanted to lay kal-zipregistered over foam glass. Our st25 clip would have placed the kal-zipregistered 25mm above the insulation, leaving a cavity with the problem of providing a rigid transfer of the forces generated by expansion and contraction of the kal-zipregistered without causing cold bridging and lack of insulation continuity.

So, as we have crimp-curved, cranked, coloured, smooth curved, tapered, curved-tapered and multi-curved kal-zipregistered, we decided to create two more kal-zipregistereds: Baby kal-zipregistered (a story for the future) and kal-zipregistered af - a new product working in a totally different manner and giving a totally new appearance - especially when you see it in bright red on a wall laid at 45degrees pitch.

What did we do? Well, to come back to foam glass in France, we developed a brand-new sliding clip where the sheet and clip head slide within the clip foot so that there are no forces being exerted which will turn and lock on a carrier channel. We made the kal-zipregistered so that the clips sit inside the seam, thus increasing the strength so that no mini-strengthening ribs are required. This produces a clean, smooth, unbroken 'pan' which can sit flush on insulation materials like foam glass or Rockwool slab.

As kal-zipregistered af is self-supporting, we can use lighter, more economic gauges of metal. We can provide zinc aluminium material as kal-zipregistered af is visually similar in appearance to zinc widely used on the European mainland. We have created a whole new range of kal-systems for both new and refurbishment work with aluminium channels laid into semi-solid rock fire insulation, fixed with our new screws described elsewhere in the article.

The result is a brand-new appearance for the roof or the wall (whether industrial, commercial or domestic build) with all the proven qualities of our original kal-zipregistered. Our new system is more competitive due to its ability to be of lighter gauge when fully supported, and can be offered in full kal-kolor or zinc aluminium for a zinc appearance.

And what does af stand for? All Flat, of course.

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