70mm Aluminium Window System Arrives

A modern apartment
Aluminium Windows

28 October saw the official launch of AluK’s brand new, beautifully engineered C70S 70mm window - the big brother to its iconic 58BW window system.

The C70S has all the clean lines, slim sightlines and advanced functionality which customers love about the 58BW but with increased weather performance and new design features for even faster fabrication and installation. Assembly is quicker, thanks to clip-together detailing on the sub cill, frame extenders, and Z adapter and a universal EPDM carrier groove means that the EPDM strip can be fitted reliably and easily every time using a simple, AluK-supplied ‘snap-in’ PVC profile.

Marketing Director Sioned Roberts says that the C70S will be the platform on which AluK builds an entire new range of 70mm products, giving customers the same benefits of system integration which they already enjoy with the 58BW.


 “This means fabricator customers can add the new system to their range without a significant increase in their stockholding and give themselves flexibility on project specifications - which will benefit installers when it comes to pricing.”

– Sioned Roberts 

Marketing Director, AluK


No frame reverser

For installers, the system allows for reversed glazing without the need for a frame reverser, making it ideal for glazing at height. It is available in a wide choice of configurations including side and top hung casements and TBT windows to suit almost any application.



The C70S meets and exceeds all the key thermal, acoustic and performance criteria laid down by commercial specifiers and opens up new opportunities for customers targeting both residential and commercial projects.

For instance, the C70S can achieve U-Values of between 1.1W/m2K with triple glazing and 1.3W/m2K with double glazing. However, it also comes with lots of options in terms of glazing and clever foam insulation strips which give fabricators the flexibility they need to be able to design U-Values either up or down to suit the specification of each project.


Weather and noise

The system also boasts class-leading wind (600Pa) and water tightness (1500Pa) performance, even with large span window openings and has the option of 50mm acoustic glazing, which means it can be used everywhere from exposed coastal settings to noisy city centre locations.



Both inward and opening windows have been successfully tested to PAS24 and accredited to SBD, ensuring that the C70S is suitable for all projects requiring Approved Document Q.



The C70S is available on five-day lead times from stock in white, grey, black and dual-colour white/grey and white/black options. Other colours and finishes are available to order.

Picture: AluK has launched C70S, its new versatile 70mm aluminium window system.


Article written by Cathryn Ellis
30th October 2020


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