Designed for and with, UK fabricators and installers.

The Decalu88 Flush Casement.
The future in the making.

Our new casement window. Your growth.

Welcome Roy Frost

Our new casement window.

Your growth.

Developed over more than 18-months the Decalu88 Flush Casement is the aluminium window that you asked for.

Headline u-values of as low as 0.8w/m2k, redefine expectations of energy efficiency in an aluminium window system.

Stunning sightlines create a contemporary, minimalist and sophisticated, architectural aesthetic, defined by a flush finish between the sash and the frame.

Modular, pre-gasketed and marine-grade powder coated and dual colour as standard, the Decalu88 Flush Casement is pump-primed to make you money.

The Decalu88 Flush casement

Fabricator and installer checklist

NC88-PRZ-0003 a

Slim 88mm aluminium system with equal sightlines

Flush internally and externally

Patented thermal break

Minimum/max. glazing 12-52mm units

U-values of as low as 0.8w/m2k triple glazed – Future Homes ready

U-value of 1.2w/m2k with a centre pane u-value of 1.0w/m2k – newbuild double-glazed!

U-value of 1.4w/m2k with a unit with a ‘standard’ centre pane u-value of 1.2w/m2k.

Modular: common outer-frame vent and bead, lowering stock-holding

Making, manufacture of an energy-efficient aluminium window simple

The Decalu88 Flush Casement: U-values as low as 0.8w/m2k triple glazed and 1.2w/m2k

Passiv Haus window equivalent standards of performance

Decalu88Flush sets a new standard for energy efficiency in aluminium window systems.

This includes headline u-values of as low as 0.8w/m2k triple glazed –  that’s a Passive House, equivalent level of performance.

Part L newbuild compliance in a double-glazed aluminium window!

The even bigger wins for fabricators and installers are in the still impressive ranges of performance that the Decalu88 Flush Casement achieves double-glazed.

With a high performance patented thermal break, Decalu88 Flush gets down to u-values of as low as 1.2w/m2k with a centre pane u-value of 1.0w/m2k.

That’s a newbuild level of performance without having to go to a triple-glazed unit!

Comply with Part L requirements for home improvement with a standard glass spec.

The patented thermal break used in the Decalu88 Flush Casement means that it makes meeting Part L energy regs for home improvement a walk in the park.

There’s no need to move to a more expensive glass specification, you can achieve a Part L compliant home improvement u-value of 1.4w/m2k with a unit with a ‘standard’ centre pane u-value of 1.2w/m2k.

Installers are more competitive and fabricators win more business!

Take the tour

Product overview. The Decalu88 Flush Casement

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The Decalu88 Flush casement

Want to know more about the Decalu88 Flush Casement?

How low can you go?

Is your existing system ready for regulatory change in 2025?

Many  aluminium systems have struggled to meet the latest round of regulatory requirements for thermal efficiency under the revisions of Part L in June 2022.

But more change is coming around the corner! The expectation is that 2025 will deliver a further uplift in performance. Newbuild requirements could be as low as 0.8w/m2k under the new Future Homes Standard.

If you’re systems company struggled with Part L, it’s time to get in touch.

Find out how you can make a more energy efficient flush casement window as lower cost

Iteration 49.

The Decalu88 flush casement development story:

The Decalu88 Flush Casement has been developed by our UK design team and in partnership with our customers (and one or two key prospects).

As all great innovations should be, The Decalu88 Flush Casement is the product of a journey. The developmental project ‘Iteration49’ was named after the number of design changes and refinements we have made – yep, all 49 of them!

The late nights, the weeks, the months (the occasional dead ends), have fed into the product that we have today – and most importantly – one which will continue to deliver opportunity long into the future.

Understanding of requirement and attention to detail in design.

Find out about our journey so far - and where we can take you.

Fully tested, so your patience won’t be!

New window and door systems are great – we love them. But they can often come with wealth of frustrations attached as those small, niggly fabrication irritations are discovered.

That’s another reason why like a fine wine, Iteration49 has taken a while to mature into a great new aluminium system. It’s been put to the test in real manufacturing environments throughout its development, so there are no surprises.

In this case ‘new’ means ‘good’, not ‘get ready for a manufacturing headache.’

Big wins for installers

Don’t think for a moment that we’ve forgotten about installers. We haven’t. We know it’s not only about delivering products which are great to make, they have to be good to fit – and deliver on design.

Iteration49 is crammed full of installation efficiencies but also end-user appeal. We guarantee aesthetic appeal, but also next generation performance.

This includes setting the new standard for energy efficiency in an aluminium system with up to Passiv Haus equivalent levels of performance.

Iteration 49.

The Decalu88 flush casement development story:

The Decalu88 Flush Casement has been developed by our UK design team and in partnership with our customers (and one or two key prospects).

As all great innovations should be, The Decalu88 Flush Casement is the product of a journey. The developmental project ‘Iteration49’ was named after the number of design changes and refinements we have made – yep, all 49 of them!

The late nights, the weeks, the months (the occasional dead ends), have fed into the product that we have today – and most importantly – one which will continue to deliver opportunity long into the future.

Understanding of requirement and attention to detail in design.

Find out about our journey so far - and where we can take you.

Fully tested, so your patience won’t be!

New window and door systems are great – we love them. But they can often come with wealth of frustrations attached as those small, niggly fabrication irritations are discovered.

That’s another reason why like a fine wine, Iteration49 has taken a while to mature into a great new aluminium system. It’s been put to the test in real manufacturing environments throughout its development, so there are no surprises.

In this case ‘new’ means ‘good’, not ‘get ready for a manufacturing headache.’

Big wins for installers

Don’t think for a moment that we’ve forgotten about installers. We haven’t. We know it’s not only about delivering products which are great to make, they have to be good to fit – and deliver on design.

Iteration49 is crammed full of installation efficiencies but also end-user appeal. We guarantee aesthetic appeal, but also next generation performance.

This includes setting the new standard for energy efficiency in an aluminium system with up to Passiv Haus equivalent levels of performance.

The Decalu88 Flush casement

Want to know more about the Decalu88 Flush Casement?

Want to know more about the energy efficient replacement and commercial windows in our range?

Elegant and understated

The Decalu88 Standard Window

A timeless style with a completely flat exterior, the Decalu88 is highly flexible option and suitable for a wide range of applications.

Minimalist high-end architecture

The Decalu88 New Steel

The Decalu88 New Steel Window is defined by a contemporary high-end architectural aesthetic making it ideal for modern statement installations.

Minimalist high-end architecture

The Decalu88 Hidden

The ultimate in minimalist design, the opening window sash is completely hidden behind the frame in this modernist window designed to maximise light.

Modern and elegant design

The Decalu88 Open-out

This commercial window solution is available with automatic opening, making ideal for specifications including smoke venting.

Sculptured detailing and exceptional design flexibility

The Decalu94 Retro

The Decalu94 is a more traditional window option featuring classic detailing for period installations.

High rise and ultra-energy efficient solution

The Decalu101 Scand

This pivoting window rotates 160° for easy cleaning and maintenance, making it ideally suitable to applications where access is an issue.

Warehouse and industrial loft style

The Decalu110Steel

Inspired by the industrial trend, this window is perfect for contemporary statement builds.

The Decalu88 Aluminium Bi-folding Door

Fit an extra bi-fold a day.

Fitted in under two-hours and
glazed in less than four minutes*

*Three pane bifold