Sieger Slim HD Casement

Enhanced Performance, Enhanced Design


The HD version of our slim casement window offers larger opening sizes, more opening options (including tilt and turn windows) an improved performance. The Slim HD casement window is a great choice for opening or fixed windows to new build developments or high specification renovation projects. The square edged thermally broken aluminium profile maintains a modern design to your glazing and is available to be powder coated in any RAL colour. 

Sightline: typically 75mm across vent and frame

Thermal Insulation: Uw values from 1.2 W/m2K

Security: PAS 24 Certified 

Max Window Sizeside hung windows 900mm wide / 1800mm tall, top hung windows 1800mm wide / 1800mm tall, tilt and turn windows 1400mm wide / 2400mm tall. See the product data sheet for more. 

Configurations: side hung windows, top hung windows, fixed windows, tilt and turn windows, bottom hung windows

Glass Specification: glass thickness 23-40mm, double glazing with low e coating and argon gas filling

Weather Protection: full testing completed, air (4), wind (2400 Pa), water (9A)

The HD casement option from Sieger has an increased profile depth which allows for the creation of larger opening sizes. The openings possible with this aluminium window are truly impressive with opening windows available up to 2.5m tall or 1.7m wide.

With an increased glazing depth possible you can upgrade the system to include triple glazing. This will create a much higher level of thermal insulation for your project and is a suitable choice for developments looking to achieve specific or elevated levels of thermal insulation.

As with all our aluminium systems, you can powder coat the profiles in any RAL colour of your choosing. In addition, we have a number of specialist framing finishes that are available including timber look finishes and specialist metallic coatings, all offering a unique design.

See These at the Showroom

Come to the Sieger Showroom to see these aluminium windows in person. Just click the link at the bottom of the page to request an appointment or call the team who would be happy to help.

Request a Quotation

We would be happy to create a quotation for your project requirements. Click the link at the bottom of the page to request a quotation or speak to a member of the team to run through your specific project requirements. We can help tailor your glass package to ensure you achieve the design, performance and budget requirements for your project.

Visit our Showroom

The Sky House Design Centre

We are here to help. Contact us for Quotations, Technical Information, General Information and more.

Our factory is fully open for fabrication and supply only orders.

Our showroom in Amersham is currently closed to visitors due to lockdown restrictions. We plan to reopen our showroom to visitors from Monday 12th April along with other non-essential retail.

The Sieger Showroom has been deemed a Covid secure workplace and we have multiple rules in place to keep both visitors and staff safe. 

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