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Window frame

Why are window frames important?

Although they may look simple, windows frames are constructed from purpose-designed materials and internal elements. They play a central role in creating a sturdy structure for windows and doors alike and must hold the glazing, sash, and fittings firmly in place. Visible from both the interior and exterior, frames are also highly customisable and can impact final design.

Different window frame materials

Frames for windows and doors can come in a range of different materials. Each affords the product slightly different properties.

uPVC windows, for example, are made from a particularly modern material with integrated air-filled chambers that provides excellent thermal insulation. Their sleek surfaces then also make for impressively low maintenance and easy cleaning.

Aluminium windows or external metal clad uPVC-alu or wood-alu frames, on the other hand, are renowned for their impressive durability and weather resistance. The anodised aluminium won't rust and is particularly impact-resistant, helping to improve security and strengthen the window.

For those after a softer touch, wooden framed windows with unique patterns add beautiful charm and style while bringing a natural sturdiness and density. As with uPVC and aluminium or composite clad framed windows and doors, at windows24.com wood windows can come in a range of different colours and finishes.

Internal frame construction

Window frames are not merely constructed from a single piece of dense material. Quality modern frames for windows and French doors feature intricately engineered structures.

Taking one of our most energy-saving profiles, the Aluplast energeto 8000ED, as an example, a glass seal, glass strip, and sealing levels can be seen.

In terms of the multiple sealing levels, these are the points where the sash is touching the frame when the window is closed.

They ensure a watertight seal between the two elements while also helping to reduce heat loss.

The glass seal and strip then work in a similar way but this time a tight fit between the glass and sash is ensured along with the necessary high contact pressure.

To achieve its impressive thermal insulation, the energeto 8000ED uPVC window frame and sash then also feature insulating foam, carbon fibre reinforcement and chambers. While the chambers divide the profile, trapping air and make it harder for heat to be conducted, the insulating foam further boosts this function by adding padding to the larger spaces. Using a carbon fibre reinforcement rather than a traditional steel one then also works to reduce the profile's conductivity, preventing energy loss while still creating a sturdy structure.

Security fittings and openings

How exactly frames are attached to glazing or an openable sash and which fittings they feature will depend on their opening mechanism. A standard fixed window, for example, will commonly have double or triple glazing attached directly to the frame and limited fittings.

A tilt and turn casement window, on the other hand, has glazing encased in an openable sash. This sash is then attached to the frame via upper scissors that allow it to tilt inwardly ajar. The frame then also features mushroom pins, striking plates, and further fittings that ensure secure locking via the handle and allow the window to turn fully open.

For customers after enhance break-in protection for openable tilt-only or tilt and turn windows, at windows24.com an increased number of frame locking points can be selected in our configurator. Along with laminated safety glass featuring invisible PVB foil interlayers, this can have windows achieve high, police-recommended burglary resistance classes like RC2.

Applying colour to customise design

Alongside tailoring casement window security and determining the frame's material, at windows24.com customers can create bespoke products by selecting the desired surface finish for the frame. The exact range of colours on offer differs depending on the frame's standard material but all tones are professionally applied during manufacturing.

uPVC windows, for example, can feature innovative new coatings, aluplast's aludec or woodec, that have the frame authentically resemble a timber or metallic surface in both its look and texture. The modern, insulating features of uPVC are retained, however, in the core beneath. More standard tones, such as classic white or contemporary anthracite are then also available. All are applied in a foiling process under high temperatures to ensure lasting vibrance and a quality finish.

When it comes to perfecting the style of aluminium windows or the external cladding of composite frames, these can also feature a wide range of colours from bright white to a deep moss green and many more. Applied through anodising and powder coating the metal, a lasting finish is also ensured.

For those after a wooden window, the largest range of RAL colours are then available. The frame can come in different timbers and feature a water-based varnish, for instance, or the desired tone for a paint can be selected in the configurator and will be added during manufacturing.

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