Secondary glazing can be fitted to almost any window reveal, thanks to a range of clever fixing methods developed by Selectaglaze.
Window openings are rarely uniform on all sides, so we create bespoke timber subframes to achieve a close fit to the opening and provide a plumb edge for our secondary glazing frames to sit against.
Our aluminium frames, also custom-built, can be finished in polyester powder paint in a wide range of RAL colours and finishes, including flat, metallic, textured and wood-grain effects. This helps the secondary glazing sit discreetly against the primary window and can, in many cases, even enhance its appearance.
Explore our gallery of secondary glazing installations across a range of window types.
If you'd like to see how we would approach your project, speak to our technical sales team.
Regular fix: a straightforward fit
The regular fix is the most common fixing method and is used for windows with a square reveal. Square reveals have defined edges, providing greater flexibility in positioning the secondary glazing. This often makes it easier to adjust the cavity size to suit the requirements of the project. A smaller cavity creates a more discreet appearance, while a larger cavity is preferable for noise reduction. Of the three methods, the regular fix is the easiest to measure and fit and uses the least timber.
Splayed fix: angling for more light
A splayed fix is used when a window's reveal is splayed rather than square. Splayed reveals are a design feature used to increase the amount of light entering a room. Because a splayed reveal is more likely to be asymmetrical, it's even more important that the timber subframe is measured and shaped to match. A splayed reveal means more timber is needed to create the fixing edge, so more of that timber is visible along the front edge of the secondary glazing when seen from inside. The available space within the reveal also influences where the unit sits and the cavity width achievable.
Face fix: at face value
A face fix is used when there isn't a suitable window reveal for the secondary glazing to fit into, so the frame must be fitted to the face of the wall. Here, we create what is essentially a picture frame on the wall, with the timber shaped to help the installation feel like a part of the window. This is most commonly seen with sash windows that sit flush against the internal face of the wall, or where the primary window opens inwards through the secondary glazing. Partial face fixes are also common. For example, where there is no suitable sill, the timber subframe is fitted to the face of the wall at the base, while the sides and head are fixed to the reveal. This also provides an opportunity to make the timber subframe a purposeful design feature, with a rounded edge, chamfer or other detail. The main consideration is how far the secondary glazing projects into the room. However, when carefully designed, the timber subframe can become a genuine design feature.
Whichever fixing method suits your window, the goal is the same: the right balance of space, performance and a discreet finish. Speak to our technical sales team to find out which approach is right for your project.