Selectaglaze secondary glazing systems have been designed with a flange, also known as an odd-leg, which aids in the seamless installation into reveals which have been squared off with bespoke timber grounds. This works perfectly when the window being treated is flat, but how can it be installed when a unit has been curved on plan?
When you curve the aluminium extrusion with the flange, it makes the back of the window larger than the front. This makes the standard installation impossible if a timber ground is fitted into the reveal first, as it will reduce the clearance for the back of the frame to slot into place for fixing.
Standard detail VS curved on plan - Series 25
In a recent treatment we were required to add secondary glazing to a Georgian curved on plan traditional sliding box sash window. Facing onto a busy main road the window not only did little by way of thermal insulation, but also let the distracting noise of passing tourists and traffic enter.
With a few ways of treating a window of this style; Selectaglaze presented the options:
- The secondary glazing could be faceted across the window, which would provide an upgrade in the thermal performance and noise insulation, but not follow the exact lines of the original window
- Use a curved on plan inward opening casement or fixed light unit, which would follow the lines of the window but if a casement; would impede on some of the space in the office as and when opened for ventilation
- To install the newly developed Series 25 vertical sliding curved on plan unit, which would mimic the operation and sightlines of the primary window, like for like
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