General Advice on curved glass

General Advice

When contemplating using curved glass there are three main areas for your consideration.

  • Design
  • Framework
  • Practicalities


It is often a good idea to produce a scaled drawing showing the plan view, a front elevation view and if possible a 3D view showing the glass in situ. It is useful because early on you get a good idea of what the finished job will look like, thereby giving an opportunity to make any necessary changes. Areas to do with design, harmony and proportion along with possible handling issues can all be assessed at this stage.


Especially if there are curved frames being made specifically to take the curved glass, you need to ensure that both match correctly.

Usually when using Aluminium or PVC windows, the main concern is that the finished radius is correct and that the frame is not warped. When timber frames are being used, apart from the radius being correct, you need to specify that the rebate should be 20mm wide and deep enough to take the specified glass thickness.
e.g. – you need a 50mm deep rebate to take a 28mm thick d.g unit, the remaining space being taken up by the retaining bead. Also make sure that the retaining beads on any curved framework are on the outside and not on the inside.


An important part of design involves giving consideration to practical elements. For example, if you are building a concrete stairs, or if you are talking about large sized panels or even if you need to consider a shape which is not a true curve, we would encourage you to let us know your ideas first before committing to them. Irregular shapes for example are usually more expensive and a little thought can often bring about economical solutions.