[Alastair Macnaughton]

Hello Alastair,

I think you are referring to the gap between the casement and the frame?  It needs to be the depth of the friction hinge stack height minus how much you house the friction hinge in by (1mm either side possibly).

Check the designs for fixed lights. If they don’t have drainage holes then why would you need them if you still have the same siliconed bead holding the external glazing in place?

 

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