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Hi there. The window frame size is NOT the opening size. With my Roto windows, the external frame size was 740wx980H. On the width you leave 35mm either side to allow for insulation...a must.....that is probably what the 40/60mm is with these windows. As for the height, this differs...

Hi there. I recently fitted 3no electric Roto roof windows in a new extension and gave careful consideration to where they should be placed. The first was an equal spacing across the span of the roof although I could have gone for a combination/bank of 3 or even 2 +1 if that makes sense. I...

Hi there. It may be a little late but have a look at the wedge style flashing with Roto Roof windows. This is ideal for this kind of situation as it tilts the window so it is greater than 15 degrees.