We don't think it's a good idea to drill holes in something that should be fully watertight. Seems obvious, but that's how other roof systems work.

We sat down at the drawing board and thought of a stronger, weatherproof solution. All Global glazing bars have an internal bolt slot. There are no fixing holes through any glazing bars so it reduces leak potential and saves installation time.

A substantial M8 fixing bolt is fixed into the central groove. This bolt enables the rafter to hook directly into position. Nuts are then fixed easily from the inside, not in the drainage channels.