"Tony Bryer" wrote in message
...
On Wed, 20 Aug 2008 13:20:23 +0100 Dennis@home wrote :
My bay window has PVC coated steel tubes in the corners to support the
roof.
It can't cost much extra to do a proper support like this.

Very old page but a guy who knows his stuff

BAY WATCH - The Disaster Movie

Independent glazing consultant Philip Rougier examines the topical and
controversial subject of replacing timber bay windows with PVCu ones.

http://www.expertexpert.com/bays.htm

Mine have been in for about 15 years now so I think they did it correctly.
The poles are bigger than 40 mm too, about 65 mm.

The actual frames are reinforced too.