I've had a metal framed 6ft x 4ft greenhouse for ~12 years now. During that time, many of the original glass panes which were supplied with the greenhouse (I could have opted for polycarbonate with this greenhouse) have been damaged mainly due to bad weather and the occasional football from over the fence. As glass prices have gone up considerably in my area, I've replaced the glass with 4mm thick polycarbonate sheeting panels. The standard ~2ft wide panels are held in place by rubber lined channels on the inside and W clips on the outside.
Normally everything is fine, however during the recent gale force winds the polycarbonate has been flexing, leading to one panel being completely blown out of the frame along with it's W clips when I opened the door.
As the polycarbonate isn't as rigid as the original glass, I was just wondering if anyone else has come up with a way of holding polycarbonate sheeting more rigidly within a greenhouse frame? Does anyone know if there are different clips available that are more suited to polycarbonate?
One idea I did think about would be to install some side battens, perhaps made of plastic and fasten these by drilling through the sides of the metal frame along the length of the panel.
Any ideas welcome!