A public service announcement

brought to you by those who learned the hard way

The kind of twin wall polycarbonate sheet which is frequently used for the construction of greenhouses can be joined using a special I section extrusion and edged using a C section extrusion. If your hardware shop fails to supply this and you erect your construction without it you run the risk of this happening.

The extra photo is a little leggier and you may prefer not to look