I remember a few years ago when my uncle was clearing his allotment and offered my mum his 12 x 8 greenhouse only problem was he had made sure it could stand up to anything mother nature threw at it. It was your bog standard ally frame but he had glazed it with double wall polycarb for the sides and triple wall for the roof which was all siliconed and clipped and extra braces added to the side walls so it had to be moved in one lift so we had to get dads van backed up as far as we could and then three of us carried it to the van it only just sat on because of the width, with few scaffold boards and straps later we was on our way to its new home on the veg patch at mum and dads it was laid to rest were still i to this day