The SkyLight Polycarbonate Storage shed is made up of extremely flexible plastic. The flooring is plastic and tends to raise in each and every section.Assembly will take three people. It’s extremely hard to stay up during assembly. When completely assembled it is extremely light. If you choose to purchase PLEASE bolt it to your flooring. It blew with the wind. It recently rained. Water came through the air vents and two parts of the sky roof. It was a nightmare. I followed each step and EVERY instruction. I’m regret my decision to purchase the skylight shed.