They built a big arena in CT years ago. The roof was built on the ground, and then jacked up on 4 corner pillars. The massive roof was supposed to have about 4' of pitch (Why do they make roofs so flat?) but by the time they had the roof in place, it was virtually flat. Then they added the lights, video screens, and speakers hanging from the center of it! Along came about 10" of wet snow, followed by a heavy rain. The roof collapsed only hours after a basketball game. The security guard was blown out into the street by the wind it made.