Hi. Im in the middle of designing a chimney cap which I will build myself. I am making the top and bottom out of ready made galvanized steel trash can lids. (Reason: cheap!)
I"m concerned in my design whether or not I will need to support the center of the top to take more weight (from snow and ice) The manufacturer says that the lids are made from 28 - 30 guage steel. If the lid is 21" round and only supported at the edges, what is the weight limit?