I'm planning on building a simple garden shed and a larger workshop out of concrete block and I'm curious about how I should plan/install a roof. I'd like them both to be flat to match the garage that'll be next to. I'm going to be stuccoing the outside walls of the block to match the garage as well. Never built a roof before, would appreciate any advice. Shed will be about 8'x10' and the workshop will be around 10'x15' with 4" thick block walls. Both are gonna be simple rectangles. Both will be built on top of at least a 4" poured concrete foundation. Thanks.