I don’t know how big your sheds will be, but if they’re 10 feet by 12 feet in size or smaller, you can pour a concrete slab with ease under the following conditions: First, if the concrete ...

Pro tip: Your concrete slab will last longer ... which is perfect for most garages and sheds, 2×12 boards work best. For a driveway or other slab without thickened edges, use 2x6s.