Level the ground (if necessary) and install deck piers along a grid to support the shed. the piers will allow you to string support beams beneath the floor of the shed. in the example design, the piers are spaced 6 feet (1.8 m) apart in one direction and 4 feet (1.2 m) apart in the other for a total grid area of 12 x 8 feet.. Custom shed frames. we specialise in designing, drawing and manufacturing steel shed frames for domestic, commercial and rural markets. we offer a versatile range of durable shed options with customer satisfaction as our goal..