To build a pier shed foundation you�ll need to determine the right number of piers, mark the pier locations, dig or drill the holes, place the sonotubes, and fill them with concrete. the last step is to add bent anchor bolts or galvanized post base before the concrete sets.. Shed pier foundation enabling a shed to be built on a steep slope installing pier foundations. you must first do a bit of excavation to level up the ground at the location of each pier. the exact location of the piers is dependant on the size and layout of the floor beams.. I think piers may be over kill, but your "shed" shounds more like a single car garage size. i would make your base as flex free as possible, just say no to the bounce. we framed both with 14" oc and minimum 1/2" ply..
Also it would pay to build in a damp proof course (some bitumen or heavy duty pvc) into the piers to stop damp rising up from the ground and into the shed base timbers. as you have found out timber and water will lead to early decay. however if this is the only space that you can fit a shed in your garden then you just have to make the best of it.. A foundation is the most important aspect of your project since the whole project rests on it (pun intended). there a few different types of foundations, some will be referenced and described.this article will hopefully help educate you and explain how to build a shed foundation with deck blocks.. 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..
