Fill the piers with concrete, smooth the top with a trowel, then immediately push a zinc-galvanized post base down into the center of each pier. Step 7: Mix and Pour the ConcreteĪdd water to the pre-mixed concrete and mix until the ingredients are fully hydrated and smooth. level to ensure each one is perfectly plumb when backfilling around the tubes with soil. Stand the tubes into the holes, use a 4-ft. And, of course, the tops of all the tubes must be level with one another. Be sure each protrudes a minimum of 6 inches above grade. When necessary, cut the tubes to the proper height using a handsaw, jigsaw, or circular saw. Diameters range from about 6 to 36 inches, and the tubes are commonly available in lengths up to 12 feet. Step 5: Prepare the Fiber-Form Tubesįiber-form tubes, known by the trade name Sonotube, come in various sizes. Line the bottom of each hole with about 4 inches of gravel. Dig each hole about 2 inches wider than the fiber-form tubes. It is important to follow the code for your area concerning how deep the holes should be. Mark each intersection so you will know exactly where to dig each pier. Outline the perimeter of the shed using stakes and string. When you have everything you need beforehand, the project will be quicker and smoother. This could make a difference in the location of your shed. Where does water move and collect in your yard? Is the soil appropriate for a pier shed foundation? Although this may have already been determined in the planning phase, it is important to know what you want to use your shed for. If you live in a warm region with a very shallow frost line depth, dig the holes at least 24 inches deep. Step 2: Prepare the siteĬheck with the local building department for the frost line depth in your area. It is best to have too many piers than too few. (Check the building plan for specific information.) Larger sheds will need more piers, especially if you plan to store heavy equipment. You will need to know the size of your shed to determine its location and how many piers you will need. Planning is very important when building a concrete-pier foundation. It saves time and money, it can be used for any size shed–big or small–and because the piers extend down to the frost line, it meets the requirements of a permanent foundation. There are some benefits of this type of foundation. That way, the piers can be cut to extend above ground 6 to 12 inches. To simplify the process, the holes are first lined with round fiber-form tubes prior to pouring the concrete. A concrete-pier foundation consists of holes dug down to the frost line and then filled with poured concrete.
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