A concrete pier foundation features a series of concrete piers sunk below the frost line and supporting treated wood posts above the ground. Having trouble building a shed base. You want to make sure your holes are approximately 2 inches larger in diameter than your form tubes. You can recess the piers slightly from the corners of your shed, though typically no more than about 2 inches in from the end of the beam. A 2×8 joist can normally span 8 feet. Your outbuilding wonât contact the ground and will be more stable, making it worth the effort. We scrutinized several methods for building a cost effective, easy to build and rock solid cabin foundation for our 20ft x 24ft cabin. The easiest way to determine the size of shed you need is to consider what you want to store in your shed. This varies depending on the size of your shed and the piers, so youâll need to calculate this for your specific project. Once you reach the top of the form, insert two Â½â x 48â rebar into the pier. Regularly check to make sure your corners are square. My brother told me that the sonotubes help condense the cement and "holds the cement together" vs just digging a hole. Once the wooden posts are attached, you can make adjustments during the shed installation phase by cutting the treated posts to the proper length to create a level surface. Overall the use of sonotubes should save you a lot of time and effort rather trying to level the site and give you better access beneath the floor should you want to install plumbing, wiring or insulation. While creating a pier shed foundation is a large undertaking, it does prolong the life of your shed. You can also check state resources, such as your local Department of Natural Resources or a similar agency, for details about the frost line. The piers will be 16 inches long by 16 inches wide and what ever height you have determined you want. Joists that span 8 feet are acceptable but may experience some bounce. Topic by Beginningwoodworker: posted 11-07-2011 09:15 PM: 5283 views: 0 times favorited: 10 replies: Beginningwoodworker. Keep in mind that, once placed in the holes, the sonotubes need to reach approximately 6 inches above grade, so make sure you donât cut them too short. For each pier 12â x 48â pier, youâll need just shy of five 80 lb. Figure out how many forms you need. Before you begin any work on your concrete pier foundation, you need to determine if you need a permit. Often, you can find them available in standard sizes, like 12â x 48â. If you move slowly, this is less likely to happen. When youâre planning your pier foundation, two factors play a significant role. Determine the size of your foundation. Creating a concrete pier foundation takes time and patience (especially as the concrete cures). Place a plastic shield, like a tarp, over the posts, and pin it down with cement blocks or timber. Moisture from grass can seep into the tubes and damaging them. How Much Does a Concrete Pier Foundation Cost. « back to Exterior Home Improvement forum. You have a few options for digging the holes for the concrete piers. After each sonotube is level and properly aligned, backfill the extra space surrounding the tube. Concrete piers for sheds may be necessary if the shed site has considerable slope. Set all four corner blocks of the pier foundation first. Slide a sonotube in to form it up. Add 4 to 6 inches of gravel to the bottom of the hole and tamp it down. There are several different types of shed foundations, but they can be divided into just two categories: on-grade and frost-proof. This gives you room to adjust them. It made it easier to level the blocks. A double 2×8 beam should be supported every 4 to 6 feet. First, the size of the shed will determine the location and number of concrete posts. 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