You’ll also need to determine what materials you’ll require, including the amount of concrete and size of the pier forms. 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. Additionally, you want to place the piers near the corners of the structure. A double 2×8 beam should be supported every 4 to 6 feet. Typically, the span between two piers is based on the dimensions of the beams and the joists. An 8 ft x 12 ft shed will need 6 piers, 3 per long side. This will help you determine the number of piers and their locations. Step 2 – Create Foundation Planīefore you begin digging, you need a foundation plan based on the dimensions of your shed. Your structure may have more support than it requires, but that’s not a bad thing! In fact, it can prevent the floor from bouncing and may allow you to store more weight inside your shed without damaging the structure. It’s better to have more piers instead of too few. So if you want to limit the number of piers, increase the size of the joists. Larger joists can carry more weight across longer spans. The size of the joists determines their strength, dictating how many piers you’ll need. The shed’s structure can also be a factor. Heavier objects mean you need more support, so a shed holding items like a riding lawn mower will need bigger piers than one holding basic garden tools. Second, the amount of weight you plan to store dictates the diameter of the piers. First, the size of the shed will determine the location and number of concrete posts. When you’re planning your pier foundation, two factors play a significant role. Considering you need to dig 6 inches deeper than the frost line, that’s a deep hole! Building a Pier Shed Foundation: Step by Step Step 1 – Planning for the Pier Foundation For example: in parts of Michigan, the frost line can be 40 inches deep, and in Anchorage, Alaska, the frost line can be 60 inches down. In contrast, if the soil is too soft, it may not provide the piers with enough support, allowing them to sink.Īdditionally, if the frost line is deep, you’re going to need to go deeper. If your ground is rocky, digging deep enough may be physically challenging. Since a concrete shed pier foundation requires you to dig below the frost line, you need to examine your yard before selecting this option. It creates a level foundation for your shed and prevents the moisture from contacting the wood floor or underlying supports. Since the shed foundation piers extend above the soil, it is an excellent choice if your terrain is uneven or if water tends to collect in the area. Where and Why to Use Concrete Shed Foundation PiersĪ pier shed foundation elevates the shed, keeping it from direct contact with the ground. Larger buildings may require more, depending on the span and the amount of weight to support. Typically, most sheds will need four posts, located near, but not necessarily at, each corner of the building. The shed is then attached to the wood posts, usually with steel connecting plates or post brackets.
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