Use a hand tamper to compact the gravel and then place the block on top of it. We recommend using 2-3” of gravel to cover the dirt. Tip: Please remove the grass under each solid-concrete block to present soil erosion.

There are also 2-inch-thick blocks, called patio blocks, which can be set on top of the thicker blocks when it’s necessary to raise one block even with the others. The blocks most commonly used for on-grade foundations measure 4-inch thick x 8-inch wide x 16 inches long. Over time, they can crack and crumble due to the weight of your shed. Important: Do not use hollow wall blocks. The size of your shed and the lumber being used for the floor joists will determine how many blocks you need and how much space will be between them. They should be laid out in straight rows, evenly spaced from each other. Concrete Block Solid-concrete blocks foundation for 10×12 shedĪ series of solid-concrete blocks are used to build this type of foundation. You would choose one of these if you have a small to medium-sized shed, if you may want to move your shed at some point or if you cannot dig into the ground. It can be a solid-concrete block, skid, or timber-frame foundation. On-Grade FoundationsĪn on-grade foundation is one that sits on the ground. Frost-proof foundations are ideal-and often code required-for larger sheds. But you can also create one with pole-barn construction, which uses a series of tall round poles or square posts set into deep holes. Frost-proof foundations are usually made by pouring concrete footings, piers, or a monolithic slab. While this type of foundation can be built virtually anywhere, it works well in areas where the weather is colder and that experience frost heave. For that reason, frost-proof foundations are often called permanent foundations. On-grade foundations are sufficient for most small to medium-size sheds.įrost-proof foundations present more building challenges than on-grade types, but they’re much stronger and longer-lasting. It is not necessary to dig any holes or pour concrete for this foundation type. One of their benefits is that they are quick and easy to build.

There are several different types of shed foundations, but they can be divided into just two categories: on-grade and frost-proof.Īnother name for an on-grade foundation is a floating foundation. Let’s take a look at the best foundation options for your shed. Therefore, building a strong, durable foundation is arguably the most critical step in building your shed. Even the best-designed, strongest-built sheds won’t last very long if set upon a weak or poorly constructed base. The success or failure of your shed relies greatly upon its foundation.

12x12 floating foundation deck plans