Photo: Ayman Zaki

How deep should my foundation be for shed?

Large shed footings should extend 12” below the frost line (meaning a depth of 24”, 36”, 48”, or more depending on the local climate).

siteprep.com - Shed Footings: The Complete Guide for 2022 - Site Prep

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Footing Requirements for a Shed

1. Footing Requirements by Shed Size

This may be the single most important shed footing factor. Many local governments in our region divide sheds into the following size categories:

Less than 100 square feet

Sheds under 100 sq ft (or 200 sq ft in some locations) often require no footers whatsoever. Very small sheds like these have a low risk of sinking or buckling. Even if they do, any harm caused is likely to be insignificant. (A shed foundation can still increase the longevity of a small shed; you can read more about whether your shed needs a foundation here.)

Between 100 and 600 square feet

Sheds in this range often do not require “frost-proof” foundations but may be required to have a stone pad or shallow footers at 12” deep. For example, 12×16 shed foundation footers may not be required, but some type of gravel shed foundation would likely be advisable.

Over 600 square feet

Larger sheds like these typically require “frost protection”, aka shed footings that extend below the local frost line. Some locales make an exception to the footer depth requirement if the building is placed on a concrete slab.

2. Footing Requirements by Shed Wall Height

Height is another significant factor as it helps to determine how much weight the shed footers will be supporting per square foot. Note that for these purposes, shed heights are typically measured at the wall (or “eave”) height rather than the height at the roof peak. Sheds are often divided by height as follows:

Less than 10’ high

Sheds with walls under 10’ (or 12’ in some locales) may not require footings of any kind (although this is usually tied to a square footage requirement as well). If the shed includes a built-in floor, some municipalities allow them to be placed directly on a gravel pad.

Over 10’ high

Sheds over 10’ in height (or 12’ in some municipalities) often require footings of some type. Additionally, the local government may require both a zoning and construction permit for accessory buildings of this size. For example, barn shed footings would likely be required if the building contains a loft area or a second story.

3. Footing Requirements by Shed Utilities

Footings may be required if a building will be connected to any type of utility service. This includes electric, gas, oil, and/or sewer. In the photo above, an electrical conduit was installed as part of the shed footing/shed foundation installation; it will be connected to the shed when it is delivered. A utility connection can also affect whether a construction permit is required for the shed. This makes sense since the repercussions of a sinking shed are greater if it also runs the risk of rupturing or exposing a utility line.

4. Footing Requirements by Shed Use

If a shed will be used for habitation or any other human activity, shed footings may be required. In at least one case, a township noted that frost-depth shed footings were not required if “the building presents a low hazard to human life in the event of failure”. So if someone asks whether footers are necessary for an implement shed, the likely answer is “no”. However, shed footings are a good idea if an outbuilding will be used as a workshop, she shed, or office (as shown above). Here are links to shed footing regulations from several municipalities that you can refer to for ideas of what the typical requirements look like:

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How often should you oil a shed?

To extend the life of the preservative and offer the structure better weather protection, we recommend the use of an exterior wood oil to seal in the preserver. The oil top-coat can then be replenished as and when required, usually every year or 2 depending on the amount of weathering that the shed is exposed to.

wood-finishes-direct.com - Shed Treatment FAQ's - Wood Finishes Direct

Our advice on how to waterproof a shed, especially a new shed is to treat all exterior facing sides and panel edges with 2 coats of an exterior wood preservative, followed by 2 coats of an exterior wood oil prior to the shed being constructed. Older sheds or sheds that have recently been constructed should first be cleaned with a wood cleaner such as Barrettine Mould and Mildew Cleaner. This is to remove and kill off any mould, mildew or algae spores that are either on the surface or in the surface of the wood fibres. once this has been done, treat all visible surfaces as above with 2 coats of an exterior wood preserver followed by 2 coats of an exterior wood oil suitable for sheds or a decking oil. This will provide an excellent weather protective finish that can be easily maintained year after year by simply applying a maintenance coat of wood oil. An alternative to the above is to use a high quality exterior wood paint or an Exterior wood varnish.

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