How deep should a shed slab be?

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 2023 - 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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What side of OSB should face up?

Answer. OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up.

osb.westfraser.com - Which way should you install OSB on a roof? - West Fraser

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Which way should my OSB roof board’s be installed?

Answer

OSB roof panels should always be installed with the grade stamp facing into the attic and the screened surface (with the nail guide lines) facing up. When the grade stamp is covered by roofing, the building inspector will not be able to confirm that the correct OSB roofing panel was used. The screened surface also provides a little more traction for construction workers during installation. The same goes for wall sheathing and flooring panels; always install with the grade stamp up so that inspectors can do their jobs easily. Having said that, it is very important that the sheathing be installed with the strength axis perpendicular to the trusses/rafters. The strength axis is usually the long direction of the panel but the grade stamp will indicate it. Be very careful on hip roofs along the hip to make sure the strength axis does not mistakenly get parallel to the supports as that may result in the panel exceeding the maximum span allowed for that thickness. Sagging may result if panels are installed incorrectly.

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