foundation for garden shed

Old 08-11-08, 07:38 AM
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foundation for garden shed

I am in the planning stages of putting an 8' x 8' wood shed and was wondering what the best foundation is for the shed to sit on. Concrete slab or pressure treated wood with plywood flooring? Any opinions?
Old 08-11-08, 02:57 PM
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There are advantages to both, but it usually comes down to preference.

Do you ever foresee moving the shed? If so, definitely go with a wood foundation.

Do you plan on storing heavy equipment, riding mower, etc.? You may want to consider concrete slab - otherwise you have to include a ramp to get to the door.

If you question how strong a wood foundation is - my dad has a photo of his Ford F150 extended cab 4x4 parked on top of a wood foundation built on 2 skids, using 2x6 floor joists, and 3/4" tongue and groove plywood.

Here's an excerpt from an article I recently wrote:
Either way you choose your new unit will still serve its purpose. A wood foundation (beneath the flooring) should use pressure treated lumber (aka. Osmose, Yellawood, ACQ, etc.) which will avoid rot due to moisture. Start your foundation by laying out 2 or more skids, which could be 4x4, 6x6, or simply nail 2 2x6's together. The purpose of the skids is to keep your wood foundation off the ground so no moisture is directly on your building. It also makes your shed portable, should you ever decide to move it. Use bricks or blocks underneath the skids to level your shed floor. This also serves to keep your entire building from coming in direct contact with moisture from the ground.

The foundation should then be attached to the skids using 2x4's or 2x6's, depending on the size of the building and the amount of weight you intend to store in your shed. Lay out your 2x4's or 2x6's every 2' measured to the center of the boards. Then you can apply your flooring. For maximum strength a 3/4" tongue and groove plywood provides a very strong foundation.

As mentioned before, building your shed on a concrete slab makes it a permanent fixture, so be sure of your location choice. Concrete slabs provide the strongest and most durable foundations capable of supporting endless amounts of weight. Be sure when attaching your walls to the slab that the bottom plate (board beneath the studs that attaches to the slab) is treated lumber. Concrete can hold some moisture so you want moisture resistant lumber used at the source. The rest of the lumber for the framework do not have to be treated.

Hope this helps.

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