How to Make a Gravel Shed Base

gray gravel
What You'll Need
Garden spade or excavator
1-by-6 inch planks
4-by-4 inch timber
Ground membrane

A dry, solid shed base is important to the foundational structure of any well-built shed. While these outdoor spaces provide a fantastic place to store tools, garden products, children’s bicycles, and more, sheds can let moisture in and ruin your things if you don’t install the correct type of base. While there are other types of bases you can install that are more permanent, you can install a waterproof, gravel base with the guide below.

Digging Out

Digging out the hole correctly is a vital stage in creating a shed base. Dig a hole to a depth of at least 6-inches. Then, attach a piece of string to two pencils to find out if your excavated base if level. Insert a pencil at each side of the hole, 6-inches down, and remove any surplus soil that sits above the string, until the base is level.

Try to dig out at least 6-inches beyond the boundaries of the shed to allow for an extra area of dry ground around all the outer surface of the finished shed.

Fitting Planks

Using assorted 1-by-6 inch planks, pack the sides of the excavated area, so that they fit snugly into a rectangular shape. This lumber will create a barrier that will stop dirt from caving back into the hole, and it will also help to keep the gravel base in place.

Laying a Membrane

Next, lay a membrane to sit over the exposed earth. Shape and cut the membrane to fill the area within the sides of the hole. The size will depend on the specific size of the hole you dug, but it should be slightly oversized so that the surplus on each side can be nailed or stapled to the wooden planks to keep the membrane in place. This membrane will create another barrier between the gravel and the ground, to prevent moisture from seeping into the gravel and reaching the wood.

Pouring the Gravel

Now, pour the gravel into the excavated area. Add enough gravel so that it sits just below ground level, with about 4 inches to spare. Pour the gravel slowly to avoid dislodging the membrane. Then, level the gravel with a garden rake.

Adding Timber

Lay the 4-by-4 inch timber on top of the gravel, approximately 6-inches apart across the longest part of the excavated hole. Add enough lengths of timber so that the area is evenly covered. Now, you can build your shed with confidence because your gravel shed base is waterproof and sturdy.