A shed base serves as the supporting surface for prefabricated or other small storage shed. The reasons for laying a foundation of this sort are to keep the shed floor level and to provide drainage so the area under and around the shed stays dry--this prevents decay of the shed structure and protects its contents. Creating a shed base requires some earth-moving and carpentry skills.
Things You'll Need
- Crushed rock or gravel
- 4- by 4-inch pressure-treated beams
- Carpenter's level
- Straight board
Excavate the sod and soil underneath the planned shed area with a shovel to a depth of at least 2 inches. Remove all grass roots as well as any other plant roots in the area.
Fill the excavated area with crushed stone. Rake the stone to spread it evenly until it looks level to the eye.
Lay down the 4- by 4-inch treated timbers. Use one timber for each 4 feet of shed width, and space the timbers evenly over the excavated area. Work the timber down into the crushed stone so it does not wobble. Check each timber with a carpenter's level. Add or remove crushed stone under the timbers to adjust if necessary until they are level.
Place a straight board over all timbers. Place the level on top of this board and check to ensure the timbers as a whole create a level surface. Adjust the timbers for horizontal level by adding or removing gravel under them as necessary. Remove the board.
Tips & Warnings
- Placing landscape fabric in the excavated area before the crushed rock is added prevents weeds and grass from growing up through the rock under and around the shed.
- For small projects bagged, crushed stone available at home improvement stores works well, but for larger projects having the stone delivered by a contractor may be most cost effective.
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