When building a base for a shed, it is important to use pressure-treated wood. Pressure-treated wood is green in colour and is resistant to water. This will ensure the lumber will last through the seasons and will not rot the floor of your shed. Getting the most life out of shed is extremely valuable. Allow ample time to complete the process of building a shed base.
- Skill level:
- Moderately Challenging
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Things you need
- Pressure-treated wood
- Circular saw
- Tape measure
- Carpenter's level
- Concrete blocks
- Framing nails
- Framing square
Purchase the materials needed for the base of the shed. The material list will include two 4-by-4-by-8-inch treated pine boards for the skids, two 2-by-4-by-8-inch treated pine boards for the bands, seven 2-by-4-by-93-inch treated pine boards for the floor joists, two 4-by-8-inch pieces of plywood for the floor decking and four cement blocks.
Measure seven of the 2-by-4-by-8 boards at 93 inches and make a mark on each board with your pencil. At the 93-inch mark, use a framing square and square the 93-inch mark across the width of all seven of the 2-by-4 boards marked. Cut them all to size using a circular saw and position the 93-inch boards roughly 16 inches apart on the ground as these will make up the floor joists.
Position the 2-by-4-by-8 boards so they are standing up width ways along the ends of the floor joists. Square the end of the 2-by-4-by-8 boards with the end of the 2-by-4-by-93-inch board. Nail two framing nails through the face of the 8-foot board and into the end of the floor joist. Check the corner with a framing square to ensure the two boards have a perfect 90-degree corner and repeat for the other three corners until you have an 8-by-8-foot frame.
Make a mark at 16 inches, 32 inches, 48 inches, 64 inches and 80 inches on both sides of the shed base. Align the 93-inch floor joists on each mark and square the board using framers square. Flush the floor joist with the top of the base frame and nail two nails into each end of the floor joists on each side of the shed base.
Lay out the foundation of the shed base, using the cement blocks and the 4-by-4-by-8 treated boards. These will be the skids under the shed base, which will allow you to move or relocate the shed. Align the blocks on the ground so that they are 5 feet, 4 inches apart vertically and horizontally. Place the 4-by-4-by-8-foot skids on the top of the blocks straight and level. You may have to remove some top soil to level the blocks.
Lay the 8-by-8-foot frame on top of the skids, leaving you 16 inches outside of the shed base frame on all four sides. Using a tape measure, measure diagonally from one corner to the other corner and repeat for the other two corners. Both measurements should be the same if the base is square. If the base is not square, repeat until the base is square.
Nail through both sides of every floor joist securing the joists to the skids. Lay the two 4-by-8-foot sheets of plywood onto the top of the shed base. Nail the plywood onto the floor joists and outer frame while spacing your nails about 10 inches apart on every floor joist.
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