A metal shed holds no special requirements for the base. The only thing to remember is to avoid leaving treated lumber in contact with the metal to avoid premature ageing of the metal. A basic wood frame with treated lumber covered with exterior-grade, untreated plywood achieves a stable and solid floor without creating a negative impact on the metal. Constructing the base follows the same procedures as building frames for walls or floors inside of a house.
- Skill level:
- Moderately Easy
Things you need
- 2-inch-by-6-inch beams
- 3/4-inch plywood sheets
- Measuring tape
- Circular saw
- 3-inch self-tapping, exterior wood screws
- Screwdriver drill bit
- Concrete blocks
Measure the length and width of the shed along the lower edges of the shed. Cut two 2-inch-by-6-inch wood beams to the length measurement with a circular saw, and two additional beams to the width measurement minus three inches.
Assemble the wood beams into a basic box frame with each 6-inch edge standing vertically. The ends of the width beams will sit inside the edges of the length beams. Drive 3-inch screws through the length beams into the ends of the width beams to create the box shape.
Mark the inside edge of each length beam every 16 inches to create pairs of marks on opposing beams. The final pair of marks will possibly sit closer than 16 inches from one end.
Cut additional wood beams to the measurement for the width of the shed minus three inches. Attach one beam for every pair of marks with 3-inch screws driven through the length beams into the ends of the width beams to complete the frame assembly.
Place plywood on top of the assembled frame until the frame is fully covered. Secure the plywood to the frame with 3-inch screws placed along each length and width beam spaced every 8 inches. Cut excess plywood off flush with the exterior edge of the frame with a circular saw.
Lay out concrete blocks spaced every 3 to 4 feet for the support of the shed. Place a spare beam across the blocks with a level on top of the beam to gauge front to back and side to side level. Adjust the height of the blocks as needed by digging out beneath the blocks or adding more blocks.
Place the floor on top of the blocks. Place the shed on the floor. Anchor the shed to the floor with 3-inch screws driven through the base edge of the shed into the floor joists.
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