How to Build a Floor for a Metal Storage Shed


Metal storage sheds are inexpensive options for quality, outdoor storage. Most units are sold in pieces for assembly on site without flooring included. The floors are built on site or the sheds are erected onto existing support structures, such as a cement pad. Permanent sheds benefit from erecting a cement pad, but then the shed is restricted from being relocated. An ideal floor involves building a wood frame floor covered in treated plywood and supported with cement blocks, which allows for the shed to be relocated as needed while remaining stable and secure.

Things You'll Need

  • 2-inch by 6-inch beams
  • 3/4-inch plywood sheets
  • Measuring tape
  • Circular saw
  • 3-inch self-tapping, exterior wood screws
  • Drill
  • Screwdriver drill bit
  • Concrete blocks
  • Measure the length and width of the shed. Cut two 2-inch by 6-inch wood beams to the length measurement and two additional beams to the width measurement minus 3 inches. Cut all the beams with a circular saw or similar tool.

  • Assemble the four beams into a box layout with all the 6-inch edges standing vertically. Connect the ends of the width beams to the inside edges of the length beams. Drive two 3-inch, self-tapping, exterior grade screws through the exterior edges of the length beams into each end of the width beams to create the box form.

  • Measure and place a vertical mark on each length beam every 16 inches from one end, creating matching pairs of marks on opposing beams.

  • Cut additional 2-inch by 6-inch beams to the width measurement minus 3 inches. Attach a beam to each pair of marks with wood screws driven through the exterior edge of the length beams into the ends of the width beams, creating the basic frame for the floor.

  • Attach sheets of plywood to the top of the frame with 3-inch wood screws spaced 8 inches along each vertical and horizontal beam until the entire surface is covered. Cut off excess along the exterior edge of the frame with a circular saw.

  • Place the flooring on leveled concrete blocks spaced every 3 to 4 feet for support. Attach the metal shed to the flooring following directions included with the purchase of the unit.


  • "Lowe's: Complete Home Improvement and Repair"; Don Vandervort; 2005
  • Photo Credit Jupiterimages/ Images
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