Foundation Types for 12x16 Garden Shed
Concrete Slab Foundation:
- Slab must be at least the same size as assembled floor frame (141 1/2” x 182”) or larger.
- 6” Deep foundation.
- 3.4 Cubic Yards of concrete required.
- A concrete slab will have the longest durability out of your foundation options.
Once level, a concrete slab is the easiest surface to build on.
Gravel with 4x4 Pressure Treated Stringers:
- Excavate at least 6” deep, and 6” wider than floor frame on each side.
- 3.9 Cubic Yards of gravel required, approximately 36 wheelbarrows.
- 9 - 4x4 Pressure Treated Stringers 12’ long required.
- Evenly spaced, with one at each end of floor frame.
Saves money on materials, easy to level and work with.
Gravel with Patio Paver Stones:
- Excavate at least 6” deep, and 6” wider than floor frame on each side.
- 3.9 Cubic Yards of gravel required, approximately 36 wheelbarrows.
- 45 patio pavers (8” x 8” or larger).
- Center patio paver stones underneath floor runners and underneath seams in floor joists.
Patio paver stones are widely available from most landscape stores.
141 1/2”
182”
6” Deep
9 - 4”x4”x144”
45 Patio Stones
Floor Frame
Concrete Foundation
Completed Foundation
18 13/16”
Gravel Foundation
Gravel Foundation with treated stringers
Completed Foundation
Gravel Foundation
Completed Foundation
141 1/2”
182”
153 1/2”
194”
153 1/2”
194”
Gravel Foundation with Patio Pavers
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