Cedarshed :: How To Build A Foundation for Gazebos and Sheds
3. CONCRETE SLAB FOUNDATION
Typically a slab 3-4 inches thick laid over a subbase of 4 inches of gravel or crushed rock is sufficient but may vary depending on your geographic location.
Using either mix your own concrete of having it delivered by truck, ready to pour, depends on how much time and effort you have to dedicate to the project. A slab for our 8×10 foot Rancher or a 10 foot gazebo both to a depth of 4 inches will require approximately 1 cubic yard of premixed concrete.
Use the following procedure:
1. Excavate the slab area and footing trench.
2. Excavate the slab area to a depth 6 inches. This would put the finished slab surface 2 inches above ground (4 inches of gravel)
3. Set up your batter board strings to represent the outside face of the slab. At each corner, drop a plumb line from the intersecting strings to the bottom of the trench, then drive a 2×4 stake at this point. Using the plumb bob again, drive a nail into the top of the stake where the plumb bob touches it. Attach strings between the stakes. Using the strings as guides, drive the 2×4 form stakes around the trench perimeter, spaced on 2 foot centers.
4. Attach the form boards to the stakes with double-headed nails. Make sure the stakes are on the outside of the boards and flush with or below them.
5. Use 2×4 stakes to brace the corners of the forms.
6. Backfill the excavation with 4 inches of gravel, then lay down a plastic vapor barrier.
7. Spread or pour concrete with a rake or hoe, compacting it gently into the footing areas. Use a shovel to move concrete into footing trench. Make the pour to about 1 inch above the forms to allow for settling. Use a long 2×4 to level the concrete. Move the board in a side-to-side motion as you pull it towards you.
8. Use finishing tools, such as a bull float and trowel, to smooth the concrete surface. Allow the concrete to cure fully (seven to ten days).
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