How to Pour a Concrete Slab on a Slant

Pouring a concrete slab calls for careful preparation and precision. If you're pouring a slab on a slant, for a ramp, driveway, drainage or other purpose, you'll need to mark the forms to accommodate the slant. Learning to pour a concrete slab on a slant enables you to control the height and distance so you can build a safe walkway or ramp on an incline.

String
Wood stakes
Form boards
Hammer
Nails
3/4-inch aggregate
Vibrating tamper tool
2-by-4-inch board
Float

Instructions

- 1
  Pull a string over your excavated pour site from the top of the slant to the bottom. Hold the string at the intended height of the concrete slab along the side of the site. Drive stakes in the ground along each inner wall of the expanse every 3 feet. The top of the stakes should be the same height as your string so the bottom stakes on the sides are lower than the top.
- 2
  Align form boards with the top of the stakes and attach the boards to the stakes with a hammer and nails.
- 3
  Pour 4 inches of 3/4-inch aggregate into the site and tamp with a tamper tool it until the surface is hard and follows the incline of the slant.
- 4
  Add less water than the concrete package recommends so the batch is stiff. Stiff concrete will hold to the incline of the slant better than thin concrete.
- 5
  Pour concrete into the deep side of the slant first and work your way up the incline. Use a vibrating tamper to compress the concrete as you work, preventing it from shifting down the slant.
- 6
  Drag a clean 2-by-4-inch board across the slant to even out the surface and work out air pockets.
- 7
  Use a float to finish the surface of the concrete so it is smooth.

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