How to Reuse Concrete Slabs as Steps

Calculate the number of risers, number of stair treads and the run of each step. To calculate the number of risers, divide the total rise by the rise for each step, which in this case is the height of the slab, usually between 6 and 8 inches; round up to the nearest whole number. Subtract 1 from the total number of risers to get the number of stair treads needed. Multiply the total number of stair treads by the desired depth for each step to get the total run needed for the steps. Steps typically have a run of 9 to 12 inches.

Excavate the area to create a level foundation for the steps. Add a few inches of gravel and sand if your soil has poor drainage.

Break the slab up into smaller pieces if you want concrete paver steps, otherwise leave the slab whole. Tap the butt of a chisel lightly to score the concrete, and go over the score mark with the hammer and chisel to break up the pieces.

Lay out the first layer of concrete slab to create the first step and check whether it's level. Lay whole slabs or several concrete pavers. The first slab should equal the total run calculated for the steps.

Fill in the gaps between pieces of slab or concrete slab pavers with dry cement mix or polymeric sand. Pack it tightly and lightly mist it with water to begin the hardening process.

Lay the second step directly on top of the first step. In this case, the slab should extend to the total run, minus the run of one step. Again, fill in the gaps between the slabs with a binding agent, such as cement mix or polymeric sand.

Lay the third step over the previous layer of concrete slabs, this time subtracting the run of two steps from the total run to determine the run of the third step. Continue laying each new step in the same way, each time subtracting the run of an additional step to determine the run needed.

Finish the steps with concrete mix or polymeric sand in the gaps between the slabs on the top step, and then mist with water. The binding agent will slowly cure over time as rain wets and hardens it.