Case Study: Stone Stair Replacement
Before and After
Stone Stair Replacement:
Assignment: Rebuild the stair during the winter.
Cracked, heaved, curved.
The slight curve resulted from the earth heaving inside the stair.
The inside of the step is just loose filler, which freezes and expands.
The repeated expansion and contraction of the filler breaks the step's cement joints.
Inside the stone step
The loose fill absorbs water, freezes, expands.
Empty cavity in step
With much of the fill removed, the source of the problem is clearer.