Spalling Concrete Underneath Exterior Stairs

A common area for spalling concrete is underneath exterior formed concrete stairs. The spalling is caused by water seeping into the concrete corroding the rebar. As the rust forms on the rebar it expands causing the concrete to break off.

To prevent this from happening, you should have the top surface of the concrete stairs waterproofed. Waterproofing concrete involves prepping the concrete and then troweling on a special waterproofing cement. This will help prevent water from soaking into the concrete corroding the rebar.

Concrete Stairs Repaired & Resurfaced

Today we fixed some concrete stairs that had numerous areas that were spalling. We began repairing the concrete stairs by chiseling out the loose and hollow areas.

Spalled Areas on Concrete Stairs

Spalled Areas on Concrete Stairs

Chiseling Hollow Areas

Chiseling Hollow Areas in Concrete

After chiseling out all of the hollow areas we cleaned the surface with water and a brush and then applied a repair mortar to the spalled areas.

Spalled Areas Chiseled Out

Spalled Areas Chiseled Out

Applying Repair Mortar To Spalled Areas

Applying Repair Mortar To Spalled Areas

After Applying Repair Mortar

After Applying Repair Mortar

Once the repair mortar was hard, we resurfaced the whole stairs to blend it all in.

Before Concrete Stairs Repaired

Before Concrete Stairs Repaired

 

After Concrete Stairs Repaired

After Concrete Stairs Repaired