Retaining Walls in Cincinnati: Repair, Rebuilds and New Walls

Retaining walls in Cincinnati hold back water as much as soil

A retaining wall on a Cincinnati hillside lot fights soil, water and gravity. When one leans, bulges or drops stones, the cause is usually trapped water behind it or a footing too shallow for the frost. A leaning wall rarely stops on its own, and when a section fails it can take part of a yard or driveway with it.

Swiss Masonry builds and repairs retaining walls in Cincinnati, Northern Kentucky and southeast Indiana, as a masonry contractor that also works as a general contractor. We repoint and reset old stone walls, rebuild bulged sections, and build new walls in natural stone, segmental block, or poured concrete faced with stone. The owner walks every wall before pricing it and tells you plainly if it needs a repair, a rebuild or an engineer.

Why hillside walls fail here

The steep slopes around Cincinnati sit on the Kope Formation, a shale-rich bedrock that weathers into a clay-rich soil called colluvium. The Ohio Department of Natural Resources says the Cincinnati area has one of the highest per-capita costs from landslide damage of any city in the country, and that slides here tend to start in that colluvium when water pressure builds up (ODNR GeoFacts No. 8). The Kentucky Geological Survey describes the same shale hills in Northern Kentucky. For a wall, that means:

• Water is the real load. A wall with no gravel or drain behind it ends up holding back saturated clay, which pushes far harder than dry soil.
• Frost lifts shallow footings, jacking a wall set on the surface up each winter.
• What happens upslope matters. Both state surveys warn against fill at the top of a slope and digging at the bottom. Ohio’s adds downspouts dumping onto a slope, and Kentucky’s names broken water pipes as a common cause of large slides. A new patio or driveway above an old wall adds load it was never built for.

Many older walls are local limestone. The Ohio Geological Survey says Fairview Formation limestone went into numerous pre-1920 foundations, retaining walls and buildings throughout Cincinnati. In Mount Adams or any hillside neighborhood, an old limestone wall can often be saved if the stone is good and only the mortar, drainage or footing gave out.

What your wall is telling you

If a wall moved suddenly, the ground above it cracked, or it holds up a driveway, house or road, do not dig near it or add weight on top. That wall needs an engineer as well as a mason.

Retaining wall repair or rebuild: three levels of work

Repoint and reset

For a wall still in line. Failed joints are raked out and repointed, loose cap stones reset or replaced with reclaimed stone, and voids packed under any patio slab that bears on the wall. New mortar is Type N portland cement-lime to ASTM C270, or a lime-rich mix on old, soft stone.

Rebuild the failed section

For a bulge or lean confined to one stretch. It comes down, the stone is sorted for reuse, and it goes back up on a firm footing with drainage, tied into the sound wall on each side.

Replace the wall

For a wall moving along its length or sitting on no real footing: new footing, full drainage, and a new wall, often with the original stone back on the face.

Every job is priced after the owner sees it. Common masonry ranges, including residential retaining walls, are on our pricing page.

How we build a retaining wall that drains

1. Read the site. Utilities get marked, and we trace where water reaches the wall: downspouts, a driveway, a neighbor’s yard.
2. Footing below frost. For walls that need a permit, Cincinnati’s retaining wall standards put the bottom of the footing at least 30 inches below finished grade at the face of the wall, on undisturbed or well-compacted soil. Other towns set their own depth.
3. The right base. Mortared stone and poured walls sit on a concrete footing. Segmental block sits on compacted crushed limestone with the first course buried.
4. A batter into the hill, so the face leans slightly back against the soil.
5. Drainage. At least a foot of free-draining stone wrapped in filter fabric, a perforated pipe at the base running to an outlet, and weep holes through mortared walls.
6. Geogrid on taller block walls, laid in layers into compacted backfill to an engineered design.
7. Cap and grade, so surface water runs away from the wall.

The same standards say hollow concrete block shall not be used for retaining walls. An old hollow-block wall usually needs replacing, not patching.

Natural stone, block or poured concrete

Natural stone, mortared or dry-laid, matches older houses and can reuse the stone on site. Our stone work page covers stone types and mortar.

Segmental block is interlocking concrete units set dry on a compacted base. It goes up faster on long or tall runs, and the makers publish engineered designs.

Poured reinforced concrete faced with stone puts the structure in the concrete and the look in the stone. It fits walls that carry a driveway or sit tight to a lot line. See our concrete page. For the terrace above a wall, see patios and outdoor living.

Permits, engineers and hillside rules

• Ohio. The Residential Code of Ohio covers a retaining wall only when the wall is tied to the house or its exits, and even then it needs no approval for a wall up to four feet tall, measured from the bottom of the footing to the top of the wall, unless the wall supports a surcharge such as a driveway, rising slope or building.
• City of Cincinnati. The city’s retaining wall standards set the no-permit limits in the questions below, require Transportation and Engineering approval when a paved roadway falls inside the wall’s zone of influence, and call for a guardrail on walls over 30 inches within 3 feet of a walking surface.
• Kentucky and Indiana have their own rules, applied through county and city building departments, so we check with the local office on every wall.

When a wall needs an engineer’s design, we bring in the engineer, build to the stamped drawings and pull the permit. That is our general contracting side. Swiss Masonry has done masonry in Cincinnati for more than 30 years, with small crews, usually two masons. Insured. Certificate of insurance on request. One-year workmanship warranty.