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Rock dust vs. Topsoil Lifting in Concrete Lifting: Concrete lifting, as the name suggests, deals with portions of previously installed and cured concrete that has settled below its original elevation. This original specific purpose can be a driveway, sidewalk, patio, stairs, and porch for a residential home. Interior floors of a building or residence are often installed as a graded concrete slab. In all cases, the substrate is prepared before installation in order to stabilize and support this flat concrete for the duration of its expected service life. This utility is expected to last for many decades. The property owner wants it to remain level, without damage or peeling, to ensure safe and smooth access to the property.

Throughout Utah, many soil types determine how well any flat concrete will wear due to years of use and natural exposure. Seasonal freezing and thawing, excessive moisture from irrigation systems or rainfall can undermine even the best prepared substrate. In general, the soil type has enough granular materials to provide long-term stability; however, some soils are expansive, meaning they expand and contract in response to moisture and subfreezing temperatures. This instability is bad news for sloped concrete. These surfaces on vast soils will react and move as a result of changes in their slope. Additionally, gutters and downspouts are unattached or become clogged with leaves, etc., and settle near foundations and concrete slabs. This causes back-drainage and settlement near these concrete elements, exacerbating moisture damage problems.

Slab lifting is an excellent solution to aging concrete surfaces. This method has been around for 50 years or more. Originally, the term silt lift was used to describe the use of topsoil as a key component of the fill. Mixed with a portion of Portland cement, it provides a pressurized lifting process that would return the concrete slab to its original height. Although topsoil is cheap and available, it has a natural tendency to further degrade as the average organic material in Utah topsoil is 5%. These soils decompose in their natural state and provide nutrients to plants. The settling that results from this inherent composting process normally occurs. Recognizing this problem, many slab lift contractors have been looking for more suitable filler materials.

Rock Dust, a ground limestone product and available for safety requirements in the local coal industry, is an excellent substitute for topsoil in the concrete slab lifting process. This material is mixed with Portland cement and pumped through 1 ½ drilled holes under the concrete slab. After all the voids are filled, the dispersed compressed materials exert an upward pressure and a controlled stroke brings the plate back to its original height.

One of the long-term benefits of this inorganic material is the stable guarantees. These slab lift suppliers who use Rock Dust have few callbacks. There is no disintegration of the filling material and therefore no subsequent settling as a result of their process. Those in the industry who use topsoil have up to 20% warranty callbacks. For new construction under the supervision of an architect or licensed engineer, require 6-8″ of topsoil to be removed from the site, especially in areas where concrete surfaces will be installed.

A home or building owner must ask any potential contractor about the fill materials they will be using. Unfortunately many times the answer to this question is concrete, I don’t want to give away the use of topsoil. Concrete, or if it is a consequence, has its own problems. Finished concrete weighs 4,000 pounds per cubic yard. This weight caused the concrete to settle. Not a good plan. Rock Dust provides a lighter subgrade material when installed under pressure. It allows the property owner to have an inorganic compacted base under the surface of the reclaimed concrete. Property owners when considering concrete lifting Utah need to consider the long term and avoid using topsoil.

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