Soil Injection or Chemical Injection Foundation Repair
WHAT IS CHEMICAL INJECTION / SOIL INJECTION FOUNDATION REPAIR?
Non-toxic, water soluble chemicals (potassium ions and ammonium salts) are injected into the ground under your building. These chemicals inhibit soil’s ability to absorb water so that when it rains your soils do not swell up.
WHEN IS IT USED?
Chemical injection / Soil injection is an appropriate remedy to use when upward movement has started to affect a small area under the foundation. It is best used when uplift is less than 1.5 inches and has not yet extended more than 10 feet towards the interior of the building. This does not remove the upheaval but stops the upheaval from increasing and/or spreading. By stopping the upheaval and leaving the slightly sloped foundation as is, owners can avoid more costly repair.
HOW DOES IT WORK?
Water sticks to almost anything including clay. This attraction causes clay soil to swell. The trick is to use a non swelling chemical to stick to the clay before water does. When an appropriate concentration of the right chemicals is injected into clay, the chemicals stick to the clay molecules and prevent the clays from absorbing water. Once in place, the chemicals stay attached to the clays. In a way by injecting the chemicals into the soil and “coating” the clay, you create a moisture barrier, stopping water from causing more foundation upheaval.
HOW DO WE DO IT?
In most cases, for existing structures, chemical injection is done around the perimeter of a foundation. If there are driveways, patios, decks, or other paved surfaces, ¾ inch diameter holes are drilled through the paving to reach the underlying soils. The chemical solution is injected to depths ranging from 7 to 10 feet. The solution is injected at relatively low pressures, typically on two separate days. The solution is pumped from a truck to a manually operated injection wand.
Injections can be done on the interiors of buildings, however, interior treatment requires that holes be drilled though the floor every 2 feet (one hole for every 4 square feet). While exterior injections are hardly noticeable, this is not true for interior injections. When interior injections are being done, the contents of a home must be removed because the chemicals do stain and can splatter during injection.
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IS THERE A WARRANTY?
Because soils vary significantly in their chemical composition, there is no guarantee that a chemical injection / soil injection will successfully prevent further upheaval. If we inject a home, and the injection does not succeed, we offer a full credit (100 %) against the cost of a complete underpinning if the underpinning is performed by our company.
IS IT TOXIC?
The materials used in the solution are not toxic in small quantities. In the ground, in dilute concentrations, they actually act as fertilizers. The materials should not be ingested. If the solution gets on a persons skin, simply wash it off with soap and water.
HOW DO I PREVENT UPHEAVAL OR FIX UPHEAVAL?
Foundation maintenance can prevent some types of upheaval through the installation of proper foundation drainage [link to foundationdrainage and corresponding pages] including: