WHAT IS CHEMICAL INJECTION / SOIL INJECTION FOUNDATION REPAIR?
Soil Injection uses non-toxic, water soluble chemicals (potassium ions and ammonium salts) that 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.
HOW DO WE DO IT?
In most cases, for existing structures, chemical injection is done around the perimeter of a foundation. For driveways, patios, decks, or other paved surfaces, ¾ inch diameter drilled holes through the paving reach the underlying soils. Chemical solution injection reaches up to depths ranging from 7 to 10 feet.
Solution injects happen at relatively low pressures, typically on two separate days. Truck pumps solutions 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 doing interior injections, remove the contents of a home because the chemicals stain and sometimes splatter during injection.
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WHEN USE SOIL INJECTION?
Chemical injection / Soil injection is an appropriate remedy to use when upward movement has started to affect a small area under the foundation. Use with an uplift of 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 injecting an appropriate concentration of the right chemicals 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.
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. When we injection how but it is unsuccessful, 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. Do not ingest the materials. 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 including:
Once foundation upheaval occurrs, we recommend the following types of foundation repairs: