WHAT IS CHEMICAL INJECTION / SOIL INJECTION FOUNDATION REPAIR?
Soil Injection uses non-toxic, water soluble chemicals (potassium salts and ammonium ions) that are injected into the ground under your building. These chemicals inhibit a soil’s ability to absorb water so that 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 injection reaches depths ranging from 7 to 10 feet.
Solution injections happen at relatively low pressures, typically on two separate days. Trucks pump 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 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 sometimes splatter during injection.
WHEN TO USE SOIL INJECTION?
Chemical injection / Soil injection is an appropriate remedy to use when upward movement has started to affect a small area under your foundation. Use chemical injection with an uplift of less than 1.5 inches and has not yet extended more than 15 feet towards the interior of the building. Chemical injection does not reverse the uplift, but can help prevent the upheaval from increasing and/or spreading. By stopping the upheaval and leaving the slightly sloped foundation as is, owners can avoid more costly repairs.
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. By injecting the chemicals into the soil and “coating” the clay, you create a moisture barrier, helping to stop 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 an injection is unsuccessful, we offer a 50% credit 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 the ground, in dilute concentrations, they actually act as fertilizers.
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: