Soil Injection, also known as mud-pumping, is an essential part of effective slab foundation work, so our company uses this foundation sealer technique on every project that involves a slab foundation. When structures are leveled or jacked, a space is left between the bottom of the slab and the soil below. If this space or void is not filled, the structure is more likely to move again and require additional foundation work in the near future.
Even with the most reliable methods, gravity wins sooner or later, and the structure begins to sag or settle. All slab-type foundations consist of a concrete reinforced footing and concrete floor. Slab foundations are designed to rest on soil rather than in the air, which is what happens when the floor is leveled.
Our mixture is injected using hoses at various points where the work has occurred. It is thin enough that it can be injected under relatively low pressure and still be pushed along to fill the entire void. Our company has developed a formula of materials to insure that the injected soil not only fills the void but prevents moisture from infiltrating it as well. Because of this, we have had great success in sealing basements that experience moisture entering.
Traditional methods for this issue include excavating soil to the base of the wall or applying materials such as petroleum-based sealants and cloth-like membranes that can contaminate the soil. Excavated dirt is then compacted back against the wall. These materials deteriorate over time and eventually require repairs in addition to disrupting the landscaping. The expense can often be prohibitive due to the extent of work, use of heavy machinery and time involved.
Our method, while not perfect in all applications, is a less messy and more economical way of addressing the issues. Less soil is removed and most of the time it is not necessary to remove plants and other landscaping. The soil material is mixed on site and pumped using hoses that are moved to several points along the footing where the mixture is injected under pressure. The mix is very thin and can seep into the small cracks and crevices that normal concrete find.