Foundation Repair: Polyurethane
Polyurethane foam has become a popular choice for foundation repair in recent years due to its versatility, durability, and cost-effectiveness. One of the most effective ways to use polyurethane foam in foundation repair is through a technique known as deep soil injections. In this article, we will explore what deep soil injections are, why they are needed, and how they work.
What are Deep Soil Injections?
Deep soil injections involve the injection of polyurethane foam into the soil beneath a building’s foundation. The foam is injected at a depth of 10-20 feet, where it expands and creates a solid, load-bearing column. These columns act as support structures, preventing the foundation from settling further and stabilizing the building.
Why are Deep Soil Injections Needed?
Deep soil injections are a valuable tool in foundation repair for several reasons. One of the most significant benefits of this technique is that it can be used to address foundation settlement issues without the need for extensive excavation or foundation replacement. This can save time and money while minimizing disruption to the property.
Deep soil injections can also be effective in areas with difficult soil conditions, such as expansive soils or soils with high moisture content. These soil types can cause significant foundation settling and damage over time, and deep soil injections can help to address these issues by creating stable support structures beneath the foundation.
In addition, deep soil injections can be used in conjunction with other foundation repair techniques, such as underpinning and carbon fiber reinforcement, to provide comprehensive support and stabilization for the foundation.
How do Deep Soil Injections Work?
The process for polyurethane deep soil injection for foundation repair typically involves the following steps:
- Site Evaluation: A foundation repair specialist will evaluate the property to determine the extent of the foundation damage and the most appropriate repair methods. This may involve soil testing, an inspection of the foundation, and other assessments.
- Drilling Holes: Once the evaluation is complete, small holes are drilled into the ground beneath the foundation at specific intervals. These holes are typically 5/8 to 3/4 inch in diameter.
- Injection of Polyurethane Foam: A specialized injection gun is used to inject the polyurethane foam into the soil through the drilled holes. The foam is typically injected at a depth of 10-20 feet below the foundation.
- Foam Expansion: Once the polyurethane foam is injected, it expands and fills the voids in the soil, creating a solid, stable column beneath the foundation. The foam cures within minutes, providing an immediate stabilizing effect.
- Sealing the Holes: Once the foam has completely cured, the injection holes are sealed with grout or other material, restoring the property to its original appearance.
- Final Inspection: After the repair is complete, a final inspection is conducted to ensure that the foundation has been effectively stabilized and to address any remaining issues.
The entire process typically takes only a few hours to complete, depending on the size of the property and the extent of the damage. In most cases, the property can be occupied during the repair process, minimizing disruption to daily activities.
Polyurethane deep soil injection is a highly effective and efficient technique for foundation repair, providing long-lasting stabilization and preventing further damage to the foundation. It is also a cost-effective alternative to traditional foundation repair methods such as excavation and replacement, which can be time-consuming, disruptive, and expensive. If you are experiencing foundation settling or other issues, contact a qualified foundation repair professional to learn more about the benefits of polyurethane deep soil injection.