House Underpinning & Reblocking

How To Underpin An Old House: What You Need To Know

Underpinning an old house can help make it safer by reinforcing the foundation it lies on. However, it is worth noting that it is also possible for the process to end up making the situation much worse. To avoid making things worse it is vital that the right underpinning method is chosen.

Read on to find out more about underpinning an old house.

When Do You Need To Underpin An Old House?

Foundation underpinning may be required to strengthen the old foundation of an existing building in different circumstances. First, you might need to turn to underpinning in case you need to add an additional story on top of an existing building. The increase in weight may necessitate the reinforcement of the existing foundation. Foundation underpinning is also needed to strengthen sinking foundations affected by soil subsidence.

Other reasons for foundation underpinning include to strengthen a damaged foundation after natural events such as earthquakes or floods; as well as to correct structural imperfections in the original foundation among others.

Methods Of Underpinning An Old House

Once you discover that your building is in need of foundation underpinning, you will need to choose a suitable underpinning method from the available options.

Concrete underpinning is the oldest method used to underpin old houses. It is mostly suited correcting foundation issues not caused by soil subsidence. The method involves the use of concrete to strengthen the existing foundation of a structure. There are two main types of concrete underpinning, mass and concrete pilings.

Mass concrete underpinning requires the excavation of the area around and sometimes below the existing foundation. Concrete mix is then poured into the excavated area to increase the mass of the existing foundation and ultimately strengthen it.

Concrete pilings on the other hand are nail like piles sunk into the ground, and then attached to the foundation to support it.

Resin underpinning on the other hand is a newer method of foundation underpinning suited to cases where soil subsidence is the main issue. The method involves the injection of a special resin into holes bored around the faulty foundation. The resin usually dries up, binding the soil and foundation together for added strength.

Soil grouting is another effective foundation underpinning method suited for use in areas with granular soil, such as sand. The method involves the injection of a grout that binds the soil granules together making for a solid ground on which the foundation can rest.

Cost Considerations

Before you choose a foundation underpinning method for your old house checkout this great companies website it is important that you compare the cost implications of each method. Concrete underpinning is cost effective when used in small areas. However, the cost sky rockets where the underpinning is required to cover an extensive area as massive excavation is required.

Resin underpinning is more affordable and can be done faster as compared to the above method, especially where low quantities of the material are required. However, where huge crevices in the ground exist the cost may skyrocket as more resin is needed.

The above information will help you make an informed decision when it comes to underpinning an old house.

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