General · July 3, 2021

Methods of Underpinning

What is a foundation? A foundation is typically defined as the most important part of a structure. It is responsible for holding the structure together and allows beams, trusses, and joists to be suspended from it. Without a foundation, integrity of the entire structure can be compromised and the life and death of all occupants could be at risk.

The major difference between an Underwriter’s Bill of Foundations and a structural beam annuity is the method by which the value of the underlying assets are distributed. With a Foundational Certificate, the value of the foundations is determined on a regular basis and the whole of the foundation is analyzed and reassessed to ensure that there are no major imbalances or issues that require attention and follow up. The methodology determines how to correct or minimize any imbalances or issues. For example, a foundation may show that an excessive amount of foundation movement has occurred, but the method by which the motion was obtained may indicate that excessive wear caused the problem in the first place. By fixing the motion or wearing, less foundation damage will occur.

Factors that may affect a property’s valuation – There are many factors which could impact the value of a property, including poor structural design, site features and disfigurement, lack maintenance, or vegetation cover. All of these factors can affect the value of your property. There is no standard formula for valuing a property. These factors should not be taken in isolation. They cannot be used by an assessor for determining whether a property’s security or unsecurity. The validity of the methods of underpinning is still a matter of debate in the industry. If you are considering a new build application or extension to your existing property, it is important to seek the advice and guidance of an independent professional to determine if subsidence might be a problem.

Methods to Underwrite a New Construction Application or Extension – Most construction companies use four types of foundations to provide a solid structure that can support a building or an extension. The four classifications are: Bearing Capacity (CC) – This is the maximum weight that a building or extension can withstand without slipping. This is usually the maximum applied weight of the underlying soil pressure must not exceed this rating. This rating is usually equivalent to one ton per square feet or one ton and a half tons each square foot. The soil load is the force required for the structure to lift one-fifth of its total weight.

Mass Concrete Burnt-Off – If the original structure cannot support this amount of weight, then cantilever beam method of bearing capacity testing is undertaken. To form a thin layer molten metal at bottom of steel beam, mass concrete melbourne underpinning is laid on top of it. This metal is then injected into the old foundation to create a layer of new reinforced concrete which will then be placed on top of the old foundation. Once cooled, the metal melts and solidifies into a mass of highly durable steel that is capable of withstanding loads of up to one and a half million pounds per square foot.

The weakness of these methods lies in the mass concrete method relying on a single thickness of concrete, whereas the soil or borehole method relies on a combination of different thicknesses of concrete depending on the required bearing capacity and depth of excavation. The key benefits of Burnt-Off’s methods are that they are cost-effective, fast, and easy to use. A major disadvantage of this method is that the process is time consuming and subject to constraints of availability of materials to perform the task. If the required thickness of concrete cannot be obtained, this method cannot be used.

A mass conveyor belt method is also effective when undertaking Burnt-Off laying as it relies on the application of a roller conveyor belt to channel the excavated material through the tunnels. Once there, it is then passed through a series of cutouts that form part of the conveyor system which further removes the load. The conveyor system is strong enough to handle heavy loads. One roll of the belt can remove up to five cubic metres of soil, which is roughly equivalent to approximately one million pounds of rock weight. The above mentioned methods are ideal for use with wet fill because soil and rocks will settle and are compacted over time with the added pressure from the installation. This method is the best choice if you need this type of repair but want to minimize costs and have minimal impact on the environment.