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How deep is the foundation of a 3 story building ?

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    -3
    2022-08-23T17:57:51+05:30

    The foundation of the building gives it strength. If the foundation is weak then the building might face damage in a few years. If the foundation is strong then the building will survive longer. If you are thinking how deep should a building foundation be? You should account for various factors that affect the tensile strength of construction. 

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    The depth of a foundation depends on the ground conditions & soil type where construction is happening. Foundation is constructed according to the strata that are needed for complete bearing capacity adopted for the design of footing.

    How deep is the foundation of a 3 story building?

    For a 3-storey building, you will need to have a 7 feet-deep foundation. In case the bearing capacity of the soil and depth of the adjacent foundation is unusual then the depth changes. For a 3-storey (G+2) house, using standard 9″ thick walls, it is recommended the minimum size of the Foundation for footing should be 5’× 5’× 5′ (1.5m x 1.5m×1.5m) with respect to length, breadth and depth.

    How deep is the foundation of a 4 story building ?
    For a four-storey building, a 6 feet (1.8m) deep foundation is needed. 

    How deep is the foundation of a 5 story building ?
    For a five-storey building, a 7 feet (2.1m) deep foundation is needed. I am making the calculation keeping in mind the depth where the desired founding stratum is available.

    This is all from my end on how deep should a building foundation be. 

    Read more :
    How Many Types of Combined Footing are Possible?

    What Is Foundation In Building Construction?

    What is the difference between footing and foundation?

    What is a pier and beam foundation?

    What are the Different Types of Shallow Foundation?

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    -4
    2023-08-23T08:55:45+05:30

    Foundation depth refers to the vertical distance between the base of a building’s structure and the bottom of its foundation elements, which is crucial for providing stability and support by embedding them securely into the ground or soil. The foundation depth for 3 storey building varies based on factors such as soil type, building design, and local regulations. If you are planning to learn more about it, I can share some insights.

    What should be the depth of foundation for 3 storey building?

    A general guideline suggests that the foundation depth for a 3-story building should be around 1/3 to 1/2 of the total building height. This range helps distribute the weight of the structure and counteract potential settling or instability in the soil.

    For example:

    • Suppose a 3-story residential apartment building stands 45 feet tall (approximately 13.7 metres). 
    • Using the guideline of 1/3 to 1/2, the foundation depth for this building might be estimated between 15 and 22.5 feet (4.6 and 6.9 metres).
    • The specific soil conditions of the construction site are crucial in determining the foundation depth. 

    For instance, if the soil is stable and has a high bearing capacity, the foundation might be on the shallower end of the range. However, if the soil is less stable, such as in areas with clay or sandy soil, a deeper foundation might be required to ensure the building’s stability over time. So before constructing a building, ask an expert about all the details related to 3 storey building foundation depth and then proceed.

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    Read More:

    Difference Between Shallow and Deep Foundation?

    What is Minimum Depth of Foundation?

    What Is Foundation In Building Construction?

    What is the difference between footing and foundation?

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