What is difference between Top bottom construction and Bottom Top construction?

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Accepted Answer

Top bottom construction refers to building from top to bottom while bottom top construction is the opposite.

Top bottom construction involves starting from the top and building downwards while bottom top construction starts from the bottom and builds upwards.
Top bottom construction is commonly used in high-rise buildings while bottom top construction is used in underground structures like tunnels.
Top bottom construction requires scaffolding and cranes while bottom top construction requires excavation equipment and shoring systems.
Top bottom construction is more common and easier to manage while bottom top construction is more complex and requires more planning.
Examples of top bottom construction include skyscrapers and bridges while examples of bottom top construction include tunnels and mines.

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