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Last edited 15 Dec 2021
What does in situ mean?
In situ (also referred to as insitu or in-situ) is a Latin phrase that is commonly used in the construction industry to mean ‘on site’, ‘in place’ or ‘in position’. It refers to work which is carried out on the construction site itself, often in the finished position, as opposed to in an off-site location as with prefabrication or pre-assembly techniques.
The most common use of the term 'in situ' is in relation to concrete, with components such as a slabs, beams and piles being described as ‘cast in situ’ to distinguish them from precast concrete components, that are manufactured off site.
Generally, in situ construction techniques tend to be more labour- and time-intensive, however, they are more flexible in response to changes that may arise on site. Prefabricated components, in contrast, must be designed in detail in advance, with limited scope for changes once they have been manufactured.
See also: On site.
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