As-built drawings and record drawings
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Apart from registering on site changes to the engineers' and architect's drawings it is essential that the specialist trade contractors reflect what has been installed on site.
Records of underfloor cabling in city offices is a particular problem because successive tenants cut off but leave in their predecessors cables and providing space is available install their own systems. Without cabling records this can prove a nightmare for say the fourth company to occupy the premises.
There is an issue relating to the method or convention for recording site changes during construction. The issue is that site changes need to be highlighted or made to stand out in order to identify them. This article mentions use of red ink to signify changes, but this is no use when the architectural drawing is a mass or various lines of various colours.
There needs to be a standard way of highlighting changes or revisions on a drawing and it must be easily understood and obvious.
When applying for an amendment of a building warrant it is necessary to show revisions when submitting drawings for local authority approval. These amended drawings should clearly show what has changed from the original approved drawings. This means that as-built drawings alone are not sufficient, unless it is easy to tell what is different from the original approved drawings. The original drawings have presumably already been assessed and approved, so all that needs to be checked is what has changed to ensure the design is acceptable.
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