AS-BUILT – WHAT DOES IT MEAN?
As-built documentation vs. construction drawing - what is the difference?
As-built documentation is documentation of the actual state of a building or construction project. A construction drawing, on the other hand, shows the planned state of a project. Anyone who has already been involved in a construction project knows that there can be considerable differences between the planning and the result. In order to obtain realistic documentation of the project, it is necessary to carry out as-built documentation in addition to the construction drawing.
Starting as early as possible: Documentation of construction progress
So does it make sense to simply create as-built documentation after the project is finished? Of course, the finished project should be fully documented. However, it is even better to start much earlier. Especially with larger projects, it is advisable to document the various stages of the construction progress. There are several reasons for this. On the one hand, it allows all those involved to be kept up to date on the progress of construction.
Even more important, however, is the comparison with the construction drawing and the planning. This way, possible complications can be recognized at an early stage and dealt with accordingly. After each construction step, costs can be adjusted if necessary, new permits can be obtained, materials can be exchanged, the statics can be recalculated, and so on. This makes it easier to avoid unpleasant surprises and cost explosions.
Of course, final as-built documentation should also be carried out after the project has been completed, and it is also worthwhile to acquire it for already existing structures. On the basis of the as-built documentation, subsequent conversion measures or installations can be planned and carried out. In addition, it provides important information for disaster control and rescue forces in case of an emergency.
How is as-built documentation created?
But a reality capture and a simple 3D model are often not sufficient for as-built documentation. Depending on the requirements, further information must be included in the documentation and there is also a lot to consider when creating the 3D model.
For instance, the level of detail, or LOD for short, plays an important role in 3D modelling. For example, should the valves of water systems be modelled down to the smallest detail or is it sufficient to roughly represent them in the correct position and orientation? Such questions should already be clarified and discussed with the modeller before the documentation is created. The modeller can determine in a personal conversation which LOD level is required for your project. There is no industry standard for the accuracy of as-built documentation. This is not least due to the fact that a higher degree of accuracy is associated with additional costs, which of course one does not want to bear if it is not needed for the project in question.
Another point that must be taken into account is additional information. For example, should the material of the floor, doors, windows, etc. also be documented? Which window model is used? Should invoices and static certificates be stored? These questions must also be clarified and the scope must be determined before preparing as-built documentation.
Ultimately, the scope and accuracy of as-built documentation always depends on your individual requirements. In general, however, it can be said that at least a rough digital reality capture by means of laser scanning is always useful.This way, errors can be avoided in the construction phase and possible subsequent construction work can be implemented more easily.
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