The results demonstrate VDC’s contribution improving the plumbing system designs. This study adopts RFI’s classification in six analyzed categories: correction, omission, validation of information, modification, divergence of information and verification. This is an exploratory and descriptive research. Thus, it is expected to add improvements of water/sanitary facility designs, as well as to assist the virtual construction team to notice and identify design problems. This paper is focused on evaluating requests for information (RFI) associated with water/sanitary facilities of a BIM model. The application of Virtual Design and Construction (VDC) tools to the coordination processes can bring significant value to architecture, structure, and mechanical, electrical, and plumbing (MEP) designs in terms of a reduced number of errors undetected and requests for information. The identification of construction issues in the field generate Request for Information (RFIs) that is one of delays causes. Correcting conflict issues, which were not identified during design and coordination phase, reduces the overall productivity for everyone involved in the construction process. This procedure usually leaves many design errors undetected until construction begins, and typically lead to rework. Detecting information errors from a composite drawing is especially challenging and error prone. Traditionally, the design coordination process is carried out by overlaying and comparing 2D drawings made by different project participants.
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