A prototype system is developed and the proposed method is validated in an actual construction project. The quantities of wall framings are then embedded into the properties of drywall in the BIM model and hence they can be extracted directly from the BIM model. Building elements that overlap with the drywalls are subtracted from the drywall surfaces before calculation. Therefore, in this research, an automatic method is proposed for calculating quantities of wall framings from drywalls in a BIM model. The increased geometries in a BIM model also slow down the software performance. Developing wall framing models under a tight schedule in the construction phase is time-consuming, cost-intensive, and error-prone. If BIM models from the design phases do not contain wall framing models, contractors or subcontractors cannot perform quantity takeoff for purchasing materials. Our research focuses on drywalls, which consist of wall framings and wall panels. However, the quality of BIM models affects the quality of BIM-based quantity takeoff. Quantity takeoff based on building information modeling (BIM) is more reliable, accurate, and rapid than the traditional quantity takeoff approach.
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