2D/CAD drafting in BIM refers to the process of creating 2D drawings and plans using Computer-Aided Design (CAD) software within the context of a Building Information Modeling (BIM) workflow. While BIM primarily deals with creating a digital 3D model of a building or infrastructure, there are instances where 2D drawings are still essential for design documentation, construction documentation, and collaboration with stakeholders who may not use BIM.
Design Development: During the early stages of a BIM project, architects and engineers often create 2D sketches and drawings to explore design concepts and develop initial floor plans, elevations, and sections. These 2D drawings can serve as a basis for creating the 3D BIM model.
Construction Documentation: While the 3D BIM model contains a wealth of information, traditional construction documentation, such as floor plans, elevations, sections, and details, is still needed for permit applications, contractor bids, and construction implementation. CAD drafting is commonly used to produce these 2D construction documents.
Coordination and Collaboration: Not all project stakeholders may have access to BIM software or may prefer working with 2D drawings. CAD drafting enables better coordination and collaboration with architects, contractors, consultants, and other team members who may use different tools or prefer 2D representations.
2D Detailing: While BIM models can store information about building components, sometimes intricate details are better conveyed through 2D drawings. This is particularly important for specific design elements or areas that require precise detailing.
As-Built Drawings: After construction is complete, as-built drawings are produced to document the actual built condition of the facility. While BIM can capture much of this information, producing 2D as-built drawings can still be useful for facility management and future renovations.
It’s worth noting that the 2D/CAD drafting process within BIM workflows can benefit from a more integrated approach. Many BIM software applications allow for the seamless transfer of data between the 3D model and the 2D drawings. Changes made in the 3D model can automatically update the corresponding 2D views, reducing errors and saving time during the design and construction phases. This integrated process ensures that 2D drawings are kept up-to-date with the latest changes in the BIM model, promoting consistency and accuracy throughout the project lifecycle.
