Clash Detection is an automated process that identifies where HVAC ducts, piping, electrical conduits, and structural elements occupy the same physical space or violate required clearances. Using BIM software like Navisworks, clash detection runs algorithms comparing 3D models to flag conflicts requiring design revisions. This process occurs during design phases, preventing costly field conflicts.
Technical Process
Clash detection algorithms compare geometric boundaries of components and identify hard clashes (overlapping geometry) and soft clashes (insufficient clearances). HVAC-specific protocols establish 2-3 inch minimum clearance between ductwork and electrical conduit, and 6-12 inches between major ductwork runs and structural members. Reports generate coordinates, severity ratings, and recommended resolutions for each conflict.
Implementation Benefits
Early clash detection reduces construction delays by 15-25 percent and rework costs by 35-50 percent. Identifying conflicts during design allows engineers to route ducts vertically, horizontally, or above ceiling space to avoid conflicts. Weekly clash reports during construction administration phases prevent emergency field modifications, maintaining equipment performance and warranty compliance.