Leading Indicators for the Prevention of Building Design Defects
Design Quality Drivers are an important consideration that should be examined to assure design quality, and RT-320a identified 11 types.
Based on the survey results, the team distinguished 14 design deliverables as problematic and merged them into the following seven major problematic design deliverables:
- Roof details
- Mechanical controls
- Exterior wall systems
- Low-voltage systems
- Installed specialty equipment
- Project phasing
- Delegated design
RT-320a identified the impacts associated with design defects, as shown in the graph.
RT-320a identified the seven most problematic design deliverables and 47 design defects, along with their associated causal factors and impacts. Then team members generated 160 leading indicators. The table summarizes the causal factors, impacts, and leading indicator questions for each design defect.
The team developed an Excel-based design quality assessment tool. This tool is designed to assess the current level of building design quality as indicated by the user’s response to leading indicator questions about deliverables in the context of detailed design milestones. It also allows the user to identify potential design defects and their associated impacts, and to facilitate design defect prevention and mitigation strategies for overall improvement of building design deliverable quality.
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