Interpretation of Drawings, Plans, and Specifications
Interpretation of drawings, plans, and specifications tests whether you can read a set as a coordinated system, not as separate sheets. You must find dimensions, levels, material calls, schedules, revisions, and notes, then resolve conflicts before construction.
Core rules
- Read the title block, drawing number, scale, north arrow, and revision status first.
- Compare plan, elevation, section, detail, and schedule; a door type on plan must match the door schedule.
- Use written dimensions, not scaled measurements from a printed sheet. If a dimension is missing, raise an RFI.
- Check grid lines, datum levels, and cumulative dimension strings for consistency.
- Note general notes and specifications because they govern work not shown graphically.
- Treat revision clouds and delta symbols as controlled changes; replace superseded copies.
Worked example
A wall dimension string shows three bays: 3.00 m, 3.00 m, and 2.70 m, but the overall dimension is 8.80 m. The sum is 8.70 m. You do not “split the difference” on site. You mark the discrepancy, check the latest revision, and issue an RFI. Reasoning: a 100 mm error can affect partitions, door openings, and formwork; the designer must resolve it in writing.
Traps
- Scaling from a distorted PDF or photocopy.
- Using an old revision because it is still on the bench.
- Assuming architectural and structural dimensions agree.
- Ignoring a schedule note such as hardware or fire rating.
The exam rewards systematic cross-checking and documented queries.