The method
Before using the result
- This is a local worksheet. Findings and supplied criteria remain the responsibility of the person recording them; the output is not a certificate or regulatory approval.
- Example dimensions and optional criteria are not universal regulatory limits.
Worked examples
These original training examples illustrate the method for International Code Council Residential Building Inspector Examination (ICC B1). Use the matching “Load example” button above to explore a variation; example values are not equipment settings or prescribed criteria.
1. Worked example
Record individual measurements before evaluating the range and variation. Attach the source and edition of any limits used in an inspection-training comparison.
- Compare supplied criteria
- No
Supplied measured stair dimensions
| Riser height (mm) | Tread depth (mm) |
|---|---|
| 170 | 280 |
| 172 | 282 |
| 171 | 281 |
- Riser variation = max − min = 0.001999999999999974 m.
- No criterion comparison requested.
- Minimum riser: 0.17 m
- Maximum riser: 0.172 m
- Riser variation: 0.002 m
- Minimum tread: 0.28 m
2. Comparison example
Compare a different supplied condition using the same method. For Inspector Exam, the important check is that the input meaning, units and method assumptions still match the problem.
- Compare supplied criteria
- No
Supplied measured stair dimensions
| Riser height (mm) | Tread depth (mm) |
|---|---|
| 165 | 290 |
| 170 | 280 |
- Riser variation = max − min = 0.0050000000000000044 m.
- No criterion comparison requested.
- Minimum riser: 0.165 m
- Maximum riser: 0.17 m
- Riser variation: 0.005 m
- Minimum tread: 0.28 m
Check your understanding
1. Which relationship is used?
Report min/max and variation of measured risers/treads; optionally compare only with explicitly supplied criteria.
2. Which assumption should you check first?
This is a local worksheet. Findings and supplied criteria remain the responsibility of the person recording them; the output is not a certificate or regulatory approval.
3. How should you verify a different unit system?
Convert every input to the displayed calculation units first. Equivalent physical inputs must give equivalent results; a unit label alone does not convert a number.
Continue with the matching exam topic
This tool connects to International Code Council Residential Building Inspector Examination (ICC B1) free practice. Work through a question independently, then use the calculation steps to identify where your method differs. The tool stays free whether or not you choose paid preparation.