Description
Subtract supplied finish build-ups from a structural room span.
Architectural scalar geometry depends on datums, finish build-ups, endpoint conventions and supplied corrections. A nominal lintel seat differs from verified bearing capacity, and internal masonry joints differ from a module repeated with extra end joints. Negative clearances can reveal discrepancies without assessing structural or legal suitability.
Subtract supplied finish build-ups from a structural room span.
When to use this tool
Use Room Dimension Clear Structural Crosswalk when you already have structuralSpan, firstFinishBuildUp, secondFinishBuildUp and need to subtract supplied finish build-ups from a structural room span.
How to use the tool and how it works
- Enter structuralSpan, firstFinishBuildUp, secondFinishBuildUp. Use the units and conventions below.
- Run the tool. Correct any format, range, or cross-field input error before interpreting the output.
- Read clearSpan. Use the output convention below.
Require all three lengths>=0; return structuralSpan-firstFinishBuildUp-secondFinishBuildUp.1
| Input field | Meaning and units | Accepted input |
|---|---|---|
| structuralSpan | Structural Span | Required. Finite number; minimum 0. |
| firstFinishBuildUp | First Finish Build Up | Required. Finite number; minimum 0. |
| secondFinishBuildUp | Second Finish Build Up | Required. Finite number; minimum 0. |
| Output field | Interpretation | Returned shape |
|---|---|---|
| clearSpan | Clear Span | Required. Finite number. |
{
"input": {
"structuralSpan": 4000,
"firstFinishBuildUp": 25,
"secondFinishBuildUp": 15
},
"output": {
"clearSpan": 3960
}
}Limitations and assumptions
- Negative clearance is retained. No wall alignment, construction tolerance, room suitability or code compliance is established.
- Inputs must satisfy both the field types and the cross-field conditions above. Invalid input causes an error; a successful false flag or documented placeholder is a different result.
- Numeric calculations use binary floating point unless exact decimal-integer arithmetic is explicitly stated. No hidden measurement tolerance or decimal rounding is added; nonfinite or out-of-contract results are rejected. Numeric signed-zero results are exported as zero.
Alternative or Complementary methods
Use controlled drawings, site measurements and complete engineering and code assessment. Check geometry, tolerances, loads and applicable requirements before interpreting local dimensions as a valid or safe design.
References
Similar or alternative tools
- Door Undercut Finish Floor Gap
Calculate a supplied finished-floor elevation and door undercut gap.
- Wall Opening Net Masonry Panel Area
Subtract supplied opening area from a rectangular masonry panel area.