Flanking Junction Record Lookup
Look up a caller-supplied wall, floor, or ceiling junction detail, report its documented ratings and any direct-versus-apparent difference, and avoid universal flanking corrections.
Description
A junction record may contain direct and apparent sound ratings plus a separately documented correction.
A junction record may contain direct and apparent sound ratings plus a separately documented correction. Missing ratings should remain explicitly unavailable.1
The returned values include calculation, caveat, Reported rating difference, Selected junction detail. The How section below explains the calculation, input rules and interpretation.
When to use Flanking Junction Record Lookup
Use Flanking Junction Record Lookup when you need to evaluate the supplied records under the calculation and evidence rules below. The documented correction is retained in the record but is not applied to the subtraction. A reported rating difference does not identify individual flanking paths or establish a universal correction.
Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
How to use Flanking Junction Record Lookup and understand its results
- Choose the measured quantities, units, weighting and measurement basis before entering values. For a reference, select the exact topic. For a catalog lookup, prepare complete source-backed records; for a screen, select an applicable caller limit.
- Enter details, queryDetailId using the field table and calculation rules, then run the tool.
- Read calculation, caveat, ratingDifferenceDecibels, selectedDetail. The explanation below defines the units, signs, ordering and any flags or placeholder values.
- If the tool reports an input issue, correct the values and run it again. Apply the stated assumptions when interpreting a successfully returned result.
| Input field | Meaning | Value type; see rules below | Requirement |
|---|---|---|---|
| details | Junction detail table | list of object; minimum entries: 1; maximum entries: 200 | Required |
| queryDetailId | Junction detail identifier | string; minimum length: 1 | Required |
| details[].apparentRating | Field in details record | JSON value | Required in each record |
| details[].detailDescription | Field in details record | string; minimum length: 1 | Required in each record |
| details[].detailId | Field in details record | string; minimum length: 1 | Required in each record |
| details[].directRating | Field in details record | JSON value | Required in each record |
| details[].documentedCorrectionDb | Field in details record | JSON value | Required in each record |
| details[].junctionType | Field in details record | string; one of "ceiling-wall", "floor-wall", "other", "wall-wall" | Required in each record |
| details[].metric | Field in details record | string; one of "IIC", "STC", "other", "transmission-loss" | Required in each record |
| details[].ratingBasis | Field in details record | string; one of "estimated", "manufacturer-claim", "not-rated", "tested" | Required in each record |
| details[].source | Field in details record | string; minimum length: 1 | Required in each record |
| details[].testMethod | Field in details record | string; one of "ASTM E336", "ISO 10848", "ISO 15712-1", "field-test", "manufacturer-method" | Required in each record |
| details[].testReference | Field in details record | string; minimum length: 1 | Required in each record |
Supply 1–200 complete records with distinct exact junction IDs and select an exact ID. Numeric rating/correction fields accept finite values or null. If both direct and apparent ratings exist, subtract apparent from direct and mark calculation as difference-of-reported-ratings; otherwise return null and lookup-only. Return the full record and caveat.
difference=direct−apparent if both present, otherwise null Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.
| Output field | Meaning | Value type |
|---|---|---|
| calculation | calculation | string; one of "difference-of-reported-ratings", "lookup-only" |
| caveat | caveat | string |
| ratingDifferenceDecibels | Reported rating difference (dB) | JSON value |
| selectedDetail | Selected junction detail | object |
| selectedDetail.apparentRating | Field in selectedDetail | JSON value |
| selectedDetail.detailDescription | Field in selectedDetail | string; minimum length: 1 |
| selectedDetail.detailId | Field in selectedDetail | string; minimum length: 1 |
| selectedDetail.directRating | Field in selectedDetail | JSON value |
| selectedDetail.documentedCorrectionDb | Field in selectedDetail | JSON value |
| selectedDetail.junctionType | Field in selectedDetail | string; one of "ceiling-wall", "floor-wall", "other", "wall-wall" |
| selectedDetail.metric | Field in selectedDetail | string; one of "IIC", "STC", "other", "transmission-loss" |
| selectedDetail.ratingBasis | Field in selectedDetail | string; one of "estimated", "manufacturer-claim", "not-rated", "tested" |
| selectedDetail.source | Field in selectedDetail | string; minimum length: 1 |
| selectedDetail.testMethod | Field in selectedDetail | string; one of "ASTM E336", "ISO 10848", "ISO 15712-1", "field-test", "manufacturer-method" |
| selectedDetail.testReference | Field in selectedDetail | string; minimum length: 1 |
{
"input": {
"details": [
{
"apparentRating": null,
"detailDescription": "Example detail description 1",
"detailId": "example-1",
"directRating": null,
"documentedCorrectionDb": null,
"junctionType": "floor-wall",
"metric": "STC",
"ratingBasis": "not-rated",
"source": "Synthetic demonstration record 1; not a verified test report",
"testMethod": "ISO 10848",
"testReference": "Synthetic demonstration record 1; not a verified test report"
}
],
"queryDetailId": "example-1"
},
"output": {
"calculation": "lookup-only",
"caveat": "Junction corrections are construction- and path-specific. ASTM E90 laboratory STC suppresses significant flanking paths, while ASTM E336 field metrics include measured indirect paths; ISO 10848 and ISO 15712-1 address different flanking problems. The tool reports only caller-supplied evidence and does not invent a universal correction.",
"ratingDifferenceDecibels": null,
"selectedDetail": {
"apparentRating": null,
"detailDescription": "Example detail description 1",
"detailId": "example-1",
"directRating": null,
"documentedCorrectionDb": null,
"junctionType": "floor-wall",
"metric": "STC",
"ratingBasis": "not-rated",
"source": "Synthetic demonstration record 1; not a verified test report",
"testMethod": "ISO 10848",
"testReference": "Synthetic demonstration record 1; not a verified test report"
}
}
}Limitations and assumptions
The documented correction is retained in the record but is not applied to the subtraction. A reported rating difference does not identify individual flanking paths or establish a universal correction.
Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. Extremely large text inputs are rejected. Missing fields without a declared default, extra fields, wrong value types and violations of the calculation rules are input errors.
Alternative or Complementary methods
Use ASTC Field-Rating Reference: ASTC is an apparent field rating that includes sound transmitted by the separating assembly and associated flanking paths. This reference explains the selected concept and the evidence needed to interpret it. For a complementary task, use Layered Gypsum Wall STC Lookup: A wall STC rating belongs to a particular complete tested assembly. Similar materials alone do not establish an interchangeable rating.
References
-
Flanking Junction Record Lookup — tool.io
Similar or alternative tools
- ASTC Field-Rating Reference
ASTC is an apparent field rating that includes sound transmitted by the separating assembly and associated flanking paths. This reference explains the selected concept and the evidence needed to interpret it.
- Layered Gypsum Wall STC Lookup
A wall STC rating belongs to a particular complete tested assembly. Similar materials alone do not establish an interchangeable rating.