Layered Gypsum Wall STC Lookup

Select the highest-rated caller-supplied layered gypsum wall assembly matching framing, identifier, and minimum-STC filters while preserving laboratory, manufacturer, and test-report provenance.

Description

A wall STC rating belongs to a particular complete tested assembly.

A wall STC rating belongs to a particular complete tested assembly. Similar materials alone do not establish an interchangeable rating.1

The returned values include caveat, Matched assembly identifiers, Selected STC assembly. The How section below explains the calculation, input rules and interpretation.

When to use Layered Gypsum Wall STC Lookup

Use Layered Gypsum Wall STC Lookup when you need to evaluate the supplied records under the calculation and evidence rules below. No laboratory rating is invented, combined with other products or promoted to a field guarantee. The caller supplies the catalog and its source/test records.

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 Layered Gypsum Wall STC Lookup and understand its results

  1. 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.
  2. Enter assemblies, query using the field table and calculation rules, then run the tool.
  3. Read caveat, matchedAssemblyIds, selectedAssembly. The explanation below defines the units, signs, ordering and any flags or placeholder values.
  4. 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 fieldMeaningValue type; see rules belowRequirement
assembliesLayered gypsum assembly tablelist of object; minimum entries: 1; maximum entries: 500Required
queryAssembly filtersobjectRequired
assemblies[].assemblyIdField in assemblies recordstring; minimum length: 1Required in each record
assemblies[].cavityInsulationField in assemblies recordstring; minimum length: 1Required in each record
assemblies[].decouplingField in assemblies recordstring; minimum length: 1Required in each record
assemblies[].framingField in assemblies recordstring; one of "other", "steel", "wood"Required in each record
assemblies[].gypsumLayersPerSideField in assemblies recordinteger; minimum: 1Required in each record
assemblies[].gypsumThicknessMillimetersField in assemblies recordnumber; strictly above: 0Required in each record
assemblies[].ratingBasisField in assemblies recordstring; one of "estimated", "manufacturer-claim", "tested"Required in each record
assemblies[].reportedStcField in assemblies recordnumber; minimum: 0Required in each record
assemblies[].sourceField in assemblies recordstring; minimum length: 1Required in each record
assemblies[].testMethodField in assemblies recordstring; one of "ASTM E90/E413", "ISO 10140-2/ISO 717-1", "manufacturer-method"Required in each record
assemblies[].testReferenceField in assemblies recordstring; minimum length: 1Required in each record
query.assemblyIdField in querystring; minimum length: 1Optional in record
query.framingField in querystring; one of "other", "steel", "wood"Optional in record
query.minimumStcField in querynumber; minimum: 0Optional in record

Supply 1–500 complete assembly records with distinct exact IDs, positive thickness, positive safe-integer gypsum layers per side and nonnegative finite reported STC. Supply a query object, which may be empty. Apply its exact ID/framing filters and inclusive minimum STC. Reject no matches. Sort copied matches by descending STC and then ID using en-US locale comparison; return matched IDs, selected record and caveat.

matches=exact optional ID/framing filters AND STC≥optional minimum; select highest STC then ID

Units, indexing, boundary conditions and exceptional cases are defined in the calculation rules above.

Output fieldMeaningValue type
caveatcaveatstring
matchedAssemblyIdsMatched assembly identifierslist of string; minimum length: 1; maximum entries: 500
selectedAssemblySelected STC assemblyobject
selectedAssembly.assemblyIdField in selectedAssemblystring; minimum length: 1
selectedAssembly.cavityInsulationField in selectedAssemblystring; minimum length: 1
selectedAssembly.decouplingField in selectedAssemblystring; minimum length: 1
selectedAssembly.framingField in selectedAssemblystring; one of "other", "steel", "wood"
selectedAssembly.gypsumLayersPerSideField in selectedAssemblyinteger; minimum: 1
selectedAssembly.gypsumThicknessMillimetersField in selectedAssemblynumber; strictly above: 0
selectedAssembly.ratingBasisField in selectedAssemblystring; one of "estimated", "manufacturer-claim", "tested"
selectedAssembly.reportedStcField in selectedAssemblynumber; minimum: 0
selectedAssembly.sourceField in selectedAssemblystring; minimum length: 1
selectedAssembly.testMethodField in selectedAssemblystring; one of "ASTM E90/E413", "ISO 10140-2/ISO 717-1", "manufacturer-method"
selectedAssembly.testReferenceField in selectedAssemblystring; minimum length: 1
json
{
  "input": {
    "assemblies": [
      {
        "assemblyId": "example-1",
        "cavityInsulation": "Example cavity insulation 1",
        "decoupling": "Example decoupling 1",
        "framing": "steel",
        "gypsumLayersPerSide": 1,
        "gypsumThicknessMillimeters": 15.9,
        "ratingBasis": "manufacturer-claim",
        "reportedStc": 56,
        "source": "Synthetic demonstration record 1; not a verified test report",
        "testMethod": "ASTM E90/E413",
        "testReference": "Synthetic demonstration record 1; not a verified test report"
      },
      {
        "assemblyId": "example-2",
        "cavityInsulation": "Example cavity insulation 2",
        "decoupling": "Example decoupling 2",
        "framing": "steel",
        "gypsumLayersPerSide": 2,
        "gypsumThicknessMillimeters": 31.8,
        "ratingBasis": "manufacturer-claim",
        "reportedStc": 63,
        "source": "Synthetic demonstration record 2; not a verified test report",
        "testMethod": "ASTM E90/E413",
        "testReference": "Synthetic demonstration record 2; not a verified test report"
      }
    ],
    "query": {
      "framing": "steel",
      "minimumStc": 60
    }
  },
  "output": {
    "caveat": "STC is a laboratory single-number rating derived from a specified test method, not a guaranteed field result. Preserve the exact tested construction, test reference, rating basis, and source; flanking, leakage, substitutions, and workmanship can change installed performance.",
    "matchedAssemblyIds": [
      "example-2"
    ],
    "selectedAssembly": {
      "assemblyId": "example-2",
      "cavityInsulation": "Example cavity insulation 2",
      "decoupling": "Example decoupling 2",
      "framing": "steel",
      "gypsumLayersPerSide": 2,
      "gypsumThicknessMillimeters": 31.8,
      "ratingBasis": "manufacturer-claim",
      "reportedStc": 63,
      "source": "Synthetic demonstration record 2; not a verified test report",
      "testMethod": "ASTM E90/E413",
      "testReference": "Synthetic demonstration record 2; not a verified test report"
    }
  }
}

Limitations and assumptions

No laboratory rating is invented, combined with other products or promoted to a field guarantee. The caller supplies the catalog and its source/test records.

Numeric inputs, where present, must be finite. Follow the calculation-specific rules for overflow, underflow and exceptional cases. 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 MLV Product STC Lookup: Mass-loaded vinyl (MLV) is described by surface mass and tested construction. A standalone sound transmission class (STC) claim does not establish the STC of a combined wall. For a complementary task, 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.

References

  1. Layered Gypsum Wall STC Lookup — tool.io

Similar or alternative tools

  • MLV Product STC Lookup

    Mass-loaded vinyl (MLV) is described by surface mass and tested construction. A standalone sound transmission class (STC) claim does not establish the STC of a combined wall.

  • 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.

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