{
  "kind": "bimfit_reference_building_manifest",
  "schemaVersion": 1,
  "id": "duplex-apartment",
  "name": {
    "ko": "듀플렉스 아파트",
    "en": "Duplex Apartment"
  },
  "summary": {
    "ko": "buildingSMART 공개 표준 모델. 설비·전기·배관 모델을 모두 갖춘 2세대 주택.",
    "en": "A two-dwelling house released as an open standard model, with its mechanical, electrical and plumbing models intact."
  },
  "useType": "apartment_building",
  "licence": "CC BY 4.0",
  "attribution": "BSI (2020) \"Duplex Apartment Test Files\", buildingSMART International — https://github.com/buildingsmart-community/Community-Sample-Test-Files",
  "sourceUrl": "https://github.com/buildingsmart-community/Community-Sample-Test-Files",
  "generatedAt": "2026-09-04T00:00:00.000Z",
  "sourceFiles": [
    {
      "role": "architectural",
      "fileName": "Duplex_A_20110907.ifc",
      "sha256": "b347a2c8aa8fff6db896a4417a9c50c22ac0ccd7c5cfc22b99b8d29336c606ed",
      "byteLength": 2380763,
      "units": {
        "lengthToMetres": 1,
        "areaToSquareMetres": 1,
        "lengthUnitName": "METRE",
        "areaUnitName": "SQUARE_METRE",
        "lengthAssumed": false,
        "areaAssumed": false
      }
    },
    {
      "role": "rooms",
      "fileName": "Duplex_M_20111024_ROOMS_AND_SPACES.ifc",
      "sha256": "3cd577ecff9daf91632789a408070251a431b198de7be47f64e01c7fda1be92b",
      "byteLength": 8781887,
      "units": {
        "lengthToMetres": 1,
        "areaToSquareMetres": 1,
        "lengthUnitName": "METRE",
        "areaUnitName": "SQUARE_METRE",
        "lengthAssumed": false,
        "areaAssumed": false
      }
    },
    {
      "role": "hvac",
      "fileName": "Duplex_MEP_20110907.ifc",
      "sha256": "13976a8e223f177a6d7123679e4b02e750cd90c13f7bb20c593be125d9407119",
      "byteLength": 17871432,
      "units": {
        "lengthToMetres": 1,
        "areaToSquareMetres": 1,
        "lengthUnitName": "METRE",
        "areaUnitName": "SQUARE_METRE",
        "lengthAssumed": false,
        "areaAssumed": false
      }
    },
    {
      "role": "electrical",
      "fileName": "Duplex_Electrical_20121207.ifc",
      "sha256": "d47b014ed5b3428496683ee75e4664013f6df8237ea571b8d13f877cea0b7a94",
      "byteLength": 1602758,
      "units": {
        "lengthToMetres": 0.3048,
        "areaToSquareMetres": 0.09290304,
        "lengthUnitName": "FOOT",
        "areaUnitName": "SQUARE FOOT",
        "lengthAssumed": false,
        "areaAssumed": false
      }
    },
    {
      "role": "plumbing",
      "fileName": "Duplex_Plumbing_20121113.ifc",
      "sha256": "abfaf5c0979b6b4b05182aec7ada8945374bdb414db76c763724d549b41b212b",
      "byteLength": 31556138,
      "units": {
        "lengthToMetres": 0.001,
        "areaToSquareMetres": 0.000001,
        "lengthUnitName": "MILLIMETRE",
        "areaUnitName": "MILLISQUARE_METRE",
        "lengthAssumed": false,
        "areaAssumed": false
      }
    }
  ],
  "counts": {
    "storeys": 3,
    "spacesTotal": 37,
    "spacesFloor": 18,
    "assemblies": 15,
    "externalElements": 33,
    "exteriorWalls": 12,
    "windows": 22,
    "exteriorCurtainWalls": 0,
    "exteriorDoors": 4
  },
  "areas": {
    "totalFloorAreaSqm": 284.98,
    "areaPlanTotalSqm": 799.76,
    "exteriorWallNetSqm": 267.16,
    "exteriorWallBelowRoofSqm": 211.61,
    "exteriorWallAboveRoofSqm": 55.56,
    "exteriorWallByOrientationSqm": {
      "N": 34.67,
      "NE": 0,
      "E": 100.46,
      "SE": 0,
      "S": 33.12,
      "SW": 0,
      "W": 98.91,
      "NW": 0
    },
    "glazingApertureSqm": 64.46,
    "glazingByOrientationSqm": {
      "N": 20.32,
      "NE": 0,
      "E": 11.91,
      "SE": 0,
      "S": 20.32,
      "SW": 0,
      "W": 11.91,
      "NW": 0
    },
    "exteriorDoorSqm": 8.96,
    "exteriorDoorByOrientationSqm": {
      "N": 1.97,
      "NE": 0,
      "E": 2.51,
      "SE": 0,
      "S": 1.97,
      "SW": 0,
      "W": 2.51,
      "NW": 0
    },
    "openingsNote": "Glazing aperture 64.46 m² = 22 IfcWindow at OverallWidth × OverallHeight (64.46 m²). Exterior doors are separate — a door is aperture, not glazing: 4 IfcDoor, 8.96 m², OverallWidth × OverallHeight. Host wall by IfcRelFillsElement → IfcOpeningElement → IfcRelVoidsElement (26 openings). Sector is the host wall's, from the same orientation pass as the wall split. Envelope by a both-sides probe against the conditioned IfcSpace solids (18 of 18 have geometry); this file has no IfcCurtainWall; 10 openings hosted in walls outside the exterior set; 2 unresolved (1.49 m² where a size is stated). IsExternal is reported per row and never used as a filter — it means \"not an interior partition\" to an authoring tool, never \"bounds conditioned space against outdoor air\". It marks 4 door(s) here; 4 confirm against an exterior wall. Rows in openings.json.",
    "conditionedVolumeGrossM3": 854.79,
    "roomVolumeNetM3": 639.88,
    "volumeNote": "Gross from 18 spaces (floor area × storey height; voids, and rooms taller than their storey with no void above, as their own solids); net from 18 spaces (16 from own solid, 2 from floor area × solid height, solid not closed), ROOF excluded; a further 18 rows are the authoring tool's analytical spaces standing over these same rooms and are excluded from both figures, because that is the same air counted twice; 2 solids failed the closed-mesh test and are counted as floor area × their own height. A closed tessellation's signed volume is exact.",
    "roofProjectedSqm": 132.93,
    "roofProjectedByFamilySqm": {
      "Basic Roof:Live Roof over Wood Joist Flat Roof": 132.93
    },
    "roofElementSumSqm": 132.93,
    "roofUnionSqm": 132.93,
    "roofSurfaceSqm": 132.93,
    "roofSurfaceByFamilySqm": {
      "Basic Roof:Live Roof over Wood Joist Flat Roof": 132.93
    },
    "roofNote": "Plan shadow per element (union of its projected triangles, ifc-plan-shadow.mjs): 1 elements — 1 IfcSlab.PredefinedType=ROOF. roofProjectedSqm sums 1 roof type(s), each as the union of its elements; the elements themselves sum to 132.93 m² (elements of one type overlapping in plan) and all types together cover 132.93 m² (one type above another). surfaceSqm is each element's true one-sheet surface (Σ area of its upward faces; ÷ 2 where a surface model has no downward face and both sheets are wound upward; ÷ the coverage where its parts cover its shadow more than once, as stacked layer solids do — surfaceBasis says which), summing to 132.93 m²; a flat deck's surface equals its shadow, a pitched roof's exceeds it. 1 IfcRoof carry no geometry of their own and are measured through the IfcSlab ROOF parts they aggregate. ",
    "groundSlabSqm": 129.69,
    "groundSlabSumSqm": 256.22,
    "groundPerimeterM": 69.1,
    "groundHolePerimeterM": 0,
    "groundNote": "IfcSlab (not ROOF or LANDING) on storeys at or below Level 1 (0 m): 10 candidate(s). A slab counts as ground envelope when a conditioned space stands on it — its shadow overlaps a conditioned ground-storey space footprint (8 of 8 such spaces have one: 8 solid) or an IfcRelSpaceBoundary names it as bounding one. IsExternal is not consulted. 8 counted, 2 excluded: \"Floor:150mm Exterior Slab on Grade:216507\" 25.42 m², \"Floor:150mm Exterior Slab on Grade:216552\" 25.42 m². groundSlabSqm is the union of the counted shadows (they sum to 256.22 m²; stacked build-up layers count once); groundPerimeterM is the outline's outer rings (2 polygons)."
  },
  "assemblies": [
    {
      "id": "assembly-basic-wall-exterior-brick-on-block",
      "name": "Basic Wall:Exterior - Brick on Block",
      "totalThicknessM": 0.417,
      "layers": [
        {
          "name": "Masonry - Brick",
          "thicknessM": 0.092,
          "ref": "ifc://Duplex_A_20110907.ifc#3892"
        },
        {
          "name": "Misc. Air Layers - Air Space",
          "thicknessM": 0.025,
          "ref": "ifc://Duplex_A_20110907.ifc#3901"
        },
        {
          "name": "Insulation / Thermal Barriers - Rigid insulation",
          "thicknessM": 0.05,
          "ref": "ifc://Duplex_A_20110907.ifc#3916"
        },
        {
          "name": "Masonry - Concrete Block",
          "thicknessM": 0.193,
          "ref": "ifc://Duplex_A_20110907.ifc#3931"
        },
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.041,
          "ref": "ifc://Duplex_A_20110907.ifc#3940"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#3981"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#3982"
    },
    {
      "id": "assembly-basic-wall-interior-partition-92mm-stud",
      "name": "Basic Wall:Interior - Partition (92mm Stud)",
      "totalThicknessM": 0.124,
      "layers": [
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#4199"
        },
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.092,
          "ref": "ifc://Duplex_A_20110907.ifc#4200"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#4201"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#4202"
    },
    {
      "id": "assembly-basic-wall-party-wall-cmu-residential-unit-dimising-wall",
      "name": "Basic Wall:Party Wall - CMU Residential Unit Dimising Wall",
      "totalThicknessM": 0.55,
      "layers": [
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#4353"
        },
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.041,
          "ref": "ifc://Duplex_A_20110907.ifc#4354"
        },
        {
          "name": "Masonry - Concrete Block",
          "thicknessM": 0.193,
          "ref": "ifc://Duplex_A_20110907.ifc#4355"
        },
        {
          "name": "Misc. Air Layers - Air Space",
          "thicknessM": 0.05,
          "ref": "ifc://Duplex_A_20110907.ifc#4356"
        },
        {
          "name": "Masonry - Concrete Block",
          "thicknessM": 0.193,
          "ref": "ifc://Duplex_A_20110907.ifc#4357"
        },
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.041,
          "ref": "ifc://Duplex_A_20110907.ifc#4358"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#4359"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#4360"
    },
    {
      "id": "assembly-basic-wall-foundation-concrete-417mm",
      "name": "Basic Wall:Foundation - Concrete (417mm)",
      "totalThicknessM": 0.417,
      "layers": [
        {
          "name": "Concrete - Cast In Situ",
          "thicknessM": 0.417,
          "ref": "ifc://Duplex_A_20110907.ifc#4800"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#4801"
    },
    {
      "id": "assembly-basic-wall-foundation-concrete-435mm",
      "name": "Basic Wall:Foundation - Concrete (435mm)",
      "totalThicknessM": 0.435,
      "layers": [
        {
          "name": "Concrete - Cast In Situ",
          "thicknessM": 0.435,
          "ref": "ifc://Duplex_A_20110907.ifc#5039"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#5040"
    },
    {
      "id": "assembly-floor-127mm-slab-on-grade",
      "name": "Floor:127mm Slab on Grade",
      "totalThicknessM": 0.127,
      "layers": [
        {
          "name": "Concrete",
          "thicknessM": 0.127,
          "ref": "ifc://Duplex_A_20110907.ifc#5243"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#5244"
    },
    {
      "id": "assembly-basic-wall-interior-plumbing-152mm-stud",
      "name": "Basic Wall:Interior - Plumbing (152mm Stud)",
      "totalThicknessM": 0.184,
      "layers": [
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#5839"
        },
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.152,
          "ref": "ifc://Duplex_A_20110907.ifc#5840"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#5841"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#5842"
    },
    {
      "id": "assembly-floor-residential-wood-joist-with-subflooring",
      "name": "Floor:Residential - Wood Joist with Subflooring",
      "totalThicknessM": 0.305,
      "layers": [
        {
          "name": "Wood - Sheathing - plywood",
          "thicknessM": 0.019,
          "ref": "ifc://Duplex_A_20110907.ifc#6212"
        },
        {
          "name": "Wood - Dimensional Lumber",
          "thicknessM": 0.286,
          "ref": "ifc://Duplex_A_20110907.ifc#6221"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#6222"
    },
    {
      "id": "assembly-floor-finish-floor-wood",
      "name": "Floor:Finish Floor - Wood",
      "totalThicknessM": 0.019,
      "layers": [
        {
          "name": "Wood - Flooring",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#20870"
        },
        {
          "name": "Insulation / Thermal Barriers - Semi-rigid insulation",
          "thicknessM": 0.003,
          "ref": "ifc://Duplex_A_20110907.ifc#20879"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#20880"
    },
    {
      "id": "assembly-floor-finish-floor-ceramic-tile",
      "name": "Floor:Finish Floor - Ceramic Tile",
      "totalThicknessM": 0.013,
      "layers": [
        {
          "name": "Ceramic Tile",
          "thicknessM": 0.01,
          "ref": "ifc://Duplex_A_20110907.ifc#21278"
        },
        {
          "name": "Masonry - Grout",
          "thicknessM": 0.003,
          "ref": "ifc://Duplex_A_20110907.ifc#21319"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#21320"
    },
    {
      "id": "assembly-basic-roof-live-roof-over-wood-joist-flat-roof",
      "name": "Basic Roof:Live Roof over Wood Joist Flat Roof",
      "totalThicknessM": 0.457,
      "layers": [
        {
          "name": "Site - Grass",
          "thicknessM": 0.064,
          "ref": "ifc://Duplex_A_20110907.ifc#22624"
        },
        {
          "name": "Roofing - Barrier",
          "thicknessM": 0.006,
          "ref": "ifc://Duplex_A_20110907.ifc#22633"
        },
        {
          "name": "Roofing - EPDM Membrane",
          "thicknessM": 0.006,
          "ref": "ifc://Duplex_A_20110907.ifc#22642"
        },
        {
          "name": "Insulation / Thermal Barriers - Rigid insulation",
          "thicknessM": 0.076,
          "ref": "ifc://Duplex_A_20110907.ifc#22643"
        },
        {
          "name": "Wood - Sheathing - plywood",
          "thicknessM": 0.019,
          "ref": "ifc://Duplex_A_20110907.ifc#22644"
        },
        {
          "name": "Wood - Dimensional Lumber",
          "thicknessM": 0.286,
          "ref": "ifc://Duplex_A_20110907.ifc#22645"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#22646"
    },
    {
      "id": "assembly-compound-ceiling-gypsum-board",
      "name": "Compound Ceiling:Gypsum Board",
      "totalThicknessM": 0.057,
      "layers": [
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.045,
          "ref": "ifc://Duplex_A_20110907.ifc#23672"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.012,
          "ref": "ifc://Duplex_A_20110907.ifc#23673"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#23674"
    },
    {
      "id": "assembly-basic-wall-interior-furring-152-mm-stud",
      "name": "Basic Wall:Interior - Furring (152 mm Stud)",
      "totalThicknessM": 0.152,
      "layers": [
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.136,
          "ref": "ifc://Duplex_A_20110907.ifc#24661"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#24662"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#24663"
    },
    {
      "id": "assembly-floor-150mm-exterior-slab-on-grade",
      "name": "Floor:150mm Exterior Slab on Grade",
      "totalThicknessM": 0.15,
      "layers": [
        {
          "name": "Concrete - Cast In Situ",
          "thicknessM": 0.15,
          "ref": "ifc://Duplex_A_20110907.ifc#37847"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#37848"
    },
    {
      "id": "assembly-basic-wall-interior-furring-38-mm-stud",
      "name": "Basic Wall:Interior - Furring (38 mm Stud)",
      "totalThicknessM": 0.054,
      "layers": [
        {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.038,
          "ref": "ifc://Duplex_A_20110907.ifc#37951"
        },
        {
          "name": "Plasterboard",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#37952"
        }
      ],
      "ref": "ifc://Duplex_A_20110907.ifc#37953"
    }
  ],
  "orientation": {
    "trueNorthDeg": null,
    "northAssumed": true,
    "weakOutwardCount": 0,
    "offCardinalCount": 0,
    "offCardinalSqm": 0,
    "wallCount": 12,
    "note": "Azimuths are clockwise from north, where north is the model's -Z after web-ifc's Z-up to Y-up conversion. Outward face inferred by comparing each face's centroid with the building centre, which is correct for a convex plan and can be wrong at a re-entrant corner."
  },
  "site": {
    "declaredSiteName": "Default",
    "declaredLatitudeDeg": 41.8744,
    "declaredLongitudeDeg": -87.63939999972223,
    "locationIsAuthoringDefault": true,
    "locationNote": "IfcSite is an unfilled Autodesk Revit Architecture 2011 template: its Name is the literal 'Default', its postal address line is still the placeholder 'Enter address here', and its RefElevation is a signed zero. The 41.8744 N, 87.6394 W coordinate and the 'Chicago', 'IL' town and region are the template's own, not a survey and not a statement about this building, so no position, orientation, climate or solar geometry may be taken from any of them. TrueNorth is absent ($) in both the Model and Plan representation contexts, so the model states no orientation either.",
    "statedTown": null,
    "trueNorthStated": false
  },
  "storeys": [
    {
      "id": "storey-level-1",
      "name": "Level 1",
      "elevationM": 0,
      "floorToFloorHeightM": 3.1,
      "spaceCount": 15,
      "spacesCountingAsFloor": 8,
      "floorAreaSqm": 141.79,
      "ref": "ifc://Duplex_M_20111024_ROOMS_AND_SPACES.ifc#39"
    },
    {
      "id": "storey-level-2",
      "name": "Level 2",
      "elevationM": 3.1,
      "floorToFloorHeightM": 2.9,
      "spaceCount": 20,
      "spacesCountingAsFloor": 10,
      "floorAreaSqm": 143.18,
      "ref": "ifc://Duplex_M_20111024_ROOMS_AND_SPACES.ifc#43"
    },
    {
      "id": "storey-roof",
      "name": "Roof",
      "elevationM": 6,
      "floorToFloorHeightM": 0,
      "spaceCount": 2,
      "spacesCountingAsFloor": 0,
      "floorAreaSqm": 0,
      "ref": "ifc://Duplex_M_20111024_ROOMS_AND_SPACES.ifc#47"
    }
  ],
  "spacesFile": "spaces.json",
  "roofs": [
    {
      "id": "roof-22492",
      "name": "Basic Roof:Live Roof over Wood Joist Flat Roof:184483",
      "family": "Basic Roof:Live Roof over Wood Joist Flat Roof",
      "elementType": "IfcSlab",
      "predefinedType": "ROOF",
      "basis": "IfcSlab.PredefinedType=ROOF",
      "storeyId": "storey-roof",
      "projectedSqm": 132.93,
      "upFacingProjectedSqm": 132.93,
      "tiltDeg": 0,
      "surfaceSqm": 132.93,
      "surfaceBasis": "upward faces of a closed solid",
      "partOf": "ifc://Duplex_A_20110907.ifc#22475",
      "ref": "ifc://Duplex_A_20110907.ifc#22492"
    }
  ],
  "groundSlabs": [
    {
      "id": "slab-5165",
      "name": "Floor:127mm Slab on Grade:141232",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 64.78,
      "countsAsGround": true,
      "evidence": "63.17 m² under 4 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#5165"
    },
    {
      "id": "slab-5267",
      "name": "Floor:127mm Slab on Grade:143106",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 64.91,
      "countsAsGround": true,
      "evidence": "63.17 m² under 4 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#5267"
    },
    {
      "id": "slab-21401",
      "name": "Floor:Finish Floor - Wood:170352",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 47.15,
      "countsAsGround": true,
      "evidence": "47.06 m² under 2 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#21401"
    },
    {
      "id": "slab-21449",
      "name": "Floor:Finish Floor - Ceramic Tile:170785",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 12.95,
      "countsAsGround": true,
      "evidence": "12.95 m² under 1 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#21449"
    },
    {
      "id": "slab-21497",
      "name": "Floor:Finish Floor - Ceramic Tile:171230",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 3.16,
      "countsAsGround": true,
      "evidence": "3.16 m² under 1 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#21497"
    },
    {
      "id": "slab-21545",
      "name": "Floor:Finish Floor - Ceramic Tile:171261",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 3.16,
      "countsAsGround": true,
      "evidence": "3.16 m² under 1 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#21545"
    },
    {
      "id": "slab-21610",
      "name": "Floor:Finish Floor - Wood:171292",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 47.15,
      "countsAsGround": true,
      "evidence": "47.06 m² under 2 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#21610"
    },
    {
      "id": "slab-21658",
      "name": "Floor:Finish Floor - Ceramic Tile:171444",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 12.95,
      "countsAsGround": true,
      "evidence": "12.95 m² under 1 conditioned space footprint(s)",
      "excludedReason": null,
      "ref": "ifc://Duplex_A_20110907.ifc#21658"
    },
    {
      "id": "slab-37777",
      "name": "Floor:150mm Exterior Slab on Grade:216507",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 25.42,
      "countsAsGround": false,
      "evidence": null,
      "excludedReason": "no conditioned space stands on it: no conditioned ground-storey footprint overlaps its shadow and no IfcRelSpaceBoundary names it",
      "ref": "ifc://Duplex_A_20110907.ifc#37777"
    },
    {
      "id": "slab-37864",
      "name": "Floor:150mm Exterior Slab on Grade:216552",
      "elementType": "IfcSlab",
      "predefinedType": "FLOOR",
      "storeyId": "storey-level-1",
      "projectedSqm": 25.42,
      "countsAsGround": false,
      "evidence": null,
      "excludedReason": "no conditioned space stands on it: no conditioned ground-storey footprint overlaps its shadow and no IfcRelSpaceBoundary names it",
      "ref": "ifc://Duplex_A_20110907.ifc#37864"
    }
  ],
  "openingsFile": "openings.json",
  "serviceLayers": [
    {
      "id": "hvac",
      "ko": "냉난방환기",
      "en": "HVAC",
      "file": "hvac.glb",
      "byteLength": 6587072,
      "triangleCount": 107482,
      "groups": [
        "duct",
        "valve",
        "terminal",
        "fitting",
        "plant",
        "duct-instanced",
        "valve-instanced",
        "terminal-instanced",
        "fitting-instanced",
        "plant-instanced"
      ],
      "elements": 924,
      "distinctGeometries": 709,
      "instancedShapes": 174,
      "instancedPlacements": 1180,
      "drawCalls": 179,
      "flow": {
        "file": null,
        "ports": 0,
        "connections": 0,
        "directedEdges": 0,
        "drawnEdges": 0,
        "bidirectionalEdges": 0,
        "unresolvedConnections": 0,
        "ungeometried": 0,
        "unreachedEdges": 0,
        "plantNodes": 0,
        "supplySegments": 0,
        "returnSegments": 0,
        "reason": "The model declares no distribution ports, so it states no network to trace.",
        "wavelengthM": null
      }
    },
    {
      "id": "electrical",
      "ko": "전기",
      "en": "Electrical",
      "file": "electrical.glb",
      "byteLength": 709764,
      "triangleCount": 9651,
      "groups": [
        "terminal",
        "plant",
        "valve-instanced",
        "terminal-instanced",
        "plant-instanced",
        "equipment-instanced"
      ],
      "elements": 100,
      "distinctGeometries": 60,
      "instancedShapes": 53,
      "instancedPlacements": 248,
      "drawCalls": 55,
      "flow": {
        "file": null,
        "ports": 0,
        "connections": 0,
        "directedEdges": 0,
        "drawnEdges": 0,
        "bidirectionalEdges": 0,
        "unresolvedConnections": 0,
        "ungeometried": 0,
        "unreachedEdges": 0,
        "plantNodes": 0,
        "supplySegments": 0,
        "returnSegments": 0,
        "reason": "The model declares no distribution ports, so it states no network to trace.",
        "wavelengthM": null
      }
    },
    {
      "id": "plumbing",
      "ko": "급탕/배관",
      "en": "Plumbing",
      "file": "plumbing.glb",
      "byteLength": 7744352,
      "triangleCount": 105497,
      "groups": [
        "duct",
        "valve",
        "fitting",
        "valve-instanced",
        "terminal-instanced",
        "fitting-instanced",
        "plant-instanced"
      ],
      "elements": 498,
      "distinctGeometries": 473,
      "instancedShapes": 155,
      "instancedPlacements": 681,
      "drawCalls": 158,
      "flow": {
        "file": "plumbing-flow.json",
        "ports": 970,
        "connections": 485,
        "directedEdges": 190,
        "drawnEdges": 190,
        "bidirectionalEdges": 295,
        "unresolvedConnections": 0,
        "ungeometried": 0,
        "unreachedEdges": 0,
        "plantNodes": 0,
        "supplySegments": 0,
        "returnSegments": 190,
        "reason": null,
        "wavelengthM": 26
      }
    }
  ],
  "model": {
    "file": "model.glb",
    "byteLength": 505884,
    "triangleCount": 7938,
    "groups": [
      "slab",
      "wall",
      "stair",
      "glazing",
      "door",
      "mullion"
    ],
    "note": "Building fabric only: walls, slabs, roofs and openings. Furniture, fixtures, railings and the structural frame are not in this file.",
    "serviceNote": "Service layers carry every component at the model's own geometry; a repeated shape is stored once and placed by instancing."
  },
  "invalidDiagnostics": {
    "note": "Space-boundary strip sums. INVALID as envelope areas: room-height not storey-height, gross of openings, double-counted where boundaries overlap, and blind to any wall without a resolvable boundary surface. Diagnostic only; never an emitted area.",
    "rawSumSqm": 600.42,
    "rawSumByElementType": {
      "IfcWallStandardCase": 456.582,
      "IfcDoor": 12.308,
      "IfcWindow": 63.57,
      "IfcWall": 67.96
    }
  },
  "architecturalDetails": {
    "id": "details",
    "ko": "건축 상세",
    "en": "Architectural details",
    "file": "architectural-details.glb",
    "byteLength": 647308,
    "sha256": "df0bb8731446834d710b14a5b6ce785ca4aa8d318395cb90292b99aa6282948f",
    "triangleCount": 12008,
    "placedTriangleCount": 18836,
    "triangleCountBasis": "triangleCount stores each instanced shape once; placedTriangleCount includes every placement",
    "groups": [
      "railing",
      "furnishing",
      "footing",
      "covering",
      "beam"
    ],
    "elements": 93,
    "distinctGeometries": 182,
    "instancedShapes": 11,
    "instancedPlacements": 70,
    "drawCalls": 20,
    "materials": 9,
    "sourceFiles": [
      {
        "role": "architectural",
        "fileName": "Duplex_A_20110907.ifc",
        "sha256": "b347a2c8aa8fff6db896a4417a9c50c22ac0ccd7c5cfc22b99b8d29336c606ed",
        "types": [
          {
            "type": "IfcFurnishingElement",
            "candidates": 61,
            "rendered": 61,
            "withoutRenderedMesh": 0
          },
          {
            "type": "IfcCovering",
            "candidates": 13,
            "rendered": 13,
            "withoutRenderedMesh": 0
          },
          {
            "type": "IfcRailing",
            "candidates": 4,
            "rendered": 4,
            "withoutRenderedMesh": 0
          },
          {
            "type": "IfcBeam",
            "candidates": 8,
            "rendered": 8,
            "withoutRenderedMesh": 0
          },
          {
            "type": "IfcFooting",
            "candidates": 7,
            "rendered": 7,
            "withoutRenderedMesh": 0
          }
        ]
      }
    ],
    "indexFile": "architectural-details-index.json",
    "indexSha256": "95c9bf729b0f6ae92121d40d48e1458e0dd423996a1b9cf51c6975ba9787086a",
    "appearance": "web-ifc tessellator RGBA, including possible default styles; no inferred finish textures. Metalness 0 and roughness 0.85 are renderer assumptions, not measured material properties.",
    "note": "Selected source IFC entity classes omitted from the core fabric layer. Original tessellated geometry and placements; repeated shapes use GPU instancing. Not a claim of complete architectural or fabrication detail. Existing services remain separate."
  },
  "mepCoverage": {
    "schemaVersion": 1,
    "status": "source_geometry_published",
    "publishedLayerIds": [
      "hvac",
      "electrical",
      "plumbing"
    ],
    "typedElementCount": 2010,
    "distributionPortCount": 970,
    "sources": [
      {
        "role": "architectural",
        "fileName": "Duplex_A_20110907.ifc",
        "sha256": "b347a2c8aa8fff6db896a4417a9c50c22ac0ccd7c5cfc22b99b8d29336c606ed",
        "schema": "IFC2X3",
        "typedElementCount": 0,
        "entitiesByType": {},
        "distributionPorts": 0,
        "systems": 0
      },
      {
        "role": "rooms",
        "fileName": "Duplex_M_20111024_ROOMS_AND_SPACES.ifc",
        "sha256": "3cd577ecff9daf91632789a408070251a431b198de7be47f64e01c7fda1be92b",
        "schema": "IFC2X3",
        "typedElementCount": 487,
        "entitiesByType": {
          "IfcEnergyConversionDevice": 22,
          "IfcFlowSegment": 246,
          "IfcFlowFitting": 207,
          "IfcFlowMovingDevice": 4,
          "IfcFlowController": 8
        },
        "distributionPorts": 0,
        "systems": 0
      },
      {
        "role": "hvac",
        "fileName": "Duplex_MEP_20110907.ifc",
        "sha256": "13976a8e223f177a6d7123679e4b02e750cd90c13f7bb20c593be125d9407119",
        "schema": "IFC2X3",
        "typedElementCount": 926,
        "entitiesByType": {
          "IfcEnergyConversionDevice": 16,
          "IfcFlowSegment": 427,
          "IfcFlowFitting": 358,
          "IfcFlowMovingDevice": 4,
          "IfcFlowTerminal": 105,
          "IfcFlowController": 14,
          "IfcDistributionControlElement": 2
        },
        "distributionPorts": 0,
        "systems": 0
      },
      {
        "role": "electrical",
        "fileName": "Duplex_Electrical_20121207.ifc",
        "sha256": "d47b014ed5b3428496683ee75e4664013f6df8237ea571b8d13f877cea0b7a94",
        "schema": "IFC2X3",
        "typedElementCount": 99,
        "entitiesByType": {
          "IfcEnergyConversionDevice": 2,
          "IfcFlowMovingDevice": 4,
          "IfcFlowTerminal": 82,
          "IfcFlowController": 8,
          "IfcDistributionControlElement": 3
        },
        "distributionPorts": 0,
        "systems": 0
      },
      {
        "role": "plumbing",
        "fileName": "Duplex_Plumbing_20121113.ifc",
        "sha256": "abfaf5c0979b6b4b05182aec7ada8945374bdb414db76c763724d549b41b212b",
        "schema": "IFC2X3",
        "typedElementCount": 498,
        "entitiesByType": {
          "IfcEnergyConversionDevice": 2,
          "IfcFlowMovingDevice": 2,
          "IfcFlowController": 20,
          "IfcFlowTerminal": 16,
          "IfcFlowFitting": 227,
          "IfcFlowSegment": 231
        },
        "distributionPorts": 970,
        "systems": 0
      }
    ],
    "summary": {
      "ko": "공개된 냉난방환기·전기·배관 IFC를 각각 표시합니다. 모델 간 중복 가능성이 있어 원본 요소 수를 설치 설비의 고유 개수로 해석하지 않습니다.",
      "en": "Published HVAC, electrical and plumbing IFCs are shown separately. Source occurrence counts can overlap between models and are not unique installed equipment counts."
    },
    "limitations": [
      {
        "ko": "해시로 고정된 IFC 파일에서 해당 스키마의 설비 분류 상속을 확인한 요소 목록이며, 실제 설치 설비의 완전성 조사가 아닙니다.",
        "en": "Inventory of distribution occurrence classes using each pinned IFC file's schema inheritance, not a completeness survey of installed services."
      },
      {
        "ko": "분야별·수정본 모델 간 요소가 중복될 수 있으며 파일 간 설비 중복 제거는 하지 않았습니다.",
        "en": "Counts include overlapping discipline and revision models; there is no cross-file equipment deduplication."
      },
      {
        "ko": "일반 IfcBuildingElementProxy·IfcFurnishingElement는 원본 근거 없이 MEP로 분류하지 않습니다.",
        "en": "Generic IfcBuildingElementProxy and IfcFurnishingElement occurrences are not classified as MEP without source evidence."
      },
      {
        "ko": "실·공간 IFC에도 별도 설비 표현이 있어 목록에 포함하되, 공개된 분야별 레이어 위에 겹쳐 표시하지 않습니다.",
        "en": "The rooms-and-spaces IFC also contains an alternative services representation; it is inventoried but not overlaid on the published discipline layers."
      }
    ]
  },
  "materialFabric": {
    "file": "material-fabric.glb",
    "byteLength": 170460,
    "sha256": "4f80915ec367a61423cb2faa44c6d187f9333bc02de244ae326a0a01eb2b40c0",
    "indexFile": "material-fabric-index.json",
    "indexSha256": "b86cc7ea76c1841fe5c573ed7fa259d3e63f6885d4b141b6955b9214e53b36f6",
    "elements": 122,
    "triangleCount": 7590,
    "placedTriangleCount": 7938,
    "drawCalls": 19,
    "bindings": [
      {
        "key": "slab__architectural_5244",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#5244",
        "materialRef": "ifc://Duplex_A_20110907.ifc#5245",
        "materialNames": [
          "Concrete"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38375",
        "basis": "occurrence",
        "assemblyName": "Floor:127mm Slab on Grade",
        "representativeLayer": {
          "name": "Concrete",
          "thicknessM": 0.127,
          "ref": "ifc://Duplex_A_20110907.ifc#5243"
        },
        "elements": 2
      },
      {
        "key": "slab__architectural_6222",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#6222",
        "materialRef": "ifc://Duplex_A_20110907.ifc#6223",
        "materialNames": [
          "Wood - Sheathing - plywood",
          "Wood - Dimensional Lumber"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38392",
        "basis": "occurrence",
        "assemblyName": "Floor:Residential - Wood Joist with Subflooring",
        "representativeLayer": {
          "name": "Wood - Dimensional Lumber",
          "thicknessM": 0.286,
          "ref": "ifc://Duplex_A_20110907.ifc#6221"
        },
        "elements": 2
      },
      {
        "key": "slab__architectural_20880",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#20880",
        "materialRef": "ifc://Duplex_A_20110907.ifc#20881",
        "materialNames": [
          "Wood - Flooring",
          "Insulation / Thermal Barriers - Semi-rigid insulation"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38394",
        "basis": "occurrence",
        "assemblyName": "Floor:Finish Floor - Wood",
        "representativeLayer": {
          "name": "Wood - Flooring",
          "thicknessM": 0.016,
          "ref": "ifc://Duplex_A_20110907.ifc#20870"
        },
        "elements": 8
      },
      {
        "key": "slab__architectural_21320",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#21320",
        "materialRef": "ifc://Duplex_A_20110907.ifc#21321",
        "materialNames": [
          "Ceramic Tile",
          "Masonry - Grout"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38400",
        "basis": "occurrence",
        "assemblyName": "Floor:Finish Floor - Ceramic Tile",
        "representativeLayer": {
          "name": "Ceramic Tile",
          "thicknessM": 0.01,
          "ref": "ifc://Duplex_A_20110907.ifc#21278"
        },
        "elements": 6
      },
      {
        "key": "slab__architectural_unassigned",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "unassigned",
        "assemblyRef": null,
        "materialNames": [],
        "relationRef": null,
        "basis": null,
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 1
      },
      {
        "key": "slab__architectural_37848",
        "group": "slab",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#37848",
        "materialRef": "ifc://Duplex_A_20110907.ifc#37849",
        "materialNames": [
          "Concrete - Cast In Situ"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38437",
        "basis": "occurrence",
        "assemblyName": "Floor:150mm Exterior Slab on Grade",
        "representativeLayer": {
          "name": "Concrete - Cast In Situ",
          "thicknessM": 0.15,
          "ref": "ifc://Duplex_A_20110907.ifc#37847"
        },
        "elements": 2
      },
      {
        "key": "wall__architectural_4202",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#4202",
        "materialRef": "ifc://Duplex_A_20110907.ifc#4203",
        "materialNames": [
          "Plasterboard",
          "Metal - Stud Layer",
          "Plasterboard"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38360",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Interior - Partition (92mm Stud)",
        "representativeLayer": {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.092,
          "ref": "ifc://Duplex_A_20110907.ifc#4200"
        },
        "elements": 18
      },
      {
        "key": "wall__architectural_4360",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#4360",
        "materialRef": "ifc://Duplex_A_20110907.ifc#4361",
        "materialNames": [
          "Plasterboard",
          "Metal - Stud Layer",
          "Masonry - Concrete Block",
          "Misc. Air Layers - Air Space",
          "Masonry - Concrete Block",
          "Metal - Stud Layer",
          "Plasterboard"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38362",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Party Wall - CMU Residential Unit Dimising Wall",
        "representativeLayer": {
          "name": "Masonry - Concrete Block",
          "thicknessM": 0.193,
          "ref": "ifc://Duplex_A_20110907.ifc#4355"
        },
        "elements": 4
      },
      {
        "key": "wall__architectural_4801",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#4801",
        "materialRef": "ifc://Duplex_A_20110907.ifc#4802",
        "materialNames": [
          "Concrete - Cast In Situ"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38368",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Foundation - Concrete (417mm)",
        "representativeLayer": {
          "name": "Concrete - Cast In Situ",
          "thicknessM": 0.417,
          "ref": "ifc://Duplex_A_20110907.ifc#4800"
        },
        "elements": 4
      },
      {
        "key": "wall__architectural_5040",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#5040",
        "materialRef": "ifc://Duplex_A_20110907.ifc#5041",
        "materialNames": [
          "Concrete - Cast In Situ"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38372",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Foundation - Concrete (435mm)",
        "representativeLayer": {
          "name": "Concrete - Cast In Situ",
          "thicknessM": 0.435,
          "ref": "ifc://Duplex_A_20110907.ifc#5039"
        },
        "elements": 3
      },
      {
        "key": "wall__architectural_5842",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#5842",
        "materialRef": "ifc://Duplex_A_20110907.ifc#5843",
        "materialNames": [
          "Plasterboard",
          "Metal - Stud Layer",
          "Plasterboard"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38385",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Interior - Plumbing (152mm Stud)",
        "representativeLayer": {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.152,
          "ref": "ifc://Duplex_A_20110907.ifc#5840"
        },
        "elements": 2
      },
      {
        "key": "wall__architectural_3982",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#3982",
        "materialRef": "ifc://Duplex_A_20110907.ifc#4027",
        "materialNames": [
          "Masonry - Brick",
          "Misc. Air Layers - Air Space",
          "Insulation / Thermal Barriers - Rigid insulation",
          "Masonry - Concrete Block",
          "Metal - Stud Layer",
          "Plasterboard"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38357",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Exterior - Brick on Block",
        "representativeLayer": {
          "name": "Masonry - Concrete Block",
          "thicknessM": 0.193,
          "ref": "ifc://Duplex_A_20110907.ifc#3931"
        },
        "elements": 12
      },
      {
        "key": "wall__architectural_24663",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#24663",
        "materialRef": "ifc://Duplex_A_20110907.ifc#24664",
        "materialNames": [
          "Metal - Stud Layer",
          "Plasterboard"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38426",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Interior - Furring (152 mm Stud)",
        "representativeLayer": {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.136,
          "ref": "ifc://Duplex_A_20110907.ifc#24661"
        },
        "elements": 6
      },
      {
        "key": "wall__architectural_37953",
        "group": "wall",
        "sourceRole": "architectural",
        "status": "layer_set",
        "assemblyRef": "ifc://Duplex_A_20110907.ifc#37953",
        "materialRef": "ifc://Duplex_A_20110907.ifc#37954",
        "materialNames": [
          "Metal - Stud Layer",
          "Plasterboard"
        ],
        "relationRef": "ifc://Duplex_A_20110907.ifc#38439",
        "basis": "occurrence",
        "assemblyName": "Basic Wall:Interior - Furring (38 mm Stud)",
        "representativeLayer": {
          "name": "Metal - Stud Layer",
          "thicknessM": 0.038,
          "ref": "ifc://Duplex_A_20110907.ifc#37951"
        },
        "elements": 8
      },
      {
        "key": "stair__architectural_unassigned",
        "group": "stair",
        "sourceRole": "architectural",
        "status": "unassigned",
        "assemblyRef": null,
        "materialNames": [],
        "relationRef": null,
        "basis": null,
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 2
      },
      {
        "key": "glazing__architectural_unassigned",
        "group": "glazing",
        "sourceRole": "architectural",
        "status": "unassigned",
        "assemblyRef": null,
        "materialNames": [],
        "relationRef": null,
        "basis": null,
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 24
      },
      {
        "key": "door__architectural_unassigned",
        "group": "door",
        "sourceRole": "architectural",
        "status": "unassigned",
        "assemblyRef": null,
        "materialNames": [],
        "relationRef": null,
        "basis": null,
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 14
      },
      {
        "key": "mullion__architectural_unassigned",
        "group": "mullion",
        "sourceRole": "architectural",
        "status": "unassigned",
        "assemblyRef": null,
        "materialNames": [],
        "relationRef": null,
        "basis": null,
        "assemblyName": null,
        "representativeLayer": null,
        "elements": 4
      }
    ],
    "appearanceBasis": "IFC occurrence or type material association. For a layer set, the thickest stated layer is used as an illustrative representative, not as the verified exterior finish. Source layer order does not establish installation direction. Unreviewed material names remain neutral. Glazing retains its base role appearance."
  }
}