{
  "revision": "VIS-03",
  "date": "2026-09-27",
  "status": "DESIGN / VERIFICATION OPEN — NOT CONSTRUCTION RELEASED",
  "revision_note": "VIS-03 — geometry/material coordination revision based on latest fireplace/hearth dimensions and confirmed Durham Hickory II flooring; supersedes VIS-02 for design geometry while retaining VIS-02 room/context reference.",
  "canonical_url": "https://fireplace.tangentforge.com/#dimensions",
  "confirmed": {
    "existing_face_in": {
      "width": 64,
      "height": 94
    },
    "existing_opening_in": {
      "width": 46.125,
      "height": 26.75
    },
    "floor_product": "American Spirit Durham Hickory II, hand-scraped engineered hardwood",
    "floor_sku": "100598689",
    "stone_product": "River Canyon Natural Marble Ledger Panel",
    "stone_sku": "101022556"
  },
  "owner_gc_direction": {
    "finished_face_from_original_wall_in": [
      12,
      13
    ],
    "mantel_beyond_finished_face_in": 8,
    "mantel_width": "Full fireplace-wall width; exact field span TBD",
    "mantel_material": "Custom dark floating metal",
    "hearth_base_in": {
      "width": 79,
      "depth_from_original_wall": 18
    },
    "hearth_cap_in": {
      "width": 81,
      "depth_from_original_wall": 19
    },
    "hearth_cap_approximate": true,
    "hearth_height_in": null,
    "hearth_height_reference_only_in": [
      2,
      3
    ]
  },
  "derived_coordination_only": {
    "mantel_leading_edge_from_original_wall_in": [
      20,
      21
    ],
    "cap_beyond_finished_face_in": [
      6,
      7
    ],
    "base_beyond_finished_face_in": [
      5,
      6
    ],
    "mantel_beyond_cap_in": [
      1,
      2
    ],
    "cap_side_and_front_overhang_in": 1
  },
  "field_verify": [
    "Exact fireplace-wall width and mantel endpoint conditions",
    "Final forward face width/height, ceiling pitch and top scribe; 64 × 94 is existing reference",
    "Exact finished face depth within 12–13 in and component build-up",
    "Mantel thickness, elevation, window-glazing/trim conflict, finish, fabricator, structural attachment/backing and loads",
    "Hearth height TBD; 2 or 3 in reference only, not released; cap thickness, material, joints and support TBD",
    "Firebox datum, actual recession, return depth, opening transition and permitted overlap",
    "Heatilator data plate, exact model/suffix, installed gas equipment identification and applicable manuals/clearances",
    "Gas key/shutoff access, service removal paths, chimney/enclosure air spaces and circulation clearance",
    "Existing trim profile, height, thickness, paint and physical sample match"
  ],
  "references": {
    "room_geometry": "VIS-02 board front and angled panels; old geometry/material inset superseded",
    "stone_photo": "assets/actual-stone-sample.webp; larger lower stones in actual photo",
    "floor_photo": "IMG_0927.jpeg",
    "floor_label": "IMG_0928.jpeg",
    "trim_photo": "IMG_0737.jpeg; corroborated by IMG_0734.jpeg and IMG_0739.jpeg",
    "trim_status": "Existing appearance photographed; exact profile/dimensions not verified",
    "mantel_sample_status": "Dark metal owner/GC direction; no approved physical finish sample established"
  },
  "manual_gate": "Heatilator HD42 family is a working identification only. Verify data plate and exact suffix, documents 12955 (4-14-88), 12063 (6-6-88), and installed gas equipment listing. No conceptual dimension overrides applicable manufacturer clearances, service/gas access, structural backing or field measurements."
}