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CLASS-12: Roof + Ceiling decoders + IfcRoof / IfcCovering emission #92

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CLASS-12: Roof + Ceiling decoders + IfcRoof / IfcCovering emission#92
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area:elementsWork in the elements area.area:ifcWork in the ifc area.area:partitionsWork in the partitions area.priority:P2Important quality, usability, or hardening work.type:featureNew product or library capability.
Milestone
0.4.0: IFC geometry beta
@DrunkOnJava

Description

@DrunkOnJava
DrunkOnJava
opened on May 23, 2026

Problem

Roofs and ceilings are not yet decoded. CHANGELOG [0.2.0] entry
#79 added a "Roof tiebreaker" tuple disambiguation but no Roof
class is yet emitted. Ceilings have no path at all.

Scope

  • Identify Roof + Ceiling ElemTable tuples.
  • Roof: boundary profile + pitch + thickness -> sloped extrusion
    -> IFCROOF.
  • Ceiling: boundary profile + level offset -> planar extrusion
    -> IFCCOVERING with PredefinedType=.CEILING.
  • Material associations (per RE-15-08 pattern for walls).

Acceptance criteria

  • At least 1 IFCROOF entity emitted per corpus file with roofs.
  • At least 5 IFCCOVERING(CEILING) entities per file with
    ceilings.
  • Per-storey routing correct (roofs/ceilings nested under right
    storey).

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    area:elementsWork in the elements area.area:ifcWork in the ifc area.area:partitionsWork in the partitions area.priority:P2Important quality, usability, or hardening work.type:featureNew product or library capability.

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