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Khalim Conn-Kowlessar 8741fbdfac fix(floor): floor_heat_loss=3 → above partially heated space, U=0.7 (RdSAP §3.12) 
The API `floor_heat_loss` code is authoritative — confirmed by joining each
single-BP cert's code to its independent `floors[].description` (which the
gov register publishes alongside the code):

  code 1 ↔ "To external air"        (exposed,        9/9)
  code 2 ↔ "To unheated space"      (semi-exposed,   6/6)
  code 3 ↔ "(other premises below)" (partially htd,  9/9)
  code 6 ↔ "(another dwelling below)" (party,      176/176)
  code 7 ↔ "Solid"/"Suspended …"    (ground,     all)

Code 3 was mis-mapped to "To unheated space" (semi-exposed) and, on
mid-/top-floor flats, had its floor area zeroed entirely by the
dwelling-level exposure heuristic. RdSAP 10 §3.12 (PDF p.25) classes a
flat's floor over non-domestic "other premises … heated, but at different
times" as "above a partially heated space" → the §5.14 (PDF p.47) constant
U=0.7 W/m²K — distinct from semi-exposed (Table 20) and party (no loss).

Fix: the mapper sets `is_above_partially_heated_space` on the floor=0
dimension for code 3 (string → "(other premises below)" for fidelity), and
the heat-transmission step lets that per-BP lodgement override the flat
suppression upward (mirroring the existing exposed / "another dwelling
below" overrides). The cascade already routes is_above_partial → U=0.7.

Re-pins golden cert 7536-3827: its Ext2 (bp3) lodges code 3, but the cert's
lossy `floors[]` summary dropped that description, so a prior agent guessed
"code 3 = ground" (U=1.12) and concluded the residual was an irreducible
"register-rounding" artifact. It was this bug: Ext2 floor U 1.12 → 0.70,
PE -6.1952 → -5.6414, CO2 -0.1639 → -0.1492 (both toward 0), SAP unchanged.

Eval: 909 computed, 45.1% → 45.3% within 0.5, mean|err| 1.702 → 1.659,
<1.0 59.5% → 60.2%. 13 code-3 certs improve (0380 +3.71 → -0.63, 0350
+7.82 → +0.83, 2610 +7.47 → -1.29); the few that overshoot were already
failing and carry independent fabric bugs (9763's walls = 8 W/K for 60 m²).

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-06-07 22:25:04 +00:00
..
domain fix(floor): floor_heat_loss=3 → above partially heated space, U=0.7 (RdSAP §3.12) 2026-06-07 22:25:04 +00:00
loaders demo generated for use in address2uprn 2026-05-08 14:48:15 +00:00
schema fix(mapper): read sloping_ceiling_insulation_thickness for roof code 8 2026-06-06 17:37:17 +00:00
search bolstering testing 2026-04-28 13:46:09 +00:00
surveys S0380.234: PV diverter (Appendix G4) — diverts surplus PV to the cylinder 2026-06-04 22:59:12 +00:00
__init__.py testing out rebaselining 2026-02-12 22:25:03 +00:00
construction_age_band.py testing out rebaselining 2026-02-12 22:25:03 +00:00
efficiency.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
floor.py preparing partiy class 2026-02-05 08:54:27 +00:00
fuel.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
heating_controls.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
hotwater.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
main_heating.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
property_type_built_form.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
roof.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
walls.py beginning to assembly the parity class 2026-02-04 18:34:59 +00:00
windows.py testing out rebaselining 2026-02-12 22:25:03 +00:00