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RdSAP 10 §5.17 / Table 23. `wall_is_basement` is not a lodged U-value — it is a disambiguation flag selecting WHICH RdSAP default applies, so unlike wall/roof/floor_u_value it must survive the round-trip. Code 6 is canonically SYSTEM-BUILT and the gov-API path infers "basement" from a code-6 heuristic; the Elmhurst site-notes mapper sets wall_is_basement=False precisely to defeat it. Dropping the field inverted the answer — a system-built wall came back as a basement wall, dragging the whole ground floor onto the Table 23 basement-floor U-value via `has_basement`. Declared on no RdSAP schema, so it never arrives via the gov API; the earlier corpus scan showing 0 occurrences measured the wrong population. The Elmhurst site-notes path sets it and those EPCs are persisted (scripts/wchg_elmhurst_ingest.py). Nullable is load-bearing: None = "not stated, use the heuristic", False = "explicitly system-built, do not". Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com> |
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| baseline-downgrade-followups.md | ||
| HANDOVER_API_ACCURACY_S2.md | ||
| HANDOVER_API_FETCH_AND_REPORT.md | ||
| HANDOVER_API_PROFILING.md | ||
| HANDOVER_ARA_NEXT.md | ||
| HANDOVER_EPC_PREDICTION.md | ||
| HANDOVER_EPC_PREDICTION_WIRING.md | ||
| HANDOVER_MODELLING.md | ||
| HANDOVER_NEXT_PHASE_PROMPT.md | ||
| HANDOVER_PASHUB_838_PROBLEM_PROPERTIES.md | ||
| HANDOVER_PASHUB_EXTRACTOR_ACCURACY.md | ||
| HANDOVER_REAL_LIFE_CERT_ACCURACY.md | ||
| HANDOVER_SUMMARY_AUDIT.md | ||
| MIGRATION_NOTE_predicted_epc_source.md | ||
| PR_NOTE_system_built_basement_1177.md | ||