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Golden cert 0390-2954-3640 (detached, TFA 360, age F) carried a +7 SAP / -28 kWh/m² PE residual the audit attributed to a demand-side fabric gap. Walking the §3 cascade localised it to the Main wall: lodged wall_construction=4 (cavity), wall_insulation_type=4 (as-built / assumed), description "Cavity wall, as built, partial insulation (assumed)". The cascade mis-routed it to the Table 6 "Filled cavity" row (band F = 0.40) because `_described_as_insulated` matches the "partial insulation" substring. RdSAP 10 Specification (10-06-2025) Table 6 — Wall U-values, England distinguishes two cavity rows: "Cavity as built" A-E 1.5, F 1.0, G 0.60, H 0.60, I 0.45, J 0.35, ... "Filled cavity" A-E 0.7, F 0.40, G 0.35, H 0.35, I 0.45†, J 0.35†, ... An "as built ... partial insulation (assumed)" cavity is the as-built partial fill of the age band, NOT a retrofit cavity fill (a genuine fill lodges the distinct "Cavity wall, filled cavity", wall_insulation_type=2). It therefore routes to "Cavity as built" (band F = 1.0), mirroring the worksheet-validated solid-brick rule in S0380.209 (cases 9/10: "as built, insulated (assumed)" → as-built age-band row, not retrofit). New `_cavity_described_as_filled` predicate is used only in u_wall's cavity filled-row branch; it excludes the "partial insulation" substring while keeping "insulated (assumed)" → filled (the unrelated, separately asserted test_cavity_as_built_insulated_assumed_uses_filled_cavity_row is unchanged). The shared `_described_as_insulated` (also consumed by the roof/floor paths) is left untouched. Wall HLC +53.6 W/K (U 0.40 → 1.0 over ~268 m²) lifts all four metrics together — the signature of a real fabric bug, not a tuned offset: SAP +7 → +0 PE -27.9745 → +0.5281 kWh/m² CO2 -2.7134 → -0.1189 t/yr Bands I-M are unaffected (the two rows coincide per the † footnote), so golden certs 0535 (band M) / 7536 (band L) with "insulated (assumed)" cavities continue to pin at 0. Full suite 2384 passed, 1 skipped. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| .. | ||
| addresses | ||
| data_transformation | ||
| epc | ||
| fuel_rates | ||
| geospatial | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| sap10_ml | ||
| tasks | ||
| postcode.py | ||