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A SOLID-BRICK or STONE wall lodging External/Internal insulation (wall_insulation_type 1/3) but no measured insulation thickness (gov-API "NI" -> None) was billed at its UNINSULATED §5.6/Table-6 U-value: the §5.8 added-insulation R-value adjustment gates on `insulation_thickness_mm > 0`, so an unknown thickness fell straight through to the raw solid-wall U (~1.4-1.7). This over-counted wall heat loss and under-rated the dwelling. RdSAP 10 §5.4 (PDF p.32): "the U-value with additional insulation is based on the thickness of insulation of mineral wool type (assume 100 mm if thickness is unknown)". Apply that 100 mm default so the §5.8 Table-14 R-value fires. Scoped to solid brick / stone (the only constructions with a §5.8 R-value path in u_wall) so cavity (composite path) and timber / system-built walls are untouched. Localised by deep-diving corpus cert 200004296092 (end-terrace, solid brick 360 mm "with external insulation", NI): walls 101.7 W/K (U~1.40, HLP 3.46 = absurd for an insulated wall) -> ~0.29; PE +59.6 -> ~0; engine 64.35 (Δ -6.65) -> 71.74 = lodged 71. ~8 solid-brick/stone corpus certs carry this NI-thickness-with-insulation shape. Gauge: within-0.5 held at 77.0%, SAP MAE 0.658 -> 0.647, CO2 0.074 -> 0.073, PE 3.2 -> 3.1 (floor ratcheted). Unit-pinned in test_rdsap_uvalues (brick 360 mm external NI -> 0.29) + RealCertExpectation 200004296092 = 72. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> |
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| .. | ||
| addresses | ||
| billing | ||
| data_transformation | ||
| epc | ||
| epc_prediction | ||
| fuel_rates | ||
| magicplan | ||
| modelling | ||
| property | ||
| property_baseline | ||
| sap10_calculator | ||
| tasks | ||
| __init__.py | ||
| test_building_geometry.py | ||
| test_postcode.py | ||