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Jun-te Kim 0e784cbb1c test(accuracy): ratchet SAP MAE 0.658 -> 0.647 via wall added-insulation unknown-thickness default 
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>
2026-07-02 20:24:56 +00:00
..
CEPC-7.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
CEPC-7.1 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
CEPC-8.0.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
RdSAP-Schema-17.0 Map RdSAP-Schema-17.0 certs to EpcPropertyData 🟥 2026-06-12 12:40:04 +00:00
RdSAP-Schema-17.1 Dispatch and map RdSAP-Schema-18.0 certs end-to-end 🟥 2026-06-11 11:12:53 +00:00
RdSAP-Schema-18.0 Dispatch and map RdSAP-Schema-18.0 certs end-to-end 🟥 2026-06-11 11:12:53 +00:00
RdSAP-Schema-19.0 Map RdSAP-Schema-19.0 certs to EpcPropertyData 🟥 2026-06-12 12:19:16 +00:00
RdSAP-Schema-20.0.0 added test for a 1000 examples 2026-06-09 16:02:21 +00:00
RdSAP-Schema-21.0.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
RdSAP-Schema-21.0.1 added test for a 1000 examples 2026-06-09 16:02:21 +00:00
real_life_examples test(accuracy): ratchet SAP MAE 0.658 -> 0.647 via wall added-insulation unknown-thickness default 2026-07-02 20:24:56 +00:00
SAP-Schema-16.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-16.1 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-16.2 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-16.3 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-17.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-17.1 inviestigation with hyde values 2026-06-15 12:13:11 +00:00
SAP-Schema-18.0.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-19.0.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-19.1.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00
SAP-Schema-19.2.0 adding hacky handling for matching on lmk key or uprn 2026-04-09 14:47:54 +01:00