Khalim Conn-Kowlessar b6ebcad54d Slice S0380.91: party-wall Cavity-masonry-filled U=0.2 (RdSAP 10 Table 15 row 3) ... RdSAP 10 §5.10 Table 15 (PDF p.42) "U-values of party walls": Party wall type U --------------------------------------------- ---- Solid masonry / timber frame / system built 0.0 Cavity masonry unfilled 0.5 Cavity masonry filled 0.2 Unable to determine, house or bungalow 0.25 Unable to determine, flat or maisonette* 0.0 Pre-slice the cascade collapsed CF (Cavity masonry filled) into the same SAP10 wall_construction code 4 as CU (Cavity masonry unfilled), so the filled-cavity row's spec U=0.2 was silently rounded up to the unfilled U=0.5. The mapper at `_ELMHURST_PARTY_WALL_CODE_TO_SAP10["CF"]: 4` and `_API_PARTY_WALL_CONSTRUCTION_TO_SAP10[3]: 4` both flagged this as a known approximation since S0380.64; today's slice closes it. Introduces a party-wall-only synthetic SAP10 code `WALL_CAVITY_FILLED_PARTY = 11` (distinct from the main wall_construction codes 1-10 since Table 15 treats filled vs unfilled cavity as separate party-wall types). `u_wall` doesn't consume code 11 so main-wall U-value cascades are unaffected. Cohort + golden audit: only cert 000565 Ext1 lodges CF on the Elmhurst side; zero golden certs lodge API code 3, so flipping the dispatch is scoped to one BP. Cert 000565 movement (HEAD edb1e6b8 → this slice): - cascade party_walls_w_per_k: 93.255 → 65.13 ✓ EXACT vs worksheet 65.13 - sap_score (integer): 27 → 28 (Δ−2 → Δ−1) - sap_score_continuous: 27.3534 → 27.9893 (Δ−1.16 → Δ−0.52) - space_heating_kwh: 60468.18 → 59639.74 (Δ+1460 → Δ+631; 57% closed) - main_heating_fuel_kwh: 35569.52 → 35082.20 (Δ+859 → Δ+371; 57% closed) - co2_kg_per_yr: 6581.12 → 6506.48 (Δ+133 → Δ+59) - total_fuel_cost_gbp: 4784.29 → 4726.75 (Δ+104 → Δ+46) - hot_water_kwh: 3755.03 ✓ EXACT unchanged - lighting / pumps_fans: sub-spec residuals unchanged Continuous SAP at 27.9893 is 0.51 below the 28.5 rounding-up threshold; the remaining +631 SH residual (ventilation +27 W/K + doors missing +21 W/K + downstream) pushes integer score to 29 once those land. Cohort + 9 golden API + 38 cohort-2 API + 6 U985 Elmhurst certs all unaffected (no CF lodgements; party_wall_construction=4 still routes to 0.5 for CU). Existing `test_u_party_wall_unfilled_cavity_returns_table15 _value` regression-guards code 4 stays at U=0.5. Test baseline: 575 pass + 9 expected `000565` fails (was 574 + 9, +1 net new cascade pin test). 105/105 pass in `test_rdsap_uvalues.py` including new CF unit test. Pyright net-zero per touched file (baseline 1/65/32/13 preserved). 3 pre-existing failures in adjacent test files (test_heat_ transmission roof + basement, test_from_rdsap_schema floor_area) unchanged. Per [[project-sap10_ml-deprecation]] the synthetic code constant lives alongside its consumer `u_party_wall` in `domain/sap10_ml/rdsap_uvalues.py` (editing the existing file). When the deprecation migration moves `rdsap_uvalues.py` to `domain/sap10_calculator/`, `WALL_CAVITY_FILLED_ PARTY` moves with it. Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>		2026-06-01 16:28:47 +00:00
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epc	Slice S0380.91: party-wall Cavity-masonry-filled U=0.2 (RdSAP 10 Table 15 row 3)	2026-06-01 16:28:47 +00:00
magicplan	typing and renaming 🟪	2026-05-07 13:26:49 +00:00
__init__.py	further breaking up code	2023-07-20 12:24:34 +01:00
datatypes.py	further breaking up code	2023-07-20 12:24:34 +01:00
enums.py	completed build of new demo portfolio - some fixed required still	2023-11-20 14:42:16 +00:00