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RdSAP 10 §5.6 (PDF p.40) "U-values of uninsulated stone walls, age
bands A to E":
Table 12 — Default U-values of stone walls
Sandstone or limestone: U = 54.876 × W^(-0.561)
Granite or whinstone: U = 45.315 × W^(-0.513)
Where W is wall thickness in mm.
"Apply the adjustment according to Table 14: Insulation thickness
and corresponding resistance if wall is insulated or dry-lined
including lath and plaster."
Combined with §5.8 (PDF p.40) + Table 14 (PDF p.41) dry-line R = 0.17
m²K/W: U = 1 / (1/U₀ + 0.17).
Cert 000565 BP[0] Main alt1 is the cohort fixture: Stone Granite, age
band A (inherited from Main), 120 mm wall thickness, dry-lined.
§5.6 formula: U₀ = 45.315 × 120^(-0.513) ≈ 3.8871.
§5.8 + Table 14 dry-line: U = 1/(1/3.8871 + 0.17) ≈ **2.3405**.
→ matches worksheet U985-0001-000565 line (29a) "External walls Main
alt.1 ... SolidWallDensePlasterInsul, Solid, 0.0, 2.34" EXACT.
Pre-S0380.86 two coupled bugs blocked this path:
1. Mapper mis-name per [[feedback-no-misleading-insulation-type]]:
`_map_elmhurst_alternative_wall` routed the Elmhurst Summary §7
"Alternative Wall N Thickness" lodging (the WALL thickness)
onto `SapAlternativeWall.wall_insulation_thickness="120"`. The
cascade then mis-bucketed it as 100 mm insulation (bucket=100
→ _BRICK_INS_100 row at age A → U=0.32). The Elmhurst Summary
schema has no "Alternative Wall N Insulation Thickness" line at
all — `wall_insulation_thickness` on alts was always
semantically the wall thickness, never insulation.
2. `u_wall` had no §5.6 thin-wall stone branch. Stone constructions
fell through to Table 6 row values (designed for typical-
thickness ~300mm+ walls), which dramatically under-state heat
loss for sub-200mm stone.
Fix span:
- datatypes/epc/domain/epc_property_data.py:SapAlternativeWall:
new `wall_thickness_mm: Optional[int] = None` field, mirroring
`SapBuildingPart.wall_thickness_mm`.
- datatypes/epc/domain/mapper.py:_map_elmhurst_alternative_wall:
routes Elmhurst `a.thickness_mm` (Wall thickness) onto
`wall_thickness_mm`; leaves `wall_insulation_thickness=None`
on this path (no Elmhurst Summary alt-wall insulation-thickness
line exists).
- domain/sap10_ml/rdsap_uvalues.py:
new `_u_stone_thin_wall_age_a_to_e(construction, W)` helper
implements §5.6 Table 12 formulas. `u_wall` accepts a new
`wall_thickness_mm: Optional[int] = None` param; dispatches
§5.6 formula when (a) wall thickness lodged, (b) age band ∈
A-E, (c) construction ∈ {STONE_GRANITE, STONE_SANDSTONE}.
§5.8 + Table 14 R=0.17 applied on top when dry_lined=True.
- domain/sap10_calculator/worksheet/heat_transmission.py:
`_alt_wall_contribution_w_per_k` passes
`wall_thickness_mm=alt_wall.wall_thickness_mm` to `u_wall`.
Tests (7 new, AAA-structure):
- 5 in domain/sap10_ml/tests/test_rdsap_uvalues.py — granite at
120 mm with dry-line (U=2.34); granite raw formula (U=3.89);
sandstone (U=3.74); age-G gate (Table 6 row, NOT formula); no
wall_thickness fallback (Table 6 row 1.7).
- 2 in backend/documents_parser/tests/test_summary_pdf_mapper_chain
.py — mapper pin (wall_thickness_mm=120 on BP[0] alt1;
wall_insulation_thickness=None) and cascade pin (walls_w_per_k
≥ 595, post-S0380.85 was 555.93).
**Cert 000565 cascade walls: 555.93 → 602.40 W/K (worksheet 604.07;
0.27% residual).** BP[0] alt1 cascade U: 0.32 → 2.34. Cascade walls
within 2 W/K of worksheet target across S0380.85+.86 closure cycle.
Test baseline: 560 pass (was 558 + 7 new − 5 already passing pins
that moved) + 9 expected `test_sap_result_pin[000565-*]` fails
unchanged. Cohort + golden + cert 9501 unaffected: of the 6 cohort
fixtures only cert 000565 alt1 lodged a `wall_insulation_thickness`
value on `SapAlternativeWall` (audit confirmed) — and that value was
always semantically the wall thickness, so the rename is a fix not
a behaviour change. The API mapper path defaults `wall_thickness_mm`
to None (API schema doesn't yet surface alt-wall thickness; safe
forward-compat).
Per [[feedback-verify-handover-claims]]: the post-S0380.84 handover
predicted SH residual would close after the wall fixes. Empirically
SH grew +2591 → +6348 → +7924 across S0380.84/.85/.86 — confirming a
SEPARATE SH-channel over-count that's independent of fabric (each
+1 W/K of spec-correct walls adds ~33.5 kWh of cascade SH, vs the
worksheet's ~38.96 kWh/W/K rate). The walls fixes are spec-correct;
the SH over-count is now a single isolated open work-item for the
next slice (~+8 k kWh structural).
Pyright net-zero per touched file (test_rdsap_uvalues.py error count
actually decreased by 1).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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|---|---|---|
| .. | ||
| handler | ||
| tests | ||
| __init__.py | ||
| db_writer.py | ||
| elmhurst_extractor.py | ||
| extractor.py | ||
| local_runner.py | ||
| parser.py | ||
| pdf.py | ||