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RdSAP 10 §3.8 "Roof area" spec:
"Roof area is the greatest of the floor areas on each level...
In the case of a pitched roof with a sloping ceiling, divide the
area so obtained by cos(30°)."
The cascade previously used `top_floor_area_m2` (horizontal projection)
verbatim for the roof area calculation — correct for flat roofs and
pitched-with-loft (where assessors measure on the horizontal), but
~15% under-area for PS pitched-sloping-ceiling roofs (1/cos(30°) =
1.1547). For cert 001479 Ext1 + Ext2 (both PS sloping ceiling):
Ext1: cascade 5.37 m² × 0.15 = 0.81 W/K
worksheet 6.20 m² × 0.15 = 0.93 W/K (delta -0.12)
Ext2: cascade 1.92 m² × 2.30 = 4.42 W/K
worksheet 2.22 m² × 2.30 = 5.11 W/K (delta -0.69)
Total roof W/K shortfall: -0.81
Fix: detect PS pitched-sloping-ceiling roofs via `bp.roof_construction
_type` (string lodgement from the Summary §8 "Roof Type" line) and
apply the 1/cos(30°) inclination factor before rounding the gross
roof area.
Schema addition: `SapBuildingPart.roof_construction_type: Optional[
str] = None` mirrors the existing `floor_construction_type`. Mapper
populates it via `_strip_code(roof.roof_type)` for both Main and
Extension bps — the Elmhurst Summary lodges the roof type
explicitly (e.g. "PS Pitched, sloping ceiling" / "PA Pitched (slates
/tiles), access to loft" / "Flat").
**Result: cert 001479 Summary → mapper → cascade now lands at SAP
69.0094 EXACT (delta -0.0000) — Layer 2 GREEN at 1e-4.** Full fabric
breakdown matches the worksheet exactly:
fabric_heat_loss = 139.4957 W/K ✓
walls = 39.7652 ✓ party = 17.0700 ✓
roof = 10.3438 ✓ floor = 23.1705 ✓
windows = 43.5962 ✓ doors = 5.5500 ✓
Layer 2 status across the 7 cert chain tests:
000477 GREEN (was GREEN)
000516 GREEN (was GREEN)
001479 GREEN (new — was +1.19 before Slice 87)
000474 RED -0.7524 (Elmhurst (12) non-spec — orthogonal)
000480 RED -1.0273 (Elmhurst (12) non-spec — orthogonal)
000487 RED +0.4834 (Elmhurst (12) non-spec — orthogonal)
000490 RED -1.1042 (Elmhurst (12) non-spec — orthogonal)
Cohort cascade pins remain GREEN (66 of 66) — hand-built fixtures
have roof_construction_type=None (default) so the new code path is
inert for them; their roofs use RR detailed_surfaces with explicit
areas already.
Pyright net-zero on every touched file (heat_transmission 13 → 13,
mapper 35 → 35, epc_property_data 0 → 0).
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| .. | ||
| epc | ||
| magicplan | ||
| __init__.py | ||
| datatypes.py | ||
| enums.py | ||