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Implements RdSAP10 §3.9.1 Simplified Type 1 (True Room-in-Roof, no
common walls):
A_RR = 12.5 × √(A_RR_floor / 1.5)
When the cert lodges only a `SapRoomInRoof(floor_area, construction_
age_band)` (no gable / party / sheltered / connected wall lengths),
ΣA_RR_gable/other = 0 → A_RR_final = A_RR, treated as timber-framed
roof structure with U from Table 18 col (4) "Room-in-roof, all elements".
The storey-below roof area (§3.8) is deducted by A_RR_floor per §3.9.
Changes:
- `_part_geometry`: returns new keys `rr_floor_area_m2` and
`rr_simplified_a_rr_m2`; existing `top_floor_area_m2` now subtracts
`rr_floor_area_m2` (the §3.9 deduction).
- Main loop: `roof += U_RR × A_RR` where U_RR is from
`u_rr_default_all_elements(country, rir.construction_age_band)`.
A_RR also joins the (31) external-area total for thermal-bridging.
Test: synthetic 2-storey + RR (15 m² floor) at age B → roof_w_per_k
math closes at abs=0.001 vs hand-computed 100.92 W/K.
Cohort impact (post-slice-11 vs post-slice-8):
- 000474, 000490 unchanged at Δ=0 ✓
- 000480: Δ=+12 → +4 (RR Simplified resolved most of the gap)
- 000487: Δ=+11 → +3 (same)
- 000516: Δ=+12 → +4 (same)
- 000477: Δ=+2 → −6 (overshoot — the U985 PDF uses detailed §3.10
per-surface RR lodgement; Simplified Type 1 at U=2.30 is too high
for an RR with measured retrofit insulation. Closes once Detailed
lands + 000477 fixture upgrades to detailed lodgement, slice 14.)
Reference: RdSAP 10 (10-06-2025) §3.9.1 page 21-22; Table 18 page 45.
Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>
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| pyproject.toml | ||
| README.md | ||
domna-domain
Shared domain types — Property, Properties, BaselinePerformance, Plan, PlanPhase, Scenario, ScenarioPhase, ScenarioSnapshot, Recommendation, OptimisedPackage, EpcPropertyData, etc.
Boundary: types only. No persistence, no IO, no business logic. Other packages and services depend on domna-domain; this package depends on nothing internal.
Domain definitions live in ../../CONTEXT.md. New types added here must match the glossary terms.
Layout
src/domain/
├── __init__.py
├── property.py # Property, Properties, PropertyIdentity
├── site_notes.py
├── landlord_overrides.py
├── baseline_performance.py # lodged + effective pair (ADR-0004)
├── plan.py # Plan, PlanPhase, OptimisedPackage
├── scenario.py # Scenario, ScenarioPhase, ScenarioSnapshot (ADR-0005)
├── recommendation.py
├── geospatial.py
├── solar.py
├── anomaly_flags.py
└── ml/
├── __init__.py
├── transform.py # EpcMlTransform (versioned per §8.3)
└── schema.py
When datatypes/epc/domain/ folds in, the EPC schema types move under src/domain/epc/.