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An as-built cavity wall (wall_insulation_type=4) lodged "Cavity wall, as
built, insulated (assumed)" was routed to RdSAP 10 Table 6's "Filled
cavity" row. Per Table 6 (England, PDF p.41) the Filled-cavity row carries
the "†" footnote ("assumed as built") only at age bands I-M, where it is
numerically identical to "Cavity as built"; at bands A-H the Filled-cavity
row represents a GENUINE fill, not the as-built assumption. So an as-built
cavity must use the "Cavity as built" row at all bands (band G/H = 0.60,
not the filled 0.35).
This is the same latent A-H bug slice S0380.210 fixed for the "partial
insulation (assumed)" variant but left in place for "insulated (assumed)"
by a legacy production convention. The API SAP-accuracy cohort over-rated
"Cavity wall, as built, insulated (assumed)" certs at bands G/H by a clean
+1.38 / +1.61 SAP median (n=37 / n=18); bands I-M were unaffected (rows
coincide), confirming the spec mechanism per-band.
Retires the `_cavity_described_as_filled` description sniffer — as-built
cavities now always use the as-built row regardless of the rendered
insulation adjective; a genuine retrofit fill is still caught by the
explicit wall_insulation_type=2 branch.
API SAP eval: 48.6% -> 52.1% within 0.5; <1.0 63.8% -> 67.2%; median |err|
0.548 -> 0.475; mean|err| 1.561 -> 1.497; 909 computed, 0 raises.
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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| .. | ||
| fixtures | ||
| __init__.py | ||
| _elmhurst_fixtures.py | ||
| _elmhurst_worksheet_000474.py | ||
| _elmhurst_worksheet_000477.py | ||
| _elmhurst_worksheet_000480.py | ||
| _elmhurst_worksheet_000487.py | ||
| _elmhurst_worksheet_000490.py | ||
| _elmhurst_worksheet_000516.py | ||
| _elmhurst_worksheet_000565.py | ||
| _elmhurst_worksheet_001431.py | ||
| _elmhurst_worksheet_001431_6035.py | ||
| _elmhurst_worksheet_001431_case5.py | ||
| _elmhurst_worksheet_001431_case6.py | ||
| _elmhurst_worksheet_001431_case7.py | ||
| _elmhurst_worksheet_001431_case20.py | ||
| _elmhurst_worksheet_001431_case21.py | ||
| _elmhurst_worksheet_001431_rr.py | ||
| _elmhurst_worksheet_001431_rr8.py | ||
| _xlsx_loader.py | ||
| test_appendix_h_solar.py | ||
| test_dimensions.py | ||
| test_e2e_elmhurst_sap_score.py | ||
| test_energy_requirements.py | ||
| test_fabric_energy_efficiency.py | ||
| test_fuel_cost.py | ||
| test_heat_transmission.py | ||
| test_internal_gains.py | ||
| test_mean_internal_temperature.py | ||
| test_mev.py | ||
| test_photovoltaic.py | ||
| test_rating.py | ||
| test_section_cascade_pins.py | ||
| test_solar_gains.py | ||
| test_space_cooling.py | ||
| test_space_heating.py | ||
| test_utilisation_factor.py | ||
| test_ventilation.py | ||
| test_water_heating.py | ||