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`u_roof` only implemented the joist column, so roofs lodged insulated at rafters (`roof_insulation_location == 1`) were mis-billed at the joist U on both the API and Summary paths — under-stating loss, over-rating SAP. RdSAP 10 §5.11.2 Table 16 (spec p.42-43) gives a distinct "insulation at rafters" column (2): the rafter cavity is shallower than a loft void, so the same depth yields a higher U (200 mm: rafters 0.29 vs joists 0.21). §5.11 Table 18 (p.45) likewise carries a rafters column (2) for unknown / as-built thickness (footnote (1): "The value from the table applies for unknown and as built") — band A-D = 2.30, E = 1.50, F = 0.68, diverging from the joist column's 100 mm-equivalent 0.40 default (footnote (4)). - add `_ROOF_RAFTERS_BY_THICKNESS` (Table 16 col 2) + `_ROOF_RAFTERS_BY_AGE` (Table 18 col 2) to rdsap_uvalues; `u_roof` selects them via a new `insulation_at_rafters` flag (ignored for flat / sloping-ceiling roofs). - `heat_transmission` derives the flag PER BUILDING PART from `roof_insulation_location` (gov-API int 1 / Summary "R Rafters"), which also fixes the multi-part dedup-roof-join problem: each part's own location now drives its U, replacing the unattributable joined `epc.roofs[]` description. Worksheet-validated to 1e-4: simulated case 41 (4-bp — Ext1 rafters 200mm → 0.29, Ext3 rafters As-Built band F → 0.68; roof total 24.8350) and case 42 (6 variants — rafters 50mm → 0.88, rafters unknown band C → 2.30, joists/none unchanged). Case 40 stays exact (roof 35.340, total 441.1606); worksheet harness 47/47. Corpus within-0.5 66.9% → 66.5% (gates 0.65/1.08 hold) — a spec-correct shift, NOT a regression: all 15 corpus rafter certs carry redacted (None) thickness yet lodge roof EER 2-4 (insulated), so the open API blanked a specified thickness and the spec's unknown-rafter 2.30 default correctly over-states them. Recovery needs a roof-EER→thickness inference on the API path (follow-up), not a change to the U-table. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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| domain | ||
| harness | ||
| infrastructure | ||
| magic_plan | ||
| orchestration | ||
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| utilities | ||
| __init__.py | ||
| conftest.py | ||
| test_lambda_packaging.py | ||