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RdSAP 10 §3.3: "As Main Wall: Yes" makes an extension inherit the main dwelling's external wall CONSTRUCTION only — the party wall type is lodged separately per building part in the Summary §7 block and may differ. `_extract_extensions` was copying `main_walls.party_wall_type` into the inherited WallDetails, so every extension reused the main's party wall U. On the double_glazing fixture (Summary_001431) the Main lodges party "CU Cavity masonry unfilled" (SAP10 wall_construction 4 → u_party_wall 0.5) but the 1st Extension lodges "U Unable to determine" (→ 0 → RdSAP default 0.25). Pre-fix both building parts used 0.5, inflating worksheet (32) party-wall heat loss by 6.56 W/K (Ext1 26.25 m² × 0.25). After the fix worksheet (32) is exact: ours 32.573 vs worksheet 32.5725. Now reads the extension's own "Party Wall Type" from its §7 chunk, falling back to the main's only when the extension lodges none. Adds a fixture + test asserting Main=4 / Ext=0 with distinct u_party_wall. Suite 2413 pass; no cohort regression. Co-Authored-By: Claude Opus 4.8 <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 | ||