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RdSAP 10 §2 (Ventilation, "Walls" row): "Structural infiltration: 0.25 for steel or timber frame or 0.35 for masonry construction ... System build: treated as masonry." `_is_timber_or_steel_frame` wrongly included wall_construction code 6 (system build) alongside code 5 (timber frame), handing system-build dwellings the 0.25 structural ACH instead of 0.35. On the cat-10 room-heater fixture (ref 001431, walls SY System Build → code 6) this under-stated the infiltration rate (18) by exactly 0.10 (0.45 vs worksheet 0.55), dropping the effective air change (25), the ventilation heat loss (38)m = 0.33 × (25)m × (5), and the heat-transfer coefficient (39) — so space-heating demand (98) came out 404 kWh low ((211) 11158.6 vs worksheet 11563.2). Restrict the 0.25 branch to code 5 only; code 6 (and everything else) is masonry at 0.35. Pins the rating-block (38)m ventilation heat loss mean = 83.3613 W/K at abs 1e-4 and asserts the classifier treats the system-build wall as masonry. §4 suite green (2415 passed, 1 skipped); no existing fixture relied on system-build → 0.25. Residual after this slice: SAP +0.03 / cost -£0.95 — a small fabric (33) gap (-0.15 W/K) plus lighting (232) +1.0 kWh remain as separate causes. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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