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A rooflight deducts from the gross area of the roof element it pierces (RdSAP 10 §3.7, PDF p.19). A "Roof of Room" rooflight (window_wall_type=4 / site-notes "Roof of Room") sits on the room-in-roof sloped ceiling, so its area must deduct from the §3.10.1 RR residual roof — not the flat / loft external roof. The cascade deducted every rooflight from the regular roof (heat_ transmission line 814). Simulated case 6's worksheet is the first worksheet evidence for "Roof of Room" rooflight billing: "Roof room Main remaining area" net 55.54 = gross 61.73 − 6.19 rooflights (U_RR=0.30), while "External roof Main" 14.52 carries no opening. New `_bp_rr_roof_absorbs_rooflight` routes the rooflight area to the RR roof (simplified A_RR_final or detailed §3.10.1 residual) ONLY when the BP's RR contributes such a shell AND lodges no explicit roof surface (slope / flat_ceiling / stud_wall). Case 6 roof (30) 20.2284 → 19.0523 EXACT; demand gap +153 → +61 kWh/yr. Preserved: certs 000565 (Ext2 stud walls) and 000516 (slopes) lodge explicit roof surfaces → rooflight keeps deducting from the regular roof (their 1e-4 worksheet pins hold). Simplified Type 1 RR is excluded too. Re-pin (uniform spec application per [[feedback-software-no-special- handling]] + worksheet-is-truth): API certs 6035 and 0240 are detailed-RR gables-only like case 6 (no worksheet of their own for rooflights), so their "Roof of Room" rooflights now deduct from the RR residual too. This SUPERSEDES the unvalidated S0380.198 "deduct from loft" assumption. - 6035: roof 78.0648 → 73.9176; the previously-"unexplained" +1.37 PE residual COLLAPSES to -0.14 (CO2 -0.0004 → -0.0362; SAP exact 70) — strong corroboration the rooflight-on-RR treatment is correct. - 0240: PE +2.5812 → +2.1519, CO2 +0.1269 → +0.1051 (SAP 72 unchanged). Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> |
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