Commit 034d4b7c corrected two stone cases but via the wrong mechanism: it
removed the 1.7 cap for ALL age bands and gated the §5.6 formula on
`wall_insulation_type is not None`. Both diverge from RdSAP 10 Tables 6-10:
- The stone rows read "According to 5.6" for bands A-D (uncapped formula)
and "1.7 a" at band E, where footnote (a) = "Or from equations in 5.6 if
the calculated U-value is less than 1.7" → U_E = min(formula, 1.7). The
cap belongs ONLY at age E. Removing it for E let an as-built 50 mm granite
age-E wall return the formula's 6.09 instead of 1.70.
- Scotland sandstone/limestone age E defaults to 1.5 (Table 7, PDF p.35);
granite/whinstone stays 1.7.
- The insulation-state gate is not a spec rule. It sent age-A-D stone with
"insulation Unknown" (wall_insulation_type None) to the flat-1.7 table
instead of the §5.6 formula; it only "worked" for fixture 000565 Ext1
because that wall is age E, where 1.7 is correct anyway. Removed: the
age-E cap, not the gate, is what produces 000565 Ext1's worksheet 1.70.
Bands A-D stay uncapped (sandstone 400 mm → 1.90, granite 120 mm → 3.89).
Unknown-thickness handling unchanged in this commit (still flat-table; the
§3.5 Table-3 default follows separately).
pyright not installed in this container — strict type gate not run locally.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
7e187078b9