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A flat roof lodged "Flat, no insulation" / "Flat, limited insulation" with
an undetermined insulation thickness ('ND'/'AB' → parsed None) was given the
Table 16 row-0/12mm U (2.30 / 1.50) from the description marker, regardless
of age band. Per RdSAP 10 §5.11.4 (PDF p.44) "U-values in Table 18 are used
when thickness of insulation cannot be determined" — the column (3)
flat-roof age-band default applies. The "no/limited insulation" text is
RdSAP's as-built rendering: at old bands (A-D) the column (3) default IS
2.30 (so those certs are unchanged), but a newer-band flat roof carries the
age-band insulation as built (band H = 0.35, F = 0.68, not 2.30).
Confirmed by the description-vs-rating audit: cert 0390-2753 (top-floor
flat, band H, "Flat, no insulation", thickness 'ND') lodges roof
energy_efficiency_rating = 3 (moderate U), NOT the rating-1 that 2.30
implies — and drove a -31.78 SAP error (roof 202 W/K over 88 m²). Same
masked-at-old-bands structure as the cavity-U fix: accurate at A-D where the
default coincides with 2.30, catastrophic only where it diverges.
Pitched roofs are deliberately NOT rerouted (their "no insulation" text is
load-bearing — the broad 'ND'→Table-18 reroute was empirically net-negative
for pitched lofts).
API SAP eval: 52.1% -> 53.1% within 0.5; <1.0 67.2% -> 68.0%; median |err|
0.475 -> 0.467; mean|err| 1.497 -> 1.424; flat-roof bucket within-0.5
23% -> 35% (11 improved, 2 regressed).
Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
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|---|---|---|
| .. | ||
| tests | ||
| __init__.py | ||
| demand.py | ||
| ecf.py | ||
| envelope.py | ||
| rdsap_uvalues.py | ||
| sap_efficiencies.py | ||
| schema.py | ||
| transform.py | ||
| ucl.py | ||
| ventilation.py | ||