Built the cert in accredited Elmhurst RdSAP10-Online on the lodged register
inputs; downloaded Input Summary + SAP Worksheets (committed alongside).
Confirmed:
- Slice 5 DIRECTION validated: the externally-insulated solid-brick wall is
billed insulated by both tools (Elmhurst U 0.48, engine U 0.29), far below
the uninsulated 1.40 the pre-fix §5.8 gate produced.
- ROOF matches EXACTLY (U 0.30, 9.35 W/K).
- Engine 71.74 = lodged 71; Elmhurst current SAP 66 (its "unknown external
insulation" default is more conservative + this build used a generic combi
and no keyed wall thickness, so 66 is not a clean engine-comparison).
Follow-up lead (documented in ELMHURST_FINDINGS.md): the engine feeds the
UNMEASURED lodged wall_thickness (360 mm, measured=N) into the §5.6 formula,
whereas RdSAP §5.3 uses measured thickness / Table-3 default otherwise. The
party-wall "difference" is NOT a bug (engine 0.25 is spec-correct, Table 15
row 4). Also adds the build script scripts/hyde/build_200004296092.py.
No engine change in this commit.
Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>
