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Homeowners protection class and construction matrix: Split class 8B is downgraded by hydrant distance · case 03

Split-class 8B homes lose their split-class rating.

Member previewVariant 3 · 3 implementations · 10 checks per implementation

Case contract

Input base, pc ('1'..'10' or split class '8B'), construction, station_miles, hydrant_feet, matrix {'pc-construction': factor*1000}. More than 5 miles from a station -> class 10; else hydrant over 1000 ft downgrades classes other than 8B/9/10 to 9. Missing masonry factors fall back to 95% of the frame factor; any other missing cell -> 'unrated <key>'.

Why this case matters

Fire protection class lookups combine distance rules with sparse rating matrices.

One recorded failure

Sample boundary fixture

This sample comes from the broken implementation of a controlled reproducer.

Boundary fixture	Actual	Expected	Outcome
split class keeps 8B	`219615`	`209804`	Failed

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