S500 Class-of-Loss Screen by Wetted-Surface Fraction

Turns the wetted-surface field read (how much of the floor and wall is wet, how high it wicked, whether low-evaporation assemblies are wet) into a candidate IICRC S500 Class of water intrusion and the matching per-class evaporation factor. A deterministic screen that proposes a Class and states the rationale; the inspector's classification and a moisture map govern.

top-down (first match wins): Class 4 if low-evaporation materials wet; else Class 3 if wick_height_ft > 2.0 or wall_wet_fraction >= 0.40; else Class 2 if floor_wet_fraction >= 0.40; else Class 1. Output carries the matching per-class evaporation factor (gal/ft^2).

ANSI/IICRC S500 Class-of-loss definitions and the 24 in (2 ft) wick threshold, by name; thresholds are deterministic where S500 leaves a judgment band.

S500 keys the Class to affected surface area, the wick height above 24 in, and the presence of low-evaporation assemblies. The four Class definitions are public.

Estimate. AHJ and licensed professional govern.

Field names used by the API: floor_wet_fraction, wall_wet_fraction, wick_height_ft, water_class

• Class framework the four S500 Classes keyed to wetted surface, the 24 in wick threshold, and low-evaporation materials (hardwood / plaster / lightweight concrete / masonry -> Class 4)ANSI/IICRC S500
• Thresholds the 40% surface fractions are deterministic, editable screens where S500 leaves a judgment bandANSI/IICRC S500
• Scope a screen that proposes a Class and feeds the per-class evaporation factor; the inspector and a moisture map governANSI/IICRC S500