Först Consulting Group most frequently investigates: structural framing defects (severed, over-notched, or improperly modified joists, trusses, and beams, and floor-vibration and deflection complaints); electrical violations (improper NM-B cable splicing, non-compliant use of exterior UF splice kits indoors, and concealed junction boxes lacking access); moisture and mold from envelope failures, HVAC latent-load design defects, and leaky attic ductwork; fuel-gas and plumbing code violations; non-conforming tile, stucco, and siding assemblies; deck and railing failures; failed or improperly closed permit inspections; and contract and invoice disputes including overbilling. Each finding is evaluated against the specific code section, manufacturer instruction, or performance standard it violates.