The National Fire Protection Association 780 annex B.5 states: It has been shown that, in cases where damage has occurred to a protected structure, the damage was due to additions or repairs to the building or to deterioration or mechanical damage that was allowed to go undetected and unrepaired, or both.
Above: Improper material type. This causes corrosion.
Source: NFPA780, section 4.3.4.1. Connectors and fittings shall be compatible for use with the conductor and surfaces on which they are installed.
Above: The conductors have become disconnected. The conductor must be secured at a maximum of 3 ft (1 m).
Source: NFPA780, section 4.9. Conductor Fasteners. Conductors shall be fastened to the structure upon which they are placed at intervals not exceeding 3 ft (1 m).
Above: These air terminals (lightning rods) are detached, broken, or missing. The zone of protection is compromised.
Source: NFPA780, 3.3.52 Zone of Protection. The space adjacent to a lightning protection system that is substantially immune to direct lightning flashes.
Above: Although, not necesarilly wrong, the installation should be clean, neat, and professional.
Source: NFPA780, 1.5.1. Lightning protection systems shall be installed in a neat and workmanlike manner.