Lightning Protection Inspection

A Lightning Protection System inspection can be performed by either Underwriters Laboratories (UL) or Lightning Protection Institute (LPI). If performed by UL, then the certification can be either a Master Label or a Letter of Findings. If performed by LPI, then the certification can be either a Master Installation Certificate, Reconditioned Master Installation Certificate or Limited Scope Inspection.

Underwriter Laboratories Certification

Underwriter Laboratories Master Label Certification can be provided for a lightning protection system that covers an entire structure and complies with the most current UL96A standard. To obtain a Master label Certificate the lightning protection system must be designed and installed according to the latest standard. Then, an on-site visual inspection must be performed by a Certified UL Inspector who will walk the structure to ensure all components are installed according to the standard and all portions of the structure fall within a "zone of protection" provided by the installed lightning rods. The Master Label Certificate expires five (5) years after the certification is provided. Naturally, a structure’s features and conditions change over time. Each year weather events like temperatures, high winds, ice and snow may damage lightning protection systems. Building upgrades affect lightning protection as well. Construction on the roof, remodeling and changes to the electrical, mechanical or communication systems will affect lightning protection devices. The system should be inspected for damage and excessive corrosion, ensure that connections are not loose and verify that cables are continuous from the roof to the grounding electrode system. The roof should be inspected for new items as well, such as air conditioning units, satellites or any other projections. The Underwriter Laboratories Recertification Program can be provided for a lightning protection system which previously recieved a Master Label Certificate which has expired.


The Underwriter Laboratories Letter of Findings can be provided for a lightning protection system which covers only a portion of a structure and complies with the most current UL96A standard. This can be used when an a structure has an addition which has a system installed and that portion is the only part to be inspected or if there is an existing lightning protection system that is replaced due to re-roofing or some other such reason and the portion below the roof can not be verified; whether encased in concrete, covered by drywall, etc. The Letter of Findings requires and on-site visual inspection as well.

Lightning Protection Institute Certification

Lightning Protection Institute's Master Installation Certificate can be provided for a lightning protection system that covers an entire structure and complies with the most current LPI-175 standard. To obtain a Master Installation Certificate the lightning protection system must be designed and installed according to the latest standard. LPI requires installers to take pictures to verify concealed portions of the system; grounding, concealed bonding, through roof connections, etc. as well as an on-site visual inspection by a LPI Certified Inspector who will walk the structure to ensure all components are installed according to the standatd and all portions of the structure fall within a "zone of protection" provided by the installed lightning rods.


The Lightning Protection Institute's Limited Scope Inspection can be provided for a lightning protection system which covers only a portion of a structure and complies with the most current LPI-175 standard. This can be used when an a structure has an addition which has a system installed and that portion is the only part to be inspected or if there is an existing lightning protection system that is replaced due to re-roofing or some other such reason and the portion below the roof can not be verified; whether encased in concrete, covered by drywall, etc. The Letter of Findings requires and on-site visual inspection as well.