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A lightning protection system is designed to provide a controlled path for lightning energy, helping protect a structure and its occupants from the damaging effects of a strike. But installing the system is not the end of the process.
Buildings change. Roofs are repaired. HVAC equipment is added. Components experience weather exposure, corrosion, vibration, and normal wear. Any of these changes can affect the condition or continuity of a lightning protection system.
That is why lightning protection system re-inspection should be part of an ongoing property maintenance plan. Industry guidance recommends periodic inspections as well as additional inspections following certain building changes or events.
Lightning protection systems spend years exposed to environmental and mechanical conditions. Even when a system was professionally designed and properly installed, its condition can change over time.
The Lightning Protection Institute (LPI) notes that age, disconnections, severe weather, structural changes, corrosion, vibration, and work performed by other contractors can potentially affect a system. Regular inspection helps identify these concerns before they compromise the intended protection.
Re-inspection provides an opportunity to confirm that important components—including air terminals, conductors, connections, bonding, grounding components, and surge protection—remain appropriately installed and maintained.
There is no single inspection schedule appropriate for every property. The structure, environment, occupancy, system materials, and exposure conditions all influence inspection frequency.
LPI guidance recommends an annual visual inspection and a more thorough professional inspection at regular intervals. Its current standard recommends a qualified engineer or lightning protection installer conduct a more thorough inspection at three-year intervals, including continuity testing and a ground-resistance check.
Critical facilities or properties exposed to particularly demanding conditions may warrant more frequent professional evaluation.
Beyond the regular schedule, there are several situations when you should consider having the system inspected again.
A new roof is one of the most important reasons to schedule a lightning protection system re-inspection.
Roofing contractors may need to temporarily remove, relocate, or work around:
Even relatively minor roof work can alter the original lightning protection configuration.
LPI specifically identifies re-roofing as a situation where lightning protection maintenance and follow-up inspection are important.
If your building has recently undergone roof replacement or significant roof repairs, the lightning protection system should not simply be assumed to remain unchanged.
Adding or changing parts of a building can affect its lightning protection requirements.
Examples include:
A structure that was properly protected before a renovation may need modifications to its lightning protection system afterward.
LPI recommends inspection when alterations, repairs, or modifications are made to a protected structure.
If you know or suspect that lightning has struck your building or its lightning protection system, arranging an inspection is a prudent next step.
A strike does not automatically mean the entire system has failed. However, components, connections, surge protective devices, and grounding elements should be evaluated for potential damage or changes.
Inspection after a known lightning event can help determine whether repairs or additional testing are necessary before the next storm.
Lightning is not the only weather-related concern.
High winds, hail, heavy snow, ice, falling debris, hurricanes, and other severe weather can potentially damage exposed components or loosen attachments.
Following a significant weather event, an inspection can check for:
This can be especially important for commercial and industrial facilities with extensive rooftop equipment.
Rooftops change frequently, particularly on commercial buildings.
A facility may add new HVAC equipment, antennas, satellite dishes, communications systems, vents, solar equipment, cameras, or other rooftop components long after the original lightning protection system was installed.
These additions can change the geometry and protection requirements of the roof. LPI notes that additions and alterations can require extensions or modifications to an existing lightning protection system.
Having the system evaluated after rooftop modifications helps determine whether the existing configuration remains appropriate.
Some lightning protection problems can be visible even without specialized testing.
Property owners and facility managers should pay attention to obvious concerns such as:
These issues should not simply be left until the next scheduled inspection.
Professional inspection can determine whether visible damage affects system continuity or requires repair.
If you purchased a property with an existing lightning protection system, you may not know:
In that situation, establishing a new inspection baseline can be valuable.
LPI specifically recommends scheduling an inspection and maintenance check when owners cannot determine whether an older system remains intact or compliant with applicable standards.
The scope depends on the property and type of inspection, but a professional evaluation may include examining air terminals, conductors, connections, bonding, grounding components, surge protection devices, attachment points, and changes made to the building.
Maintenance procedures can also include tightening clamps and splices, checking system resistance and grounding electrodes, inspecting surge protective equipment, and determining whether additions or structural changes have affected system effectiveness.
A more comprehensive inspection may also include continuity and grounding-related testing.
Routine inspection is particularly important for properties where a lightning-related failure could have significant operational consequences.
Examples include:
These properties may undergo frequent renovations, equipment installations, electrical upgrades, and roof maintenance—all of which can affect an existing lightning protection system.
An inspection and maintenance program helps facility managers identify deficiencies and maintain the system as the building evolves.
A lightning protection system may remain in place for decades, but the structure around it rarely stays exactly the same.
Roof replacements, renovations, new equipment, severe weather, corrosion, maintenance work, and lightning events can all create reasons to have the system evaluated again.
Regular lightning protection system re-inspections help verify that components remain connected, properly maintained, and appropriate for the structure they are intended to protect.
Not sure when your lightning protection system was last inspected? Recently replaced your roof, modified your building, or added rooftop equipment?
Contact Site Safe Lightning Protection to schedule a professional lightning protection inspection. A proactive inspection can help identify damaged, disconnected, deteriorated, or altered components before they affect the system's intended performance.
Protect your property before the next storm—schedule your lightning protection system re-inspection with Site Safe Lightning Protection today.