Lightning Protection for Multi Family Residences

Lightning protection systems require a whole-building approach in accordance with nationally-recognized standards, including LPI 175, NFPA 780, and UL 96A.

The standards require multiple conductive paths to safely carry intense lightning surges between the sky and ground. This includes strategically located air terminals (lightning rods) at high points and on the roof, ground electrodes, and a network of heavy-duty lightning conductors to safely conduct current between them.

To equalize electrical potential, the lightning protection system must also be connected (bonded) to metallic building systems such as plumbing and HVAC as well as to existing grounds for the building’s electrical and other systems.

To complete the system, surge protection devices must be added to telephone, power, and other services entering the building, to provide protection from current traveling on those lines and entering the structure.

During building construction, conductor cables will be concealed inside attics and within walls. If lightning protection is being retrofitted to an existing building, it may be most economical for some conductors to be exposed on the roof or exterior walls. These cables can be aligned with the natural edges and architectural lines of the building and will not detract from its appearance. Rooftop air terminals are slender and inconspicuous when seen from the ground; alternatively, decorative elements like spires or ornamental metal fabrications can be used as strike termination devices to add stylistic accents.

Design and installation should be performed by individuals certified by the Lightning Protection Institute. For added assurance, installations should be certified by the LPI-Inspection Program to assure systems comply with nationally recognized standards and function as required. To make sure your lightning protection system remains in working order, have it inspected by a qualified lightning protection specialist every two to five years.