When may copper lightning protection materials be installed on bare aluminum roofing or siding?

Copper lightning protection materials should never be installed on bare aluminum roofing or siding due to the risk of galvanic corrosion. This type of corrosion occurs when two different metals, in this case, copper and aluminum, come into contact with each other in the presence of an electrolyte, such as moisture. The copper can cause the aluminum to corrode at an accelerated rate, compromising the structural integrity of the roofing or siding over time.

Understanding the compatibility of materials in lightning protection systems is critical. Installing copper on aluminum without any protective measures increases the risk of failure in the lightning protection system and can lead to significant repair costs and potential safety hazards. Therefore, it is essential to choose compatible materials that will not adversely affect their performance or longevity when integrated into a lightning protection system.