I have a 3 story, 60k sq ft, steel framed, metal roof, new construction building. Based on this type of construction, do I have to provide lightening protection for this building?
The lightning protection system would be based on the design of the roof structure. This would indicate how many air terminals would be needed and the location and spacing of those terminals.
You would next determine how many and where down conductors are to be installed and run to ground terminals.