An enclosed metal structure is ideal for protection of electronic systems against an EMP attack (or a natural EMP occurrence from the sun). An ideal Faraday cage is enclosed in metal conductive material on ALL (6) sides, including the floor. Your best solution sounds like plugging up the 5% leakage that you have with some sort of metal conductive screening material. Yes, the pulse could be induced along external wiring (street pole wiring, etc.) and enter the building along the wire and zap whatever is connected to the electrical circuits inside.

The problem may be the windows – an EMP will still get in through the windows, unless you have metal screens. This could be the Achilles heel to stand-alone metal sheds that are simply setting on the ground with no conductive material underneath to complete the enclosure circuit.
Although many parts of the vehicle are enclosed to a large degree, a problem is that most cars today have a-lot of plastic instead of metal on their enclosures, and would not prevent all EMP from getting in. If the wiring is held within metal conduit (which itself is grounded), then the pulse should not escape into the air inside the building, but only fry electrical circuits on its path.

Additionally, the floor (as well as the ceiling and walls) would have to be all metal (as opposed to a wood floor sitting on metal support beams).

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