[davisfh]

"...my metal shop building with metal doors..."

If you'd like for your metal building to serve as a Faraday Cage/screen room, make sure that the metal roof and doors are electrically bonded together and then run ground straps from the building's lower sides to grounding stakes driven into the ground. That would likely save all electrical equipment in the building and, if you have an electrical generator, would probably spare that as well. You'll probably be depending on the generator for quite some time until the electrical grid is restored - a year or two maybe??

[JRandomFreeper]

As a long-time ham operator, I did all of that when I was a kid, back in the early '70s. It makes testing and calibrating some RF equipment much easier when you don't have to deal with noise. EMP protection is just a by-product. ;)

/johnny

[SonsOfCollins_Wallace]

Like I indicated in my previous post, if the area is large enough - multi-country/continental - then the power grid will not be up for several years (more than 2) due to no equipment available to rebuild it with and no means to get equipment to the places that need repairs.

The disruptions to any society will be enormous and causing millions of deaths for various reasons.
Haiti and N.Orleans are good examples of “minimum disruption” compared to what a sizable EMP event will cause.