Lead stops 'Charged Particles', completely different than magnetic fields.
Steel or Iron is the best defense against magnetic fields (EM/RF) interference.
Without explaining what happens when an EMP happens again,
Grounded metal Conduit will save your home wiring and most appliances connected to it from the EMP.
What you will have to take care of is the voltage surge that will happen in the 'Grid' power lines when an EMP happens.
Anything inside of a 'Grounded' metal container will survive.
Magnetic fields don't do well with iron/steel, and grounding the container will dissipate any current produced by the EMP.
A HIGH QUALITY surge protector will save most things in the home that are sensitive, but make sure you GROUND connection is clean and ISOLATED from the 'Neutral' line in the breaker box!
There is usually a bonding screw between Neutral and Ground, and that screw MUST be removed to have a true, isolated earth ground.
Make sure your Earth Ground rod is long enough, and the connections are clean and sufficient gauge to dissipate any voltage surges that might make their way to the 'Ground' system.
"Wars begin where you will,
But they do not end where you please" - Niccolo Machiavelli.
Nothing I can do for you until you recognize it wasn't 'Islam' that attacked on 9/11/01,
It was Al-Qaeda that attacked America, hiding behind Islam...