[blackdog]

There is a company called Insul-Fab. They make a metalized sheet of plastic which is laminated. It comes in rolls like wallpaper. You overlap the edges and apply it like wallpaper to metal studs. The studs you apply a big copper fender washer at each screw to attach to the metal. You run the stuff floor and ceiling too, making sure to overlap the conductive side to each. This makes a Tempest or shielded room good to about 80db. You feed the room with an isolation transformer and ground the whole thing to a grounding rod ten feet into the ground. Don't forget a steel door with RFI gasketing and EMI / RFI attenuating vents for the air supply.

The CIA and NSA build this into their offices. They put sheet rock right over top so it looks like an office. A company called DonTek in Suburban Philadelphis makes a mesh which is stainless steel, silver plated, and carbon black coated that sandwiched between two layers of glass for the windows. It will also stop EMP, EMI, RFI problems.

I used to buid shielded rooms.

[max americana]

Thanks for the info. Does copper plating also block EMP’s? Just curious if it’s a myth or not.

[Pontiac]

You feed the room with an isolation transformer and ground the whole thing to a grounding rod ten feet into the ground.

I have read article that state that during an EMP ground currents can be created that will burn out your electronics.