SparkyGuy wrote:

Flashing material can be obtained at almost every major hardware store.
But not the Al stuff, as that won't solder...


Can use Al if I don't need to solder? Or is it solder that makes it effective
against the magnetic field?


Al won't be very good but to be of some help against EM fields it would
at least need to be riveted. After a while it'll oxydize though.

Think of it this way: In order to muffle a magnetic field coming from
the inside you need to short out any induced currents. A work of caution
if you ever do that around toroid transformers: If there is a metallic
stud that holds them in place never, never let a shield touch that. It
might result in molten metal sparkling all around you.

--
Regards, Joerg

http://www.analogconsultants.com