Where do you get the lead sheets?
Its basically the flashing it could be anywhere.I get it from the old boots that they used to use around the sewer vent on houses. They use rubber now, so look for an old abandoned house that has fallen down (lots of them around here), and scavange some.
Some older hardware stores still have them, and can't sell them anymore (lead is a no-no according to Uncle Sugar). You may get a lifetime supply for free.
I don't plan on licking the stuff.Lex Luthor's Bed, Bath and Bane of Humanity
And if I didn't want Superman to know what I was doing in bed, I bet lead sheets would come in pretty handy.