Faraday Shielding question

I've been experimenting with Faraday shielding using sheets of heavy copper foil (roofing flashing)under component shelves and copper plumbing couplers on power cable ends and the effects have been startling - yielding a more detailed, dynamic and effortless flow of music.
I want to continue my experimentations but find copper somewhat pricey. I'm wondering if aluminum window screening material will achieve the same effect as copper.
Thanks for any insight.