Ditto to CB, although all my builds aren't Teles..... You'd be better served applying the copper foil shielding to other items producing RF radiation in the room than your axe; ALL single coil PUs (and some buckers for that matter...) will produce some modicum of hum, regardless of shielding, that is something you can't do anything about, here's a list of some other typical sources, and ways to try to ameliorate their effects:
1.) Fluorescent lighting - Notorious, turn any source of fluorescent lighting OFF.
2.) Computers/laptops/peripherals - Any thing with a CPU in it can put off a tremendous amount of RF, the FCC sticker on the side/bottom only guarantees that it's not enough to interfere with radio/TV reception. Turn it off, or move it to another room. Computer cases with "cool" plexiglass sides/internal lighting SUCK for RF throwoff... This is one of the items you can try that shielding on - plaster the inside of the case, but the fans and disk drives can be as bad as the CPUs. If you have a computer-based recording setup, you may want to isolate the computer to another room! Don't forget items like your TIVO/satellite or cable decoder box, they're computers, too...
3.) Cabling - Never use cheap ass unshielded cables, they're not worth the money you save and the better shielded ones will last longer anyway. Check all your cabling and make sure that no AC or DC power cords wrap around any of your cables carrying your signal path.
4.) Electric motors of any type - Ceiling/cooling fans are the most usual culprits, but anything with a motor in it can be a problem, turn it off or move as far away from the source as possible.
5.) Stomp boxes - Over the years I seen more than one of these that either produced or inducted more noise than the effect was worth. I had a phaser a LONG time ago (don't remember brand) that was noisy as hell if plugged into a power source, much less so from battery, wound up replacing it. Some boxes aren't shielded very well in the presence of RF sources and are candidates for that shielding foil... Don't be afraid to add a noise gate at the end of your effects chain.
6.) Amplifier - Sometimes your amp itself can be the hum source, be it caps or other internal components, tube bias as applicable, etc.; if this is the issue, send it tp CB and he'll fix it.
7.) Grounding - Always use 3 way plugs with grounds. NEVER use a 3 to 2 prong adapter; if you only have 2 prong outlets upgrade them and the circuit, else eventually your house might burn down anyway.
I'm sure I'm forgetting something, but I'm sure someone else will chime in...
Troubleshooting - Turn EVERYTHING off in the room. Start with just your guitar and amp. Add effects/cables one at a time. If you can't find the source there, starting lighting up other items one at a time, till you find the source.