@Ragman,
Be like me, buy cheapo foil, no problemo.
I admit to having a friend tell of her aluminum foil catching on fire in the oven, now many years ago, let's say 40. That has never happened for me, but I don't put my oven up very high anyway.
Ok, ok, I've bought the heavy stuff once every five years, but I don't do a lot of Big Bird roasting.
The advent of a patterned side to foil is a new phenomenon I'm just learning about in this thread.