I got my foil backed duct tape at Home Depot. It was a 60 yard role for $15. It seems kind of pricey, but it had both HIGHER and LOWER temperature ratings and was LONGER than the stuff at Lowe's, not to mention a dollar less. I used it to do some duct work and when building an insulated attic/stair cover. I still have lots left over for future work.
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