I'm having a house built, and the HVAC guy is using Covalence Adhesive "Polyken" tape (black 48mm) to seat the joints of the metal ducts. His quote stated he would use 2" foil-backed tape. I'm concerned about this this Polyken tape he's using is just a type of duct tape that won't provide a good seal.
Anyone have experience with this tape? Is it OK to use, or should I force him to switch to the foil tape he quoted?