I read the post linked below as it pertains to heat pumps, and I'm pretty sure the answer is the same for a furnace to condenser line set. On a new install, the black foam insulation on the vapor line has been sliced along its length every 6-12 inches or so across the diameter of the insulation. The copper line is exposed. The slicing almost looks intentional, but it could be that the line/insulation got stuck on something when they were pulling it between the condenser and the furnace. Can this be fixed with duct tape, or should I request new insulation? Thanks.