I recently had my roof replaced, which included tearing out the old torch-down material and redoing my built-in (mopboard) gutters with a PVC membrane.

Upon inspection, I noticed there is loose debris—specifically loose nails and wood particles—trapped directly underneath the newly installed PVC liner.

Is it acceptable for a roofing contractor to leave debris under a fresh PVC gutter lining, or should the wood decking have been swept entirely clean before the membrane was fastened? I am concerned that walking on the roof for maintenance or the constant water weight in the gutters could cause these loose nails to puncture the PVC over time.

Has anyone dealt with a similar issue during a built-in gutter installation? Any advice on how to approach the contractor about this would be greatly appreciated!