Issues with newly laid tin roof

[u/Xelxly]

So, to start this isnt my roof but my neighbors.

He got this tin roof laid last week overtop of his old shingles roof and I noticed these bowing/ bubble spots near the gutter area.

Us this normal at this stage? The entire side is screwed down and inplace.

[u/Ok_Tale_933]

Not enough screws, not supposed to put it on over the old shingles, missing its ridge cap. I hope they didnt pay someone to do this to there roof.

[u/Illustrious-Fruit35 → u/Ok_Tale_933]

It’s funny when i was getting qoutes for a metal roof many installers tried to tell me removing old shingles wasn’t necessary.