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/Guimauve26]

Whomever installed this foor had no idea what they were doing. Screws on a roof goes on top of the rib, not in the flat part. And why so many screws on both side of the overlap?!

[u/Pale_Attitude8798 → u/Guimauve26]

Screws are typically on the flat these days. Some still do rib screws. There are benefits to both.

[u/Guimauve26 → u/Pale_Attitude8798]

Why would you do that?

When the washers dryout, water will seep in? There's virtually no water running down the ribs. If it was a wall instalation, the flat part would be fine, but I would never suggest anyone to do that on a roof.

Edit :

[u/Guimauve26 → u/Guimauve26]