I have a 6 year old steel roof a older home that I purchased last fall.......
This spring I noticed that many of the screws are loose and not tight to the roofing.
The asphalt shingles were removed prior to the steel roof being applied.
The sheathing is not sheathing - it's 2 X 6 cedar laid diagonally on the rafters. The screws are 1 1/2" long.
I live in a northern climate, not unlike Spokane, Washington (less snow).
Does anyone know what is causing the screws to loosen or lift?