Originally Posted by
Tim Voss
Right. I was thinking maybe they didn't bend them properly, and that's why the edges are lifted.
Tim,
I'm thinking the edges never "lifted".
That the tile are simply laid flat ... and the angle they would be at when laid over two other layers, because the butt end (the low and exposed end) would be 1/2" -3/4" above the roof sheathing when the head end (the end covered and nailed down) is tight to the roof sheathing. Think of nailing a 1x2 down and then laying a shingle over it, one end will be 'waving in the wind' while the other end is nailed to the roof sheathing. It's a see-saw resting with one end down.