So here is the deal, I have a made from scratch roofing shingle material and after struggling with the scale and proportions I came to realize I had a curious problem. On some of the sloped faces the shingles ran the right way, but on others the rows of shingles ran perpendicular to the direction they wee supposed to be in, any ideas?

problem solved
the number of sides when making an arc was set at 2 instead of 24

I just began work at a new job and the second i begin using sketchup i notice a problem, sketchup wont make arcs, it breaks them down into a line split at the center of where the arc should be, maybe im missing something here but any suggestions?