Hi guys, thanks for the response.
Yeah I know it would be really heavy poly wise for sketchup.
I've been using a method similar to what you mentioned. I modeled a single tile,then copy pasted until I had a large tiled area, using the shell tool to make all one object. Then a few rows up I made the under side flat to reduce the polys and make easier positioning. Then I cut the the roof segs using flat planes from each face of the roof pulled into a box, and use the trim tool.
works ok but real slow.
Ill try looking for the roof texture from manufacturers. maybe can use them with toms bitmap to mesh script.
Thanks