Could some of you knowledgeable people please take a look at the photo below of my roof and let me know what you think? The house is around 6 years old and I noticed this wavy concave "feature" a couple of weeks ago. Its a dormer bungalow with no real problem on interior ceilings. Any idea what it might be and big a job it might be to fix it?
[img]http://i42.photobucket.com/albums/e325/azzeretti/roof.jpg[/img]
