Dang roots can climb!

We replaced a section of sewer and the lavatory sink drain because we could not snake the lav sink without kinking the heck out of our small drain cable and we kept bringing back roots. When we cut the lav sink drain 5 feet above the floor, we found the roots had climbed right up the pipe to the first floor! Check out these pictures. I would never have expected the roots to climb vertically up the pipes like that.