There can be many defects in the attic area some minor and some major. Some defects that might be found are missing insulation a low amount of insulation  which may affect energy efficiency.Missing proper fasteners at the ceiling access door, or missing fire blocking material at the attic access doors.Rafters can be cut, cracked, split, or even missing in areas. Purling supports cut out around A/C systems or other areas. Collar ties cut, cracked, split,  missing or not secured.There also may be moisture damaged discovered at rafters or other areas in attic. There may be open chases present in the attic.These are some of the defects that can be found in an attic area. It's important to always be careful when walking in an attic especially  if there is not any decking present.