What is the 5 category of a hurricane?

The 5th category of a hurricane would be as winds 156 mph and up (135+ kt)

Complete roof failure on many residences and industrial buildings. Some complete building failures with small utility buildings blown over or away. Flooding causes major damage to lower floors of all structures near the shoreline. Massive evacuation of residential areas may be required. Examples: Andrew(FL) 1992, Camille 1969 and Labor Day 1935.