nnLadder crews have different procedures in place for different building types. When it comes to Type I construction, firefighters must be aggressive in securing stairwells and evacuating victims from the structure. With Type II construction, firefighters may consider opening skylights or resorting to natural ventilation. Depending on the roof system, they may also rely on similar ventilation operations for Type III and Type IV construction. Type V construction requires other alternatives, including but not limited to positive-pressure attacks.n