Building a roof can be one of the more difficult aspects of construction, especially if the roof has dormer windows and complex angles. The gable roof is advantageous because it is relatively easy to construct and has lower maintenance requirements than other styles. Using pre-engineered trusses is the simplest way to install a new gable roof and can usually be done with no mechanical lifting equipment. Trusses are triangular roof frames with zigzag supports. The size and thickness of the trusses will be determined by the size of the building and the proximity of the trusses to each other.