The roof goes up with amazing speed on our home.  The choice for a gabled roof (With two sides) pays off in quick an uncomplicated construction.  Each truss is pre-constructed at the factory for our home and is easily place on the roof with a small crane.  Each rafter is then attached to the roof with steel tabs to secure the roof down from high wind.   The roof also overhangs the edges of the house to allow airflow through the ridge vent at the top of the roof.  The roof is then sheathed with OSB for rigidity and a flat surface for the asphalt shingles.