This is a sample of different types of truss rafters. Each has its own advantages and disadvantages. Below are some points about each style.   king post truss   Simplest of all trusses. Used mainly on smaller building, such as garages, where there is not a large span.   fink truss   Also known as the W truss. One of the most common and widely used trusses. Gives good support to the top and bottom chords.   howe truss   Used for larger spans where the bottom chord needs more support.   attic truss   The attic truss is used in places where you want storage in the attic space. Note that there is still room for insulation outside of the storage space.   scissor truss   Used when you would like a vaulted, or open ceiling. Can also be used in a garage, when you would like more headroom. The bottom slope (inside the house) is half of the outer slope.   mono truss   Mostly used for single slope additions, such as a veranda, attached garage, or carport.   warren truss   This is often used for sloped ceilings or for flat roofs. It can also be used for floor framing.   frame hip roof   To calculate the rise run and span a of a common rafter, click here.