A truss is a supporting structure of framework relying on a triangular arrangement of webs and chords to transfer weight to reaction points. This arrangement gives them high strength to weight ratios, permitting longer spans than conventional framing, and offers greater flexibility in floor plans. They can be designed in any shape or size, restricted only by manufacturing capabilities, shipping limitations, and handling considerations.

Common types of trusses are:

- King post truss
- Queen post truss
- Scissor truss
- Hammer beam truss

King post truss - is the most cost effective and solves many structural problems. It is the simplest form of truss in that it is constructed of the fewest members. The truss consists of two diagonal pieces that meet at the apex of the truss, one horizontal beam that ties them together, and the "king post" which connects the apex to the horizontal piece.
Modified king post truss
Traditional king post truss
Queen post truss - is very similar to the king post truss except that the interior of the truss has two vertical "queen posts" instead of one central "king post". A queen post truss can easily span 30 feet if spaced 12 feet apart.
Scissor truss - tad more expensive but enables some height in the middle of the room.
Scissor trusses are used to achieve cathedral ceilings.
Hammer beam roof truss - comes from old style cathedrals.
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