A scissor truss is a type of roof truss that creates a symmetrical shape, allowing for a vaulted ceiling. They can be made of wood or steel and are increasingly being used in unique designs. Computer-aided models can help builders and engineers plan and conceptualize scissor truss structures.
A scissor truss is a type of trellis in which the side beams form a sort of symmetrical shape, like the two shears of a pair of scissors. In general, the term “truss” refers to a structure that holds a roof in place. Residential roof trusses are commonly made of wood with steel fittings, while some types of trusses are made of steel. Trusses provide the framework for a roof.
The original design of a roof truss was a triangle, allowing for the traditional peaked shape of a roof, with the underside of the truss helping to form a ceiling for an interior space. Today, most pylons are carefully designed using computer tools, including extensive simulations. This means that trusses are being built in an increasing variety of shapes.
Some builders advertise scissor trussing as a way to provide a different look to a building. A scissor truss can lift part of the bottom of a truss structure, as two internal beams rise to meet each other in the middle of the truss. This adds space for an interior peaked or “vaulted” ceiling. Builders discussing the need for efficient space management in a construction project may view a scissor truss structure as a partial solution. Some engineers also like the properties of the scissor truss to provide structural support for specialized projects, as the two girders forming the scissor shape can butt against each other for a higher potential load limit.
With ever-increasing options for designing residential and commercial spaces, the best way to see what a scissor truss can do for a building is with a neat printout from a computer-aided model. Engineers can submit these informal blueprints to builders to help provide conceptual design guidance while the project is still in the planning stage. Builders can also consider how adding a scissor truss to a specific part of a roof might facilitate custom spaces for a sunroof or other building features. Those looking for a little help understanding what a scissor truss design might look like can take advantage of the wide variety of information on the subject available in print and on the web.
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