Scissor trusses are a great design! They are unique and add height to a space. A lot of people like their aesthetic appeal.
However, designing a scissor truss goes beyond the aesthetics, we also have to consider the structural engineering. This means the size of the beams based on the woods species, the span, roof pitch, and the job site location.
Many times, as the design process evolves, we provide isometric drawings for the client to review. These drawings show the overall truss design and also show proportion and spacing. Joinery can be detailed in the isometric drawing as well. The drawings often provide answers to client questions.
The scissor truss above was designed to be traditionally assembled with pegs that are cut flush. The decorative finials are an elegant touch to the design.
Sometimes, a scissor truss made of timber needs to be reinforced with steel. If that’s the case, and the client doesn’t like the look of steel, we can often hide the steel inside the timber. That way the aesthetics don’t get compromised and the building doesn’t fall down!
If you do like steel, another cool idea for scissor trusses are steel bottom chords, which are shown in the isometric drawing above. Their appearance is lighter than timber, so opting for steel chords can make a space feel more open.
Do you agree? It’s good to have options for consideration. Then you know the choice you make is suited best for you and your project.
Above, is a rustic open pavilion frame that has scissor trusses reinforced with steel joinery plates (for people who do like the look of steel).
Below, is a scissor truss engineered for a great room. The steel plate isn’t needed; it’s only added as a design detail.
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