A specialized roof truss with sloped bottom chords that creates vaulted ceiling space while providing structural support for the roof system.

A scissor truss is a specialized roof truss with sloped bottom chords that creates vaulted ceiling space while providing structural support for the roof system, featuring a distinctive configuration where the bottom chords slope upward from the bearing points toward the center, creating an open, cathedral-like interior space. This engineered structural system combines the efficiency and economy of truss construction with the architectural appeal of vaulted ceilings, eliminating the need for conventional ceiling joists while maintaining the structural integrity required for roof loads. Scissor trusses are fundamental components in residential and commercial construction where they enable dramatic interior spaces with exposed structural elements, making them popular choices for great rooms, churches, auditoriums, and other applications where high, open ceilings enhance the architectural character and spatial experience.

Scissor trusses are utilized in various architectural and structural applications including residential great rooms and living spaces where vaulted ceilings create dramatic interior volumes and enhance natural lighting, religious buildings such as churches and chapels where high ceilings contribute to the spiritual atmosphere and acoustic properties, commercial spaces including retail stores, restaurants, and offices where open ceilings create spacious, welcoming environments, recreational facilities such as gymnasiums, community centers, and sports complexes where clear spans and high ceilings are essential for activities, agricultural buildings including barns and equipment storage where high interior clearance accommodates large machinery and hay storage, and specialty applications such as aircraft hangars, exhibition halls, and manufacturing facilities where both structural efficiency and interior clearance are important considerations. Each application requires appropriate truss design based on span requirements, load conditions, and architectural objectives.

The structural design and components of scissor trusses include sloped top chords that follow the roof line and carry roof loads to the bearing points, sloped bottom chords that create the vaulted ceiling profile while serving as tension members in the truss system, web members including vertical posts and diagonal braces that connect the top and bottom chords and transfer loads throughout the truss, peak connections where top chords meet at the ridge and may include special hardware for load transfer, bearing connections at the wall supports that transfer truss loads to the building structure, and specialized connection hardware including metal plates, bolts, and custom fabricated connections that ensure proper load transfer and structural performance. Proper design requires engineering analysis to determine member sizes, connection requirements, and deflection limits.

Fun Fact: Scissor trusses get their name from the resemblance of the sloped bottom chords to the blades of an open pair of scissors, and they became popular in residential construction during the 1970s as cathedral ceilings gained architectural favor.

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