Half Scissor Truss

What Is a Half Scissor Truss?

A half scissor truss is an asymmetrical variation of a traditional scissor truss.

A standard scissor truss typically has two sloped bottom chords that rise toward the center, creating a symmetrical vaulted ceiling. A half scissor truss uses a bottom chord that slopes primarily in one direction, creating a single-sided vaulted or cathedral-style ceiling.

The result is added interior height without requiring the ceiling to peak in the middle of the space.

Because the exterior and interior slopes, span, loads, and bearing conditions can all affect the design, half scissor trusses must be customized for the individual project.

Common Uses for Half Scissor Roof Trusses

Half scissor trusses can be used anywhere a project calls for a ceiling that rises in one direction.

Common applications include:

• Custom homes with single-slope vaulted ceilings
• Great rooms and open-concept living spaces
• Home additions and expanded living areas
• Kitchens and dining rooms
• Covered patios and outdoor kitchens
• Churches and worship spaces
• Restaurants, offices, and retail properties
• Multi-family common areas

Not sure whether your plans require a half scissor truss, traditional scissor truss, mono truss, or another vaulted roof truss? Our team can review the project requirements and help determine the right configuration.

Half Scissor Truss vs. Standard Scissor Truss

Both truss styles can create a vaulted ceiling, but they produce different interior profiles.

A standard scissor truss generally rises from both exterior walls toward a higher point near the center of the room. This creates the familiar symmetrical vaulted ceiling.

A half scissor truss creates a ceiling that rises primarily from one side to the other. This asymmetrical profile is well suited to modern architecture, transitions between different ceiling heights, and spaces where a centered vault would not fit the design.

The better choice depends on the architectural plans, roofline, bearing conditions, and desired appearance of the finished room.

Benefits of Custom Half Scissor Trusses

More Interior Volume

The sloped bottom chord opens the ceiling above the room, creating additional height and a more spacious atmosphere.

Architectural Flexibility

A one-directional ceiling slope can support contemporary designs, dramatic window walls, high clerestory windows, and transitions between connected spaces.

Efficient Jobsite Installation

The required geometry is built into the manufactured truss. This reduces the need to construct a complicated vaulted roof and ceiling system one piece at a time in the field.

Integrated Structural Support

The roof-supporting structure and sloped ceiling profile are designed as one coordinated component rather than as separate framing systems.

Custom Wood Trusses Made in Texas

Allied Truss manufactures custom roof and floor trusses for residential homes, commercial properties, and multi-family developments.

Builders choose us for:

• Custom trusses manufactured for individual building plans
• Experienced in-house truss designers
• Precise, technology-driven production
• Code-conscious structural designs
• Clear project communication
• Reliable service from a Texas truss company

From a single vaulted room to a large, complex roof system, we manufacture every truss with close attention to fit, performance, and jobsite efficiency.

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Frequently Asked Questions About Half Scissor Trusses

What is the difference between a half scissor truss and a regular scissor truss?

A regular scissor truss generally has two sloped bottom chords that rise toward a central peak. A half scissor truss uses a one-directional ceiling slope.

Both can add ceiling height, but they create noticeably different interior profiles. The right option depends on the exterior roofline, room layout, bearing conditions, and architectural design.

Is a half scissor truss the same as a mono truss?

No. The two configurations may appear similar in certain plans, but they serve different structural and architectural purposes. A mono truss typically supports a single-slope exterior roof. A half scissor truss is designed to create a particular sloped ceiling profile beneath the roof.

Allied Truss can review your building plans and determine which truss configuration the project requires.

Does the interior ceiling slope match the exterior roof pitch?

Not usually. The bottom chord that forms the interior ceiling typically has a different slope from the exterior roof. The amount of interior pitch available depends on the exterior roof geometry, span, truss depth, loads, and required structural clearances.

How far can a half scissor truss span?

The available span depends on the roof and ceiling pitches, truss spacing, bearing locations, design loads, lumber specifications, and other project conditions. Because half scissor trusses are asymmetrical, they must be carefully designed for the building rather than selected according to a standard span alone.

Can half scissor trusses be used in a home addition?

Yes. Half scissor trusses can be a good choice for additions that need a vaulted ceiling, a transition between different wall heights, or a roofline that connects to an existing structure.

The existing building conditions and new loads must be carefully evaluated before the truss system is designed.

Can clerestory windows be used with a half scissor ceiling?

A ceiling that rises in one direction may create opportunities for clerestory windows or taller windows along the high wall. Window placement, headers, wall heights, and roof framing should be coordinated early so the architectural and structural components work together.