Member Dimensions (Optional)
King Post Truss
King Post
Simple design with central vertical post
Queen Post
Two vertical posts for wider spans
Fink (W-Truss)
W-shaped web pattern, most common
Howe
Vertical and diagonal members
Important Notice
Results are estimates for planning purposes only. Actual truss dimensions and materials may vary based on engineering specifications, local building codes, load requirements, and material availability. Always consult a structural engineer for final designs.
A roof truss is a structural framework designed to support the roof of a building. It consists of interconnected triangular units that efficiently distribute the weight of the roof to the walls below. Trusses are engineered to handle various loads including the weight of roofing materials, snow, wind, and any equipment mounted on the roof.
The triangular shape is key to a truss's strength - triangles are inherently stable and resist deformation under load. By combining multiple triangles, trusses can span large distances without intermediate support, making them ideal for open floor plans and large buildings.
Top Chord (Rafters)
The sloped upper members that follow the roof pitch. They support the roof decking and transfer loads to the web members and bottom chord.
Bottom Chord
The horizontal lower member that spans between the walls. It acts as a tie, preventing the walls from spreading under the roof load.
Web Members
The internal diagonal and vertical members that connect the top and bottom chords, creating the triangular patterns that give the truss its strength.
King/Queen Post
The central vertical member(s) that transfer loads from the apex to the bottom chord. King post trusses have one; queen post trusses have two.
King Post Truss
Best for: Small spans up to 8m (26ft). Simple design, economical for garages, sheds, and small residential buildings. Limited by span due to lack of intermediate support.
Queen Post Truss
Best for: Medium spans 8-12m (26-40ft). Two vertical posts provide more support than king post design. Good for residential and light commercial buildings.
Fink (W-Truss)
Best for: Most residential applications. The W-shaped web pattern provides excellent strength and is the most common truss type. Economical and efficient for spans up to 15m (50ft).
Howe Truss
Best for: Heavy load applications and longer spans. Vertical members in compression and diagonals in tension make it suitable for bridges and industrial buildings.