A truss is an engineered structural frame made of interconnected triangular units, commonly used for roof construction. Roof trusses span between exterior walls, eliminating the need for interior load-bearing walls and creating open interior spaces. Trusses are manufactured to precise specifications in factories, then delivered to construction sites for installation. Compared to traditional stick-framed roofs, trusses are typically stronger, more consistent, and faster to install. Various truss designs accommodate different roof shapes and spans. Building codes specify truss requirements and installation methods. Truss design is an engineering specialty—altering trusses after installation can compromise structural integrity, making modifications in truss attic spaces inadvisable without engineering consultation.