Structural · definition
A pre-engineered triangulated frame (roof or floor) that spans long distances efficiently. Truss webs cannot be cut or altered without an engineer.
Source: SBCA — Structural Building Components Terminology
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The pillar guides set terms like this one in context — what the work involves, what drives its cost, and where it sits in the sequence of a project. Pricing a specific house takes a defined scope and an on-site assessment.