Title: Lay out for a truss installation.
Course: Carpentry II (17003-II) > Section: Installing Trusses

Layout should include

- identifying the truss detail
- identifying the nail pattern
- determining the position of centers (e.g., 12 inch, 16 inch, 19.2 inch, 24 inch) from details, accurate to within +/- 1/16 inch.

Process/Skill Questions:

- What is the most common spacing of trusses? Why?
- What factors influence the spacing of trusses?

NCCER Carpentry
General Carpentry, Module 27112 Roof Framing describes the most common roof types and introduces basic roof framing components. Includes instructions for laying out rafters for gable roofs, hip roofs, and valley intersections. Covers stick-built and truss-built roofs, and includes the basics of roof sheathing installation.