Title: Install purlins.
Course: Carpentry III (17003-III) > Section: Framing a Roof

Installation should include

- positioning the purlin as specified in the plans to within +/- 1/8 inch
- positioning the purlin plate over a load-bearing partition
- cutting to the correct length to within +/- 1/16 inch
- cutting to the correct angle to within +/- 1 degree.

Process/Skill Questions:

- What are the building codes associated with purlins?
- Why are purlins necessary?

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.