Title: Install roof underlayment.
Course: Building Trades II (17009-II) > Section: Carpentry: Installing Roofing

Installation should include

- tightening the underlayment with 2-inch horizontal overlaps
- fastening according to code.

IRC: Chapter 9 covers all types of roof underlayment approved for use under the building code. Table R905.1.1 (1) identifies underlayments, while Table R905 explains the use of different roof coverings (https://codes.iccsafe.org/content/IRC2018P4).

Process/Skill Questions:

- What purpose does roof felt serve?
- What are the problems associated with improperly installed felt?

NCCER Standards:

Carpentry: Level 3

- 27302-02 Roofing Applications