Standard Interpretations - Table of Contents
• Standard Number: 1926.501

OSHA requirements are set by statute, standards and regulations. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. This letter constitutes OSHA's interpretation of the requirements discussed. Note that our enforcement guidance may be affected by changes to OSHA rules. Also, from time to time we update our guidance in response to new information. To keep apprised of such developments, you can consult OSHA's website at

August 3, 1999

[Name & Address Withheld]

Re: STD 3.1, 1926.500; Subpart M

[This document was edited on 12/5/12 to strike information that no longer reflects current OSHA policy.]

Dear [Name Withheld]:

This is in response to your letter dated March 29, 1999, to the Occupational Safety and Health Administration (OSHA), in which you asked if there were any feasible means to control and protect employees from falling off the building during the construction and installation of the roof framing, trusses, and components.

Employers are protecting employees from fall hazards in these operations in several ways. Below are some that we are aware of:

  1. Some employers are assembling the roof as a unit on the ground and then raising it by crane.

  2. Another method involves the use of both roof anchors (permanent as well as removable anchors are available) and reusable truss braces.1 The reusable truss braces allow the trusses to be