- Standard Number:
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 https://www.osha.gov.
September 22, 1977
| MEMORANDUM FOR: | ROBERT A. WENDELL Acting Regional Administrator, Atlanta |
| ATTENTION: | CARLYLE F. BUNN Acting ARA for the [Directorate of Science, Technology, and Medicine] |
| THROUGH: | DONALD E. MACKENZIE Acting Field Coordinator |
| FROM: | RICHARD P. WILSON Deputy Director, [Directorate of Cooperative and State Programs] |
| SUBJECT: | 1926.750 Flooring Requirements in Skeleton Steel Construction in Tiered Buildings |
This is in response to a memorandum, from your office, August 5, 1977, subject as above.
Depending on the functional requirements of the building itself and the materials used in constructing its roof, floors and walls, one or more methods of framing may be used in a single structure.
In most types of buildings, floor and roof systems are so intimately related that the two are considered together in the development of a design. Both are important, but floors are the determining factor in defining "tiered". Structural designs for mezzanines, service levels and other partial floor levels are also "tiered" when one forms a level above the other. Thus, the word "tier", as used in 29 CFR Part 1926, Subpart R, relates to floor design.
For other than "tiered" design, Parte designs not adaptable to temporary floors, to install and maintain safety nets whenever the potential fall distance exceeds two stories or 25 feet.
Since one or more methods of framing may be used in a single structure, the safety net and/or flooring requirements may apply in the one structure for the respective need.
[Correction 6/20/2005. See OSHA Directive CPL 02-01-034 "Inspection policy and procedures for OSHA's steel erection standards for construction" published on 3/22/2002 for the current policy on OSHA's steel erection standards (1926 Subpart R) for construction.]