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 http://www.osha.gov.

July 5, 1979

MEMORANDUM FOR: VERNON A. STRAHM
                Regional Administrator

THRU:           ROGER CLARK Acting Field Coordinator

FROM:           GROVER C. WRENN Director
                Federal Compliance and State Programs

SUBJECT:        Clarification of 29 CFR 1926.855(b) and (f)

REFERENCE:      Your Memorandum Dated May 25, 1979

The term floor arch as it is being used in the section for manual removal of floors, 29 CFR 1926.855, means the masonry filling between the floor beams and girders, irrespective of the type of floor system.

The American National Standard ANSI A10.6-1969, Safety Requirements for Demolition section 3, defines the term floor arches as indicated above, and was used by the Construction Task Force as the source document for 29 CFR 1926.855(b) and (f).