Washington Administrative Code › Title 296 - Labor and Industries, Department of › Chapter 296-880 - Unified safety standards for fall protection › NONMANDATORY APPENDICES › Section 296-880-500 - Appendix A-Determining roof widths-Nonmandatory guidelines

Current through Register Vol. 24-14, July 15, 2024
Guidelines for complying with fall restraint
				  requirements in this section.
(1) This appendix serves as a
				guideline to assist employers complying with the requirements of WAC
				296-880-40045 which allows the use of a safety monitoring system
				alone as a means of providing fall protection during the performance
				of roofing operations on low sloped roofs fifty feet (15.25 m) or
				less in width. Each example in the appendix shows a roof plan or
				plans and indicates where each roof or roof area is to be measured to
				determine its width. Section views or elevation views are shown where
				appropriate. Some examples show "correct" and "incorrect"
				subdivisions of irregularly shaped roofs divided into smaller,
				regularly shaped areas. In all examples, the dimension selected to be
				the width of an area is the lesser of the two primary dimensions of
				the area, as viewed from above. Example A shows a simple rectangular
				roof. The width is the lesser of the two primary overall dimensions,
				which is also the case with roofs sloped toward or away from the roof
				center, as shown in Example B.
(2) Many roofs are not simple
				rectangles. Such roofs may be broken down into subareas as shown in
				Example C. The process of dividing a roof area can produce many
				different configurations. Example C gives the general rule of using
				dividing lines of minimum length to minimize the size and number of
				the areas which are potentially less than fifty feet (15.25 m) wide.
				The intent is to minimize the number of roof areas where safety
				monitoring systems alone are sufficient protection.
(3) Roofs which are comprised of
				several separate, noncontiguous roof areas, as in Example D, may be
				considered as a series of individual roofs. Some roofs have
				penthouses, additional floors, courtyard openings, or similar
				architectural features, Example E shows how the rule for dividing
				roofs into subareas is applied to such configurations. Irregular,
				nonrectangular roofs must be considered on an individual basis, as
				shown in Example F.
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Such roofs are to be divided into subareas by using
				  dividing lines of minimum length to minimize the size and number of
				  the areas which are potentially less than or equal to fifty feet
				  (15.25 m) in width, in order to limit the size of roof areas where
				  the safety monitoring system alone can be used (WAC 296-880-40045(1)
				). Dotted lines are used in the examples to show the location of
				  dividing lines.
? denotes incorrect measurements of width.
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Such roofs are to be divided into subareas by using
				  dividing lines of minimum length to minimize the size and number of
				  the areas which are potentially less than or equal to fifty feet
				  (15.25 m) in width in order to limit the size of roof areas where the
				  safety monitoring system alone can be used. Dotted lines are used in
				  the examples to show the location of dividing lines.
? denotes incorrect measurements of width.
Click to
				  view image