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OSHA
Regulations (Standards - 29 CFR) - Table of Contents"OSHA
Regulations (Standards - 29 CFR) - Table of Contents
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Standard Number: 1926 Subpart M App A
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Standard Title: Determining Roof Widths - Non-mandatory
Guidelines for Complying with 1926.501(b)(10)
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SubPart Number: M
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SubPart Title: Fall Protection
(1)
This Appendix serves as a guideline to assist employers complying
with the requirements of 1926.501(b)(10). Section 1910.501(b)(10)
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 50 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 that on a simple rectangular roof, width is
the lesser of the two primary overall dimensions. This is also
the case with roofs which are 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 50 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, non-contiguous
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, non-rectangular roofs must
be considered on an individual basis, as shown in Example F.
Example
A
Rectangular Shaped Roofs
Example
B
Sloped Rectangular Shaped Roofs
Example
C
Irregularly Shaped Roofs With Rectangular Shaped Sections
Such
roofs are to be divided into sub-areas by using dividing lines
of minimum length to minimize the size and number of the areas
which are potentially less than or equal to 50 feet (15.25 meters)
in width, in order to limit the size of roof areas where the
safety monitoring system alone can be used [1926.502(b)(10)].
Dotted lines are used in the examples to show the location of
dividing lines. W denotes incorrect measurements of width.
Example
D
Separate, Non-Contiguous Roof Areas
Example
E
Roofs With Penthouses, Open Courtyards, Additional Floors, etc.
Such
roofs are to be divided into sub-areas by using dividing lines
of minimum length to minimize the size and number of the areas
which are potentially less than or equal to 50 feet (15.25 meters)
in width, in order to limit the size of roof areas where the
safety monitoring system alone can be used [1926.502(b)(10)].
Dotted lines are used in the examples to show the location of
dividing lines. W denotes incorrect measurements of width.
Example
F
Irregular, Non-Rectangular Shaped Roofs
[59
FR 40738, Aug. 9, 1994; 60 FR 5131, Jan. 26, 1995]
OSHA
Regulations (Standards - 29 CFR) - Table of Contents OSHA Regulations
(Standards - 29 CFR) - Table of Contents
[62
FR 40141, July 25, 1997]
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