Oklahoma Administrative Code › Title 748 - Oklahoma Uniform Building Code Commission › Chapter 20 - Adopted Codes › Subchapter 12 - IFGC[®] 2018 › Section 748:20-12-8 - IFGC[®] 2018 Chapter 3 General Regulations

Current through Vol. 41, No. 20, July 1, 2024
Chapter 3 of the Oklahoma adopted IFGC® 2018 is adopted
				  with the following modifications:
(1)
				Section 306.5 Equipment and appliances on roofs or elevated structures. This
				section has been modified to correlate and add language related to parapet
				walls that exists in the International Mechanical Code® and add a second
				exception for when the section would not apply. This section has been modified
				to read: 306.5 Equipment and appliances on roofs or elevated structures. Where
				equipment requiring access or appliances are located on an elevated structure
				or the roof of a building such that personnel will have to climb higher than 16
				feet (4877 mm) above grade to access such equipment or appliances, an interior
				or exterior means of access shall be provided. Such access shall not require
				climbing over obstructions greater than 30 inches (762 mm) in height or walking
				on roofs having a slope greater than 4 units vertical in 12 units horizontal
				(33-percent slope). Such access shall not require the use of portable ladders.
				Where access involves climbing over parapet walls, the height shall be measured
				to the top of the parapet wall.
(A) Permanent
				ladders installed to provide the required access shall comply with the
				following minimum design criteria:
(i) The
				side railing shall extend above the parapet or roof edge not less than 30
				inches (762 mm).
(ii) Ladders shall
				have rung spacing not to exceed 14 inches (356 mm) on center. The upper-most
				rung shall be not more than 24 inches (610 mm) below the upper edge of the roof
				hatch, roof or parapet, as applicable.
(iii) Ladders shall have a toe spacing not
				less than 6 inches (152 mm) deep.
(iv) There shall be not less than 18 inches
				(457 mm) between rails.
(v) Rungs
				shall have a diameter not less than 0.75-inch (19 mm) and be capable of
				withstanding a 300-pound (136.1 kg) load.
(vi) Ladders over 30 feet (9144 mm) in height
				shall be provided with offset sections and landings capable of withstanding 100
				pounds per square foot (488.2 kg divided by meters squared). Landing dimensions
				shall be not less than 18 inches (457 mm) and not less than the width of the
				ladder served. A guard rail shall be provided on all open sides of the landing.
(vii) Climbing clearance. The
				distance from the centerline of rungs to the nearest permanent object on the
				climbing side of the ladder shall be not less than 30 inches (762 mm) measured
				perpendicular to the rungs. This distance shall be maintained from the point of
				ladder access to the bottom of the roof hatch. A minimum clear width of 15
				inches (381 mm) shall be provided on both sides of the ladder measured from the
				midpoint of and parallel with the rungs, except where cages or wells are
				installed.
(viii) Landing required.
				The ladder shall be provided with a clear and unobstructed bottom landing area
				having a minimum dimension of 30 inches (762 mm) by 30 inches (762 mm) centered
				in front of the ladder.
(ix)
				Ladders shall be protected against corrosion by approved means.
(x) Access to ladders shall be provided at
				all times.