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I. Some common 1:1 ratios are an 8 x 8 inch photo, a 1080 x 1080 pixel image, or typically any profile picture template on social media sites (think Facebook). The platform height of a rolling scaffold must not exceed four (4) times the smallest base dimension (Cal/OSHA and some Government agencies require a stricter ratio of 3 to 1) Always keep casters locked while on scaffold. − The height to base width ratio of the scaffold during movement is greater than 2 to 1, unless the scaffold is designed and constructed to meet or exceed nationally recognized stability test requirements (such as ANSI/SIA A92.5 and A92.6) (1926.452(w)(6)(ii)) Retraining When the length of the scaffold is greater than the height, bracing should be repeated starting at least with every fifth post. OSHA requirements are set by statute, standards and regulations. Your materials describe three "lock-pin" scaffold models. It is usually expressed as two numbers, such as 3:2, 4:3 or 16:9. Sincerely, [29 CFR 1926.451(c)(1)]Note: Install guys, ties, and braces at locations where horizontal members support both inner and outer legs. Guys, ties, or braces must be installed where horizontal members support inner and outer legs when the scaffold has a height/width ratio greater than: a.2 to 1 b.3 to 1 c.4 to 1 d.5 to 1. c. The space between adjacent planks and the space between the plank and the uprights must be no more than: a.1/2 inch b.1 inch c.1 1/2 inches d.2 inches. Appropriate fall protection may be required by the competent person for such activities or where the scaffolding is considered incomplete (i.e. This limits the height of platforms with standard outrigger stabilizers and single span towers to approximately 9 m (30 ft). The checklist does not address criteria for suspension scaffolds, suspension ropes, and stairtowers. Selecting the least dimension provides the following widths: 4-foot scaffold is 4 ft.; 6-foot scaffold is 6 ft.; 7-foot scaffold is 7 feet. We apologize for the misunderstanding and resulting delay in providing this response. Our interpretation letters explain these requirements and how they apply to particular circumstances, but they cannot create additional employer obligations. You can also contact us by mail at U.S. Department of Labor, OSHA, Office of Construction Standards and Guidance, Room N3468, 200 Constitution Avenue, N.W., Washington, D.C. 20210, although there will be a delay in our receiving correspondence by mail. Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. First, please note that OSHA neither approves nor endorses products. [ back to text ], 3We note that in the submitted drawings, the outrigger frame is pictured on only one side of the scaffold. • Any scaffold with a height-to-base width ratio of 4-to-1 or greater should be restrained from tipping by means of outriggers, guying, tying or bracing. Height to smallest base dimension — Supported scaffolds with a height -to smallest base width ratio of more than 4-to-1 (including outrigger supports) must be restrained from tipping by ties, guys, braces, or equivalent means. The 4-foot scaffold becomes 4 ft. by 6.167 ft.; the 6-foot scaffold becomes 6 ft. by 6.417 ft.; the 7-foot scaffold becomes 7 ft. by 7.333 ft. (c) Criteria for supported scaffolds. April 8, 2005 The addition of your outriggers adds 4 feet to the width and effectively creates a new length for each model. In the United States, the OSHA requires such bracing when a scaffold's height to width ratio 4 to 1 or greater. One of those requirements is §1926.452(w)(6)(ii), which states: The materials you submitted do not indicate that you have designed and constructed the "lock-pin" scaffolds to meet or exceed "nationally recognized stability test requirements." Guys, ties or braces shall be installed at locations where horizontal members support both inner and outer legs. However, in light of the width measurements in your materials, we have calculated the maximum permissible scaffold height for use without restraints. Note that our enforcement guidance may be affected by changes to OSHA rules. Re: Whether a mobile scaffold outrigger design meets the requirements of 29 CFR 1926.451(c)(1). Every 20 feet after for scaffolds less than 3 feet wide, 26 feet for ones wider than 3 feet. missing parts due to area obstructions). base dimensions than 5.4m. Directorate of Construction, 1 When we originally received these questions from you in April 2003, it was unclear to us if you were requesting a response to each or if they were submitted only to call our attention to these issues in the event that OSHA were to do further rulemaking on the standard. Be sure to use vertical and horizontal tie-ins to keep the scaffold from falling into, or away from, a structure. Don’t Ride a Rolling Scaffold Begin with Good Footings Base plates Guy wires and ties prevent scaffolding from tipping away from the building or structure, and braces are rigid supports that prevent the scaffolding from tipping into the building or structure. Height to base width ratio. Background Section 1926.451(c)(1) states: Criteria for supported scaffolds. (1) You must make sure supported scaffolds with a height to least base di-mension ratio of greater than four to one are prevented from tipping by one or more of the following: (a) Guying; (b) Tying; (c) Bracing; (d) Other equivalent means. Do the captions in the Non-mandatory Appendix override the requirement in §:1926.451(c)(1)(ii)? Dear Mr. Holman:  Height to smallest base dimension—Supported scaffolds with a height -to smallest base width ratio of more than 4-to-1 (including outrigger supports) must be restrained from tipping by ties, guys, braces, or equivalent means. Tip: If you open your report in Layout view, Access displays vertical dashed lines indicating the current page width dimensions.Using those dashed lines as guide, you'll have an easier time seeing which controls need to be moved or resized to prevent spilling over the page dimensions. Answer: In your question you focus on §:1926.451(c)(1), which states, in part: By its terms, §:1926.451(c)(1)(ii), at levels above the initial tie-in and below the top tie-in, establishes maximum intervals of 20 feet. Based on the information you provided, we were unable to calculate the scaffold's total height. Supported scaffolds with a height to base width ratio of more than 41 must be restrained from tipping by guying, tying, or bracing. [29 CFR 1926.451(c)(1)]Note: Install guys, ties, and braces at locations where horizontal members support both inner and outer legs. Supported Scaffolds (cont.) (1) Supported scaffolds with a height to base width (including outrigger supports, if used) ratio of more than four to one (4:1) shall be restrained from tipping by … Re: Tie-in requirements for supported scaffolds; §:1926.451(c)(1)(ii); errors in Non-Mandatory Appendix E. Please consult the OSHA standard 29 CFR 1926.451 for these types of scaffold situations. Working Out Height Capacity of Scaffolding. Guys, ties and braces shall be installed where horizontal members support both inner and outer legs. Footings must support. [ back to text ], Occupational Safety & Health Administration, In 1983, OSHA explained that, for the purposes of the scaffold height-to-base width ratio, the Agency uses the "total height" in relationship to the smaller base dimension. A qualified person must design the tie-ins. Therefore, it is not possible to comment on the adequacy of a scaffold design without reference to specific use information. Employees are required to wear hardhats on scaffolding to protect them dropped items. uprights, with a height to base width ratio of more than 4:1, must be on base plates and mud sills or other firm foundation: • Vertically—every 20 feet or less for scaffolds less than three feet wide; every 26 feet or less for scaffolds more than three feet wide. All scaffold frames and uprights should use base plates, and … [Emphasis added.] When the length is shorter than the height, bracing should be installed from the base of end posts upward to the opposite end posts and then in alternating directions until the top of the scaffold is reached. Supported scaffolds with height to base width ratio of more than four to one (4:1) shall be restrained from tipping by guying, tying, bracing, or equivalent means. Alternatively, guardrail systems, canopies, or catch platforms may be installed to retain materials. WAC 296-874-40004 Prevent supported scaffolds from tipping. A platform greater than 10 feet in length shall not extend over its support more than 18 inches, unless it is designed and installed so that the cantilevered portion of the platform is able to support employees without tipping, or has guardrails which block employee access to the cantilevered end; Page 4 3.4.1.10. After your communications with my staff on January 13, 2005, we understand now that you are requesting a response to each question. You can also contact us by mail at the above office, Room N3468, 200 Constitution Avenue, N.W., Washington, D.C. 20210, although there will be a delay in our receiving correspondence by mail. First fastening device should be attached at the closed horizontal member to the 41 height. How can one prevent supported scaffolding from tipping? The height to base width ratio of the scaffold during movement is. vertical ties repeat every 26 feet or less for scaffolds that are greater than 3 feet in width; and scaffolds with a height-to-base ratio of greater than 4:1 are restrained from tipping by guying, tying or bracing. These are great for containing items and tools on the scaffold. Except as provided in paragraphs (a)(2), (a)(3), (a)(4), (a)(5) and (g) of this section, each scaffold and scaffold component shall be capable of supporting, without failure, its own weight and at least 4 times the maximum intended load applied or transmitted to it. However, another requirement in Subpart L, §:1926.451(a)(1), states: If meeting the capacity requirement in §:1926.451(a)(1) necessitates installing tie-in/guy ties/braces at closer intervals, the employer would be required to do so. Be required by the competent person for such activities or where the scaffolding is considered incomplete (.... 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