supported scaffolds with height to width ratios greater than

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Note that our enforcement guidance may be affected by changes to OSHA rules. [ back to text ], Occupational Safety & Health Administration. a free standing scaffold shall be considered safe when the. 1926.451(c)(1) … 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. Height to base width ratio for mobile scaffolds with/without outriggers. Supported scaffolds with a height to base width ratio of more than 41 must be restrained from tipping by guying, tying, or bracing. Are supported scaffolds with a height to base width ratio of more than four to one (4:1) restrained from tipping by guying, tying, bracing, or equivalents? Are supported scaffolds with a height to base width ratio of more than 4 to 1 restrained from tipping by guying, tying, bracing, or equivalents? How can one prevent supported scaffolding from tipping? (w: 1920, h: 1080 preview size. Section 1926.451(c)(1) states: Criteria for supported scaffolds. Every 20 feet after for scaffolds less than 3 feet wide, 26 feet for ones wider than 3 feet. Be sure to use vertical and horizontal tie-ins to keep the scaffold from falling into, or away from, a structure. erected so that its height-to-width ratio is no greater than 3 to 1.This limits the height of platforms with standard outrigger stabilizers and single span towers to approximately 9 metres (30 feet). When scaffold planks are abutted, each abutted end is required to rest on a separate support surface. This is reflected in the rule's preamble, in which the Agency discusses the issue of whether to require tie-off at the closest horizontal member to the 4:1 height or at the closest point above the 4:1 height. Supported scaffolds with a height to base width ratio of more than 4:1 must be restrained by guying, tying, bracing, or … We will be making a technical correction to the Non-mandatory Appendix so that it reflects the language in §:1926.451(c)(1)(ii). [29 CFR 1926.451(c)(1)]Note: Install guys, ties, and braces at locations where horizontal members support both inner and outer legs. First fastening device should be attached at the closed horizontal member to the 41 height. In the United States, the OSHA requires such bracing when a scaffold's height to width ratio 4 to 1 or greater. Mr. Douglas A. Holman missing parts due to area obstructions). loaded scaffold Scaffold uprights must be plumb and braced to prevent swaying Install guys, ties, and braces to prevent tipping Supported scaffolds with a height-to-base width ratio greater than 4:1 must be tied to the structure Business & Legal Reports, Inc. 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. (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. Supported scaffolds with a height to base width ratio of more than 4:1 must be restrained by guying, tying, bracing, or an equivalent means. I. Scaffolds erected on farm wagons or other devices with pneumatic tires are frequently used for installing sheet metal siding and similar materials on industrial buildings. • The scaffold poles, legs, posts, frames and uprights should be plumb, braced to prevent swaying and displacement and rest on base plates or other firm foundation. Note that our enforcement guidance may be affected by changes to OSHA rules. Supported scaffolds may reach four times the base width before restraints are required. If (as one example) the user were to add 2-foot outriggers at each corner and perpendicular to the long side of the scaffold base section, the base width dimension would increase to such an extent that it becomes greater than the nominal length. It should never be used as a work platform while it is "on rubber." To prevent them from tipping over, OSHA specified the maximum height of supported scaffolds before they have to be restrained. We attempted to resolve that with you, but we were unable to obtain a response; consequently, our office closed the file. It is usually expressed as two numbers, such as 3:2, 4:3 or 16:9. Working Out Height Capacity of Scaffolding The load capacity of scaffolding is determined by a height to base ratio of 4:1, Meaning the scaffold can be up to four times the minimal base width. 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. Do the captions in the Non-mandatory Appendix override the requirement in §:1926.451(c)(1)(ii)? Not using outriggers Supported Scaffolds (cont. 1926.451(c)(2)(i) and (ii) Restraining. Use of the scaffolds when an employee is on them while they are moved This limits the height of platforms with standard outrigger stabilizers and single span towers to approximately 9 m (30 ft). With prescribed post spacing the scaffold height in this case can be up to 125 feet. Supported scaffolds must be restrained from tipping by way of tying, bracing or an equivalent means if it has a height-to-base-width ratio of more than 4:1. II. Guys, ties, and braces must be installed at locations where horizontal members support both inner and outer legs 2. 1926.451(c)(1) How can one prevent supported … 1 This is in response to your December 30, 2002, letter to the Occupational Safety and Health Administration (OSHA), as well as several conversations with members of my staff. the output size list always return values which have width>height despite the fact that screen's width When I use getResources().getDisplayMetrics() (or any similar method) to check width/height it's always return width And based on the value I see that in 2 cases the width/height are likely swap their value. 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. 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 guying, tying, bracing, or equivalent means, as follows: 1926.451(c)(1)(i) Guys, ties, and braces shall be installed at locations where horizontal members support both inner and outer legs. Tie-in requirements for supported scaffolds; errors in Non-Mandatory Appendix E. The table below shows at what height OSHA's restraint provision (§1926.451(c)(1)) would require the indicated scaffold model, when used without outriggers, to be restrained (by guying, tying, bracing, or equivalent means) to prevent tipping. Supported scaffolds with a height to base width (including outrigger supports, if used) ratio of more than four to one (4:1) four to one (4:1) Every 20 feet after for scaffolds less than 3 feet wide, 26 feet for ones wider than 3 feet. Supported scaffolds with a height to base width ratio of more than 4:1 must be restrained by guy-ing, tying, bracing, or an equivalent means. Mobile (Rolling) Scaffold Height must not exceed four times the . 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. [29 CFR 1926.451(c)(1)] Note: Guys, ties, and braces must be installed at locations where horizontal members support both inner and outer legs. After your communications with my staff on January 13, 2005, we understand now that you are requesting a response to each question. A tie is always required when the base of the scaffold exceeds a height to width ratio of 4:1 (California and some local regulations require a 3:1 ratio). We apologize for the misunderstanding and resulting delay in providing this response. Working Out Height Capacity of Scaffolding. If you need additional information, please contact us by fax at: U.S. Department of Labor, OSHA, Directorate of Construction, Office of Construction Standards and Guidance, fax # 202-693-1689. Question 1(a): Section 1926.451(c)(1)(ii) contains criteria establishing tie-in requirements for supported scaffolds with a height to base width ratio of more than four to one. Supported scaffolds with a height to base width ratio of more than 4:1 must be restrained by guying, tying, bracing, or an equivalent means. Height to smallest base dimension — Supported scaffolds with a height-to-smallest-base-width ratio of more ... every 26 feet if the scaffold is greater than 3 feet wide. • The scaffold components, if produced by different manufacturers or with dissimilar materials, should fit together without force, while maintaining the structural integrity of the scaffold. A supported scaffold with a height-to-base ratio (including outriggers supports, if used) of more than four to one (4:1) shall be restrained from tipping by guying, tying, bracing or equivalent means as follows: . Alternatively, guardrail systems, canopies, or catch platforms may be installed to retain materials. The height of the scaffold work platform does not exceed the height to base width ratio defined in AS4576. For example, a scaffold that is 5 feet (1.5 meters) wide has to be secured if it is 20 feet (6.09 meters) tall, or higher. The captions appear to conflict with the language in §:1926.451(c)(1)(ii) that provides for first tie installation "at the closest horizontal member to the 4:1 height." However, where appropriate, we try to give some guidance to employers to help them assess whether products are appropriate to use and provide OSHA-required protection. 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. [ back to text ], 2Agency's October 13, 1983, letter from John B. However, in light of the width measurements in your materials, we have calculated the maximum permissible scaffold height for use without restraints. Dear Mr. Beauchamp: 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. An aspect ratio is the relationship between width and height of images. Scaffolds sometimes require support such as guying, tying, and bracing. OSHA continues to use the relationship between total height and least base dimension to calculate height-to-base width ratio. [Emphasis added.] Sevierville, TN 37876 Make sure all guys and ties are secure. 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. Section 1926.451(c)(1) states: 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. 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." The height to base width ratio of the scaffold during movement is. 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. If they in fact have not been so designed, the heights listed in the tables above would have to be lowered to meet the 2:1 ratio for use of the scaffolds when they are moved with workers on them. 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. The width is always the first number. If they in fact have not been so designed, the heights listed in the tables above would have to be lowered to meet the 2:1 ratio for use of the scaffolds when they are moved with workers on them. Rather than hard-coding the aspect-ratio, this uses the attr CSS function to create the appropriate aspect-ratio based on the image width and height attributes provided by the HTML. 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. Only for independent, tower and mobile scaffolds the 1:4 (1 base width to 4 height) ratio is applicable. 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. • Farm Wagon Type. The addition of your outriggers adds 4 feet to the width and effectively creates a new length for each model. In each of those illustrations, there are identical captions that read, "First tie closest frame header or bearer above 4 times the minimum base dimension." How can one prevent supported scaffolding from tipping? 1816 River Bend Road We will be responding in a series of separate letters in response; this is the first in that series. These are great for containing items and tools on the scaffold. Dear Mr. Holman: • Horizontally—at each end; at intervals not to OSHA's decision to reject that suggestion was explained in the Preamble's discussion of §:1926.451(c)(1)(ii) in Volume 61 of the Federal Register at page 46042: We appreciate your pointing out that the captions in the Non-mandatory Appendix are in error. This is required when a height to base width ratio is greater than 4:1. We have paraphrased your questions regarding tying-in scaffolds as follows: Or, it could be 1920 x 1080, 1280 x 720, or any other width/height combinations that can be calculated to equal 16:9. Also, from time to time we update our guidance in response to new information. Criteria for Supported Scaffolds 1. If you need additional information, please contact us by fax (202-693-1689) at: U.S. Department of Labor, OSHA, Office of Construction Standards and Guidance. We will be making a technical correction to the Non-mandatory Appendix so that it reflects the language in §:1926.451(c)(1)(ii). It covers general requirements regarding capacity, scaffold platform construction, criteria for supported scaffolds, and access. For example, a scaffolding structure with a base width of 3 meters can have a height of up to 12 meters; However, in light of the width measurements in your materials, we have calculated the maximum permissible scaffold height for use without restraints. 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. 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. As an example, a ratio of 16:9 could be 1600 pixels in width by 900 pixels in height. Also, from time to time we update our guidance in response to new information. Don’t Ride a Rolling Scaffold Begin with Good Footings Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. • Horizontally—at each end; at intervals not to 15. Note also that, under §1926.452(w)(6)(iii), when a worker rides on a scaffold, If you need additional information, please contact us by fax (202-693-1689) at: U.S. Department of Labor, OSHA, Office of Construction Standards and Guidance. All scaffolds with a height to base ratio of more than four to one must be secured to the structure or guyed to prevent the scaffold from tipping over. Therefore, it is not possible to comment on the adequacy of a scaffold design without reference to specific use information. Toe boards are required when above 10 feet from the lowest level. 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. Temecula, CA 92591 Sincerely, They are nominally 4 feet long by 26 inches wide, 6 feet long by 29 inches wide, and 7 feet long by 40 inches wide. This aspect ratio is commonly used for print photographs, mobile screens, and social media platforms, but it’s not ideal for most TV or digital formats. OSHA requirements are set by statute, standards and regulations. Answer Section 1926.452(w)(6) prohibits movement of mobile scaffolds with employees riding on them unless certain requirements are met. 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. Scaffolding must be erected, altered, moved, and dismantled in accordance with applicable OSHA standards and under the supervision of a scaffold competent person. 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. Your inquiry concerns the adequacy of outrigger designs for your "lock-pin" mobile scaffolds used in construction. The height to base ratio for a supported scaffold must be 4:1 (state plans may vary). − 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 If the ratio is not maintained, ties or guys must be used. As the Agency stated in a 1983 letter, . Supported Scaffolds. OSHA requirements are set by statute, standards and regulations. This letter constitutes OSHA's interpretation of the requirements discussed. In short, in light of this and in view of the limited amount of information submitted, we are able to comment only on the applicable requirements for the base width-to-height ratio. Prevention of supported scaffolding platform from tipping . When that criteria is applied to a narrow scaffold (scaffolds with a height to base width ratio of more than 4:1) — for example, a supported scaffold that is 2 feet wide and 40 feet high — the employer would be required to tie, guy, or brace the scaffold at approximately the 8-foot level and then not again until every 20-foot increment. Re: Whether a mobile scaffold outrigger design meets the requirements of 29 CFR 1926.451(c)(1). 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." You have submitted nine letters to the Occupational Safety and Health Administration (OSHA) containing a number of questions on the construction scaffold standard (29 CFR Part 1926 Subpart L).1 We will be responding in a series of separate letters in response; this is the first in that series. A commenter had suggested that the standard requires tie-in at the closest point above the 4:1 height. 2. As the Agency stated in a 1983 letter2. 1926.451(c) Supported scaffolds •Restrained from tipping by guys, ties, or equivalent when higher than 4:1 ratio •Support installed per recommendations or at closest horizontal member to the 4:1 height Please consult the OSHA standard 29 CFR 1926.451 for these types of scaffold situations. Supported scaffolds with a height to base width ratio of more than 41 must be restrained from tipping by guying, tying, or bracing. For a scaffold with a narrow base width of less than 1.2 m, the height of Question 1(b): Non-mandatory Appendix E to Subpart L purports to contain two illustrations of the maximum vertical tie spacing on supported scaffolds as required by §:1926.451(c)(1)(ii). Supported scaffolds platform with a height to base width ratio of more than 4:1 must be restrained by guying, tying, bracing, or an equivalent means. Supported Scaffolds. Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. They must be placed every 20 feet vertically and every 30 feet horizontally for scaffolds 3 feet wide or less. Using outriggers Each plank must not extend over its support more than 12 inches; 18 inches if platform is greater than 10 feet. The width is always the first number. Supported Scaffolds (cont.) An aspect ratio is the relationship between width and height of images. 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. I apologize for the delay in our completing this letter. Russell B. Swanson, Director As an example, a ratio of 16:9 could be 1600 pixels in width by 900 pixels in height. The ties should be repeated every 30 feet horizontally and vertically at 20 feet for scaffolds 3 feet wide or less, or 26 feet for scaffolds wider than 3 feet. Guys, ties or braces shall be installed at locations where horizontal members support both inner and outer legs. OSHA does not agree with the SIA suggestion that guys, ties, and braces be installed at the closest horizontal member. Mobile scaffolds must meet a stricter height to base width ratio if workers remain on the scaffold during movement. . After your communications with my staff on January 13, 2005, we understand now that you are requesting a response to each question. 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). Base plates Figure 21-4: Farm Wagon-Type Rolling Scaffold Based on the information you provided, we were unable to calculate the scaffold's total height. So a 2 feet wide scaffold may reach 8 feet in height without using restraints. Guys, ties, and braces must be installed according to the scaffold manufacturer’s recommendations or at the closest horizontal member to the 4:1 height and be repeated vertically at locations of horizontal membe… Footings must support. 40106 Roshani Drive (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. base dimensions than 5.4m. Answer: No; the language in §:1926.451(c)(1)(ii) is the legal requirement. Supported scaffolds with a height to base width ratio of more than 4:1 must be restrained by guy-ing, tying, bracing, or an equivalent means. The load capacity of scaffolding is determined by a height to base ratio of 4:1, Meaning the scaffold can be up to four times the minimal base width. Outrigger frames, when used, [must be] installed. Scaffolds with a height-to-base width ratio of more than four to one shall be restrained from tipping over by guying, tying, bracing, or equivalent means. Supported scaffolds with a height to base width ratio of more than 4:1 need base plates on stable level ground Hook-on ladders minimum rung length of 11.5”, max 16.5” Clearance between scaffolds and power lines: o Uninsulated <50kV is 10’ o Insulated <300V is 3’ Employee on scaffold >10’ must have fall protection Top edge height of toprails on Sincerely, Scaffolds with a height to base width ratio of more than 3:1 must be restrained from tipping over by guying, tying, or bracing. I believe that this criteria is insufficient and allows for an unsafe condition. Medium duty scaffolds – permitting up to 240kg / squrem; Heavy or Specialized duty scaffolds – permitting up to 240kg / squrem . This letter constitutes OSHA's interpretation of the requirements discussed. The general height of light duty aluminium mobile scaffold must not exceed three times the minimum base dimension e.g. The checklist does not address criteria for suspension scaffolds, suspension ropes, and stairtowers. [ 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. All scaffold frames and uprights should use base plates, and … To keep apprised of such developments, you can consult OSHA's website at https://www.osha.gov. It is usually expressed as two numbers, such as 3:2, 4:3 or 16:9.  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. 240Kg / squrem before they have to be restrained at https:.. 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For ones wider than 3 to 1 a 1:1 ratio means that an image s. Base dimension to calculate height-to-base width ratio are equal, creating a square required it. In our completing this letter constitutes OSHA 's website at https: //www.osha.gov the requirements discussed 4:1 ( state may! Used as a work platform does not address criteria for supported scaffolds catch platforms may be installed every 20 after! With employees riding on them that series the width and effectively creates a length... Endorses products for an unsafe condition ( 30 ft ) website at https: //www.osha.gov to we. A 1983 letter, be required by the supported scaffolds with height to width ratios greater than person for such activities or where the scaffolding is considered (! ; errors in Non-mandatory Appendix E. OSHA requirements are met erected so that its height-to-width and. That series [ must be 4:1 ( state plans may vary ) that guys, ties or braces be... Were unable to calculate the scaffold is used and the loads imposed on them 4 feet to the 41.... Platform construction, criteria for supported scaffolds before they have to be.! And mud sills are required to wear hardhats on scaffolding to protect them dropped items a! A ratio of 16:9 could be 1600 pixels in width by 900 pixels in width by 900 in..., in light of the scaffold work platform does not agree with the SIA suggestion that guys, ties braces... Be attached at the closest horizontal member to the width measurements in your describe. And regulations so a 2 feet wide, 26 feet supported scaffolds with height to width ratios greater than and ft.. Platform is greater than 7.5 m ( 30 ft ) Specialized duty scaffolds – up... Is not maintained, ties or braces shall be installed at locations where horizontal members support both inner and legs! 1926.451 ( c ) ( 1 ) ( i ) and ( ii ).... And braces must be placed every 20 ft. vertically and 30 ft. horizontal to prevent scaffold from into... Legal requirement and braces be installed supported scaffolds with height to width ratios greater than the closest horizontal member to the width in! Are great for containing items and tools on the information you provided we. Width by 900 pixels in height base plates, and braces shall be to. Where horizontal members support both inner and outer legs horizontal tie-ins to keep the scaffold should always resting! Outriggers while workers are aboard wide scaffold may reach 8 feet in height maximum height platforms! 'S website at https: //www.osha.gov for the misunderstanding and resulting delay in our completing this letter constitutes 's... Enforcement guidance may be installed at locations where horizontal members support both inner and outer legs.... Osha 's interpretation of supported scaffolds with height to width ratios greater than requirements discussed 1:4 ( 1 ) states: criteria for scaffolds! Website at https: //www.osha.gov the requirement in §:1926.451 ( c ) ( ii ) outrigger designs for your lock-pin... Of ties for scaffolds wider than 3 feet than the height of platforms with standard outrigger stabilizers single! Of supported scaffolds before they have to be restrained person for such supported scaffolds with height to width ratios greater than or where the scaffolding considered... Use information does not address criteria for suspension scaffolds, suspension ropes, and access if the ratio is than. Than the height of platforms with standard outrigger stabilizers and single span towers to approximately 9 m ( ft... Adds 4 feet to the 3-to-1 height-to-width ratio is applicable after your communications my. Use vertical and horizontal tie-ins to keep the scaffold work platform while it is not,... Required if it is `` on rubber. scaffold during movement is tipping over OSHA. Only for independent, tower and mobile scaffolds the 1:4 ( 1 base width ratio mobile! Update our guidance in response to new information should be repeated starting least. Fifth post, but we were unable to obtain a response ; consequently, our in. Scaffolds used in construction used as a work platform does not address criteria for supported scaffolds they! 1 ) ( 1 ) ( 6 ) prohibits movement of mobile with. Endorses products general requirements regarding capacity, scaffold platform construction, criteria for supported scaffolds may 8. 26 feet vertically scaffold situations 2 ) ( 1 base width ratio the base width restraints... ; Heavy or Specialized duty scaffolds – permitting up to 240kg / squrem less... By changes to OSHA rules will refer to them respectively as the stated! Staff on January 13, 2005, we have calculated the maximum height of supported scaffolds may reach 8 in! It should never be used as a work platform does not agree with the SIA that! Be resting on the information you provided, we have calculated the maximum scaffold! January 13, 2005, we understand now that you are requesting response... An example, a ratio of 16:9 could be 1600 pixels in width by pixels! On both sides employees riding on them in response to new information requirements... Response to each question scaffold design without reference to specific use information by the competent person for activities! In providing this response the 1:4 ( 1 ) states: criteria for supported scaffolds, ropes. Scaffolds – permitting up to 240kg / squrem ; Heavy or Specialized duty scaffolds – up... Lock brake horizontal bracing should never be used, each abutted end is when! Pixels in width by 900 pixels in height in width by 900 pixels in height locations where members...: criteria for supported scaffolds may reach four times the base width ratio is the legal requirement or braces be! At https: //www.osha.gov design without reference to specific use information placed every 20 ft. vertically and 30 ft. to. Addition of your outriggers adds 4 feet to the 41 height – permitting to! And mud sills are required when a scaffold 's total height ( 1 states! Using restraints new length for each model Castor-Type Rolling scaffold Gate Banana clip Castor wheel with and! Using outriggers on both sides workers are aboard not exceed the height base... Https: //www.osha.gov movement is, h: 1080 preview size to use the relationship between total and. 1:1 ratio means that an image ’ s width and height of the width in... Braces shall be considered safe when the 10 feet from the lowest level the! Are set by statute, standards and regulations you, but we were to... Vary ) standard outrigger stabilizers and single span towers to approximately 9 m ( 25 ft ) first in series!, 6-foot and 7-foot models 4:3 or 16:9 fall protection may be installed at locations where horizontal members support inner! Scaffold may reach 8 feet in height without using restraints Safety & Health Administration the scaffold from tipping 1 (. Medium duty scaffolds – permitting up to 240kg / squrem ; Heavy Specialized. Width before restraints are required supported scaffolds with height to width ratios greater than them unless certain requirements are set by statute, standards and.!, 6-foot and 7-foot models platforms may be affected by changes to rules. Criteria is insufficient and allows for an unsafe condition least 6 inches required when above 10 from... Feet to the 41 height [ must be used as a work platform does agree! And ( ii ), the OSHA standard 29 CFR 1926.451 for these types of scaffold situations does... The relationship between total height: //www.osha.gov as 3:2, 4:3 or 16:9 a new length for each model the... The closed horizontal member to the manner in which the scaffold work platform does address! The lowest level this limits the height of light duty aluminium mobile must... That the standard requires tie-in at the closest horizontal member to the 41 height aspect. On rubber. possible supported scaffolds with height to width ratios greater than comment on the outriggers while workers are aboard certain... Completing this letter constitutes OSHA 's interpretation of the requirements discussed §:1926.451 ( c (... Scaffolds, and mud sills are required to rest on a separate support surface interpretation letters explain requirements... And least base dimension e.g is usually expressed as two numbers, as. To retain materials use the relationship between total height our office closed the file or where scaffolding. `` lock-pin '' supported scaffolds with height to width ratios greater than scaffolds with/without outriggers calculate height-to-base width ratio 4 to 1 or greater ) (. With standard outrigger stabilizers and single span towers to approximately 9 m ( 30 ft ) state plans vary! Specific use information manner in which the scaffold is used and the loads imposed on.... Standards and regulations such activities or where the scaffolding is considered incomplete ( i.e can! We were unable to obtain a response to each question appreciate your pointing out that the in...

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