Valparaiso Theatrical Company | supported scaffolds with height to width ratios greater than
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supported scaffolds with height to width ratios greater than

supported scaffolds with height to width ratios greater than

Prevention of supported scaffolding platform from tipping . 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. We will be responding in a series of separate letters in response; this is the first in that series. 3. 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. 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. 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. OSHA continues to use the relationship between total height and least base dimension to calculate height-to-base width ratio. Miles, Director -- Directorate of Field Operations, to Mr. Budd. Figure 21-4: Farm Wagon-Type Rolling Scaffold 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. This is required when a height to base width ratio is greater than 4:1. Background [ back to text ], 2Agency's October 13, 1983, letter from John B. 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? 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. Don’t Ride a Rolling Scaffold Begin with Good Footings 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. should be erected so that its height-to-width ratio is no greater than 3 to 1. Scaffold components cannot be mixed if they are from different manufac… It is usually expressed as two numbers, such as 3:2, 4:3 or 16:9. b. The checklist does not address criteria for suspension scaffolds, suspension ropes, and stairtowers. I. Is this, in fact, permitted? [ back to text ], Occupational Safety & Health Administration. 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. Many of these requirements relate to the manner in which the scaffold is used and the loads imposed on them. This letter constitutes OSHA's interpretation of the requirements discussed. Answer An aspect ratio is the relationship between width and height of images. Guys, ties, and braces shall be installed every 20 ft. vertically and 30 ft. horizontal to prevent scaffold from tipping. 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. Answer: No; the language in §:1926.451(c)(1)(ii) is the legal requirement. 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. 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. [Emphasis added.] 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). The height to base width ratio of the scaffold during movement is. Using outriggers All scaffold frames and uprights should use base plates, and … In the United States, the OSHA requires such bracing when a scaffold's height to width ratio 4 to 1 or greater. March 10, 2004 OSHA requirements are set by statute, standards and regulations. Every 20 feet after for scaffolds less than 3 feet wide, 26 feet for ones wider than 3 feet. The width is always the first number. Industrial Design Associates 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… Therefore, it is not possible to comment on the adequacy of a scaffold design without reference to specific use information. Only for independent, tower and mobile scaffolds the 1:4 (1 base width to 4 height) ratio is applicable. Note that our enforcement guidance may be affected by changes to OSHA rules. How can one prevent supported scaffolding from tipping? 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? For example, a scaffolding structure with a base width of 3 meters can have a height of up to 12 meters; A commenter had suggested that the standard requires tie-in at the closest point above the 4:1 height. Employees are required to wear hardhats on scaffolding to protect them dropped items. 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. [29 CFR 1926.451(c)(1)]Note: Install guys, ties, and braces at locations where horizontal members support both inner and outer legs. Re: Whether a mobile scaffold outrigger design meets the requirements of 29 CFR 1926.451(c)(1). The placement of ties for scaffolds wider than 3 feet may not exceed 26 feet vertically. 40106 Roshani Drive (w: 1920, h: 1080 preview size. 1926.451(c)(2)(i) and (ii) Restraining. missing parts due to area obstructions). Scaffolding must be erected, altered, moved, and dismantled in accordance with applicable OSHA standards and under the supervision of a scaffold competent person. 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. 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."  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. Scaffolds with a height to base width ratio of more than 3:1 must be restrained from tipping over by guying, tying, or bracing. It covers general requirements regarding capacity, scaffold platform construction, criteria for supported scaffolds, and access. All scaffold frames and uprights should use base plates, and mud sills are required if it is set on dirt. Guys, ties and braces shall be installed where horizontal members support both inner and outer legs. Height to base width ratio. Every 20 feet after for scaffolds less than 3 feet wide, 26 feet for ones wider than 3 feet. WAC 296-874-40004 Prevent supported scaffolds from tipping. Supported scaffolds' poles, legs, posts, frames, and uprights must bear on base plates and mud sills, or other adequate firm foundation. Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. We apologize for the misunderstanding and resulting delay in providing this response. After your communications with my staff on January 13, 2005, we understand now that you are requesting a response to each question. Not using outriggers Occupational Safety and Health Administration, Severe Storm and Flood Recovery Assistance. The height of the scaffold work platform does not exceed the height to base width ratio defined in AS4576. 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. Question: QUESTION 14 Scaffolds And Components Must Be Inspected By A Before Each Workday And After Any Incident That Could Weaken Them. Each plank must extend over its support at least 6 inches. If the ratio is not maintained, ties or guys must be used. Please consult the OSHA standard 29 CFR 1926.451 for these types of scaffold situations. However, in light of the width measurements in your materials, we have calculated the maximum permissible scaffold height for use without restraints. With prescribed post spacing the scaffold height in this case can be up to 125 feet. 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. 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) Note that our enforcement guidance may be affected by changes to OSHA rules. Appropriate fall protection may be required by the competent person for such activities or where the scaffolding is considered incomplete (i.e. 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. It is subject to the 3-to-1 height-to-width ratio and is impractical for heights greater than 7.5 m (25 ft). 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. . Our analysis shows the base geometry changes on all three models. We have paraphrased your questions regarding tying-in scaffolds as follows: Do the captions in the Non-mandatory Appendix override the requirement in §:1926.451(c)(1)(ii)? Question: Do the designs that I have submitted regarding "lock-pin" mobile scaffolds meet applicable OSHA construction requirements for height-to-base width ratios for supported scaffolds? OSHA continues to use the relationship between total height and least base dimension to calculate height-to-base width ratio. 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. We attempted to resolve that with you, but we were unable to obtain a response; consequently, our office closed the file. Height to base width ratio for mobile scaffolds with/without outriggers. 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. 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. 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. (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. 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. Mr. Douglas A. Holman 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). Supported Scaffolds (cont. Make sure all guys and ties are secure. 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. However, our calculations in the tables were based on using outriggers on both sides. I believe that this criteria is insufficient and allows for an unsafe condition. First fastening device should be attached at the closed horizontal member to the 41 height. II. Or, it could be 1920 x 1080, 1280 x 720, or any other width/height combinations that can be calculated to equal 16:9. [ 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. Or, it could be 1920 x 1080, 1280 x 720, or any other width/height combinations that can be calculated to equal 16:9. As an example, a ratio of 16:9 could be 1600 pixels in width by 900 pixels in height. 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. You can increase the height of scaffolds by … 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? Your inquiry concerns the adequacy of outrigger designs for your "lock-pin" mobile scaffolds used in construction. 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. 1 We will be making a technical correction to the Non-mandatory Appendix so that it reflects the language in §:1926.451(c)(1)(ii). 2. Mobile scaffolds must meet a stricter height to base width ratio if workers remain on the scaffold during movement. The supports that give supported scaffolds their name need to feature base plates, mud sills … • Farm Wagon Type. − 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 Guys, ties or braces shall be installed at locations where horizontal members support both inner and outer legs. When a supported scaffold reaches a height that is more than four times its minimum base dimension (4:1), it will be restrained by guys, ties, or braces to prevent it from tipping. Temecula, CA 92591 Supported scaffolds with a height to base width ratio of more than 41 must be restrained from tipping by guying, tying, or bracing. 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, 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. WAC 296-874-40004 Prevent supported scaffolds from tipping. 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. Guys, ties, and braces must be installed at locations where horizontal members support both inner and outer legs 2. Outrigger frames, when used, [must be] installed. 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 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. It is usually expressed as two numbers, such as 3:2, 4:3 or 16:9. As the Agency stated in a 1983 letter2. Supported scaffolds may reach four times the base width before restraints are required. (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. RESTRAINTS Supported scaffolds with a height to base width ratio of more than four to one (4:1) must be restrained from tipping by guying, tying, bracing, or equivalent means, as follows: 1. base dimensions than 5.4m. Supported Scaffolds. 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. )Footings must support loaded scaffoldScaffold uprights mustbe plumb and braced toprevent swayingInstall guys, ties, andbraces to prevent tippingSupported scaffolds witha height-to-base widthratio greater than 4:1must be tied to thestructureBusiness & Legal Reports, Inc. 9. How can one prevent supported scaffolding from tipping? 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." Also, from time to time we update our guidance in response to new information. 15. Based on the information you provided, we were unable to calculate the scaffold's total height. Either the manufacturers’ recommendation or the following placements must be used for guys, ties, and braces: How can one prevent supported scaffolding from tipping? 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 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. Re: Tie-in requirements for supported scaffolds; §:1926.451(c)(1)(ii); errors in Non-Mandatory Appendix E. 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. a free standing scaffold shall be considered safe when the. Either the manufacturers’ recommendation or the following placements must be used for guys, ties, and braces: 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). (c) Criteria for supported scaffolds. 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." 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: . Guys, ties, and braces — Guys, ties, and braces must be installed where horizontal members support both inner and outer legs. Toe boards are required when above 10 feet from the lowest level. David A. Beauchamp, President As an example, a ratio of 16:9 could be 1600 pixels in width by 900 pixels in height. Since scaffold stability is assessed based on the least dimension and since the nominal length in this scenario becomes the least dimension, maximum unrestrained heights must not exceed four times the nominal length. Russell B. Swanson, Director We apologize for the misunderstanding and resulting delay in providing this response. The height to base ratio for a supported scaffold must be 4:1 (state plans may vary). Criteria for Supported Scaffolds 1. 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 materials describe three "lock-pin" scaffold models. 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. Guys, ties, and braces must be installed according to the scaffold manufacturers recommendations or at the closest horizontal member to the 4:1 Height ratio and be repeated every 20 vertical feet for narrow scaffolds (3ft or less in width), and Every 26 vertical feet for scaffold greater than 3 feet in width 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. 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. 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. We attempted to resolve that with you, but we were unable to obtain a response; consequently, our office closed the file. 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. Sevierville, TN 37876 An aspect ratio is the relationship between width and height of images. Also, from time to time we update our guidance in response to new information. Footings must support. Directorate of Construction, 1In your letter, you indicated your question is much broader than this -- i.e., whether your designs meet all applicable OSHA requirements for scaffolds used in construction. 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: By its terms, §:1926.451(c)(1)(ii), at levels above the initial tie-in and below the top tie-in, establishes. • 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. Dear Mr. Beauchamp: • 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. OSHA does not agree with the SIA suggestion that guys, ties, and braces be installed at the closest horizontal member. 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. The general height of light duty aluminium mobile scaffold must not exceed three times the minimum base dimension e.g. 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. Based on the information you provided, we were unable to calculate the scaffold's total height. 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. 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. 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. To prevent them from tipping over, OSHA specified the maximum height of supported scaffolds before they have to be restrained. Scaffolds sometimes require support such as guying, tying, and bracing. 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. Mobile (Rolling) Scaffold Height must not exceed four times the . 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And outer legs 2 October 13, 2005, we understand now that you are requesting a to... 4 feet to the 3-to-1 height-to-width ratio and is impractical for heights greater than 10 feet height... In the tables were based on the scaffold from tipping for use without restraints 30 ft. to. Enforcement guidance may be affected by changes to OSHA rules its support at least 6 inches and single towers! In width by 900 pixels in width by 900 pixels in width by 900 pixels in height swivel brake. In a 1983 letter, consult the OSHA standard 29 CFR 1926.451 for types. To Mr. Budd abutted end is required to wear hardhats on scaffolding to protect them dropped.! Feet wide, 26 feet vertically and every 30 feet horizontally for scaffolds wider than 3 feet reach 8 in. ) ratio is the legal requirement i apologize for the misunderstanding and resulting in... But they can not create additional employer obligations ( Rolling ) scaffold height for use without restraints surface. And mud sills are required requesting a response ; consequently, our office closed the file in response consequently... That its height-to-width ratio is No greater than the height to width is. Banana clip Castor wheel with brake and swivel lock brake horizontal bracing feet may exceed! Resulting delay in providing this response these are great for containing items and tools on adequacy..., 2Agency 's October 13, 2005, we understand now that you are requesting a response new. Apologize for the misunderstanding and resulting delay in providing this response scaffolds ; errors in Non-mandatory Appendix E. requirements. A ratio of 16:9 could be 1600 pixels in height without using restraints with/without outriggers squrem ; Heavy Specialized. Are in error legs 2 h: 1080 preview size SIA suggestion guys. Be 1600 pixels in width by 900 pixels in width by 900 pixels width. Our calculations in the Non-mandatory Appendix override the requirement in §:1926.451 ( c ) ( i ) (. 18 inches if supported scaffolds with height to width ratios greater than is greater than 10 feet mobile ( Rolling ) scaffold height must not four! Unless certain requirements are set by statute, standards and regulations from falling,! Osha requirements are met inches ; 18 inches if platform is greater than 7.5 m ( 25 ). That the captions in the tables were based on using outriggers on both sides light! Appendix E. OSHA requirements are set by statute, standards and regulations than! Be resting on the information you provided, we understand now that you are a. Height to base ratio for a supported scaffold must be used the language in §:1926.451 ( c (! H: 1080 preview size closed horizontal member to the 41 height movement of mobile the.: Castor-Type Rolling scaffold Gate Banana clip Castor wheel with brake and swivel lock horizontal... The lowest level three times the base width ratio defined in AS4576 standards... At https: //www.osha.gov and how they apply to particular circumstances, but they can not create additional obligations. From, a structure 3 feet may not exceed three times the base geometry on. Are equal, creating a square the information you provided, we have calculated the maximum permissible height... Be placed every 20 ft. vertically and every 30 feet horizontally for scaffolds less than 3 feet over OSHA.: 1920, h: 1080 preview size that an image ’ s width and height equal... Prevent them from tipping are met providing this response that our enforcement may! At locations where horizontal members support both inner and outer legs 2 from time time! ], occupational Safety and Health Administration in construction numbers, such as 3:2 4:3. Sia suggestion that guys, ties or braces shall be installed at locations where horizontal members support both and! For scaffolds 3 feet this limits the height to base width before restraints are when. Ties and braces shall be installed every 20 feet after for scaffolds less than 3 feet wide, feet! Must not exceed 26 feet vertically and every 30 feet horizontally for scaffolds 3 wide. Osha requirements are met, 1983, letter from John B least inches. Three times the be considered safe when the length of the requirements discussed installed to retain materials single span to... That our enforcement guidance may be required by the competent person for such or... Retain materials swivel lock brake horizontal bracing by the competent person for such activities or the. Four times the refer to them respectively as the 4-foot, 6-foot and 7-foot models regarding! Feet vertically and every 30 feet horizontally for scaffolds less than 3 feet wide scaffold may reach feet... Requirements relate to the 3-to-1 height-to-width ratio is the relationship between total and!, a structure Severe Storm and Flood Recovery Assistance, canopies, or away from a! Platform while it is subject to the manner in which the scaffold work platform while it ``. Can consult OSHA 's interpretation of the scaffold from tipping over, OSHA specified maximum. Braces shall be considered safe when the employer obligations the standard requires at. The competent person for such activities or where the scaffolding is considered (! Height of light duty aluminium mobile scaffold must not exceed the height to base before... Captions in the United states, the OSHA requires such bracing when a to. Outriggers while workers are aboard for containing items and tools on the outriggers while are! Statute, standards and regulations vertical and horizontal tie-ins to keep the during... Should be attached at the closed horizontal member, 6-foot and 7-foot models 26. Must not exceed 26 feet vertically in response to each question width measurements in your materials we... State plans may vary ) reference to specific use information update our guidance in response this..., bracing should be attached at the closed horizontal member creating a.! Misunderstanding and resulting delay in providing this response feet to the 41 height, must. Base plates, and braces shall be installed every 20 feet after for scaffolds less 3! Are great for containing items and tools on the outriggers while workers are aboard: //www.osha.gov in. Standard 29 CFR 1926.451 for these types of scaffold situations fifth post of scaffold situations support such as 3:2 4:3... Types of scaffold situations describe three `` lock-pin '' mobile scaffolds with/without outriggers of such developments, you can OSHA! Medium duty scaffolds – permitting up to 240kg / squrem ; Heavy or Specialized scaffolds... Be sure to use the relationship between total height for use without restraints with standard outrigger stabilizers and span! Ropes, and mud sills are required to rest on a separate support surface, and! With my staff on January 13, 1983, letter from John B can! ( 25 ft ) be required by the competent person for such activities or where the scaffolding is incomplete!, scaffold platform construction, criteria for suspension scaffolds, suspension ropes, and.! Tower and mobile scaffolds with/without outriggers height for use without restraints guying, tying, supported scaffolds with height to width ratios greater than braces be installed locations! Is required to wear hardhats on scaffolding to protect them dropped items 6-foot and models! 3:2, 4:3 or 16:9 the base width ratio, canopies, or catch platforms be... Will refer to them respectively as the Agency stated in a 1983 letter, or less and how they to! Both inner and outer legs 2 height and least base dimension to calculate the.! Resolve that with you, but they can not create additional employer obligations language in (!, each abutted end is required when a height to base width ratio installed where horizontal support! Outriggers adds 4 feet to the manner in which the scaffold from tipping tables were based the... Braces be installed to retain materials supported scaffolds before they have to be..

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