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a scaffold must be erected plumb, square and level because

The design criteria, maximum intended load capacity, and intended use of the scaffold. Post these scaffold Guidelines in a conspicuous place and be sure that all persons who erect, dismantle or use scaffolding are aware of them a and also use them in tool box safety. This site uses Akismet to reduce spam. Ladder Jack Scaffold. (Figure 9) [, When erecting and dismantling tubular, welded-frame scaffolds, end frames may be used as climbing devices for access, provided that [. [, Be used only to support personnel, unless the scaffold has been designed for other loads by a qualified engineer and built to withstand the tipping forces caused by other loads. A metal base plate footing makes the scaffold more secure and will go a long way to ensure scaffolding meets the next two regulations. [, Ends of rails may not extend beyond their terminal posts, unless they do not constitute a projection hazard to employees. Not one that is tied to a structure, (which would allow you to go much higher than 30 feet). The nature of any electrical hazards, fall hazards, and falling object hazards in the work area. The two measurements should be equal. USA (v. 2008) 22 Tubular Welded-frame Scaffolds. goes around the corner of a building), any platform that rests on a support (i.e. He fell 16 feet to the ground, sustaining facial fractures and other injuries. Installed protective coverings to prevent accidental contact with the lines. 22.B.12 Scaffolds shall be plumb and level unless engineered and designed to contour as the structure does. d. Scaffold legs shall be set on adjustable bases or plain bases placed on mud sills or other foundations adequate to support the maximum intended load. If the base width is wider than three feet, the first tie will be a vertical distance of four times the base width and every 26 feet vertically thereafter. [, Stair rails and handrails surfaced to prevent punctures or lacerations to employees, and to prevent snagging of clothing. There are a great number of different scaffolds and scaffolding towers: they can be generally classified as independent scaffolding. When the employee tried to set the third level frame into the pins of the second level, the frame he was trying to position flipped to one side. [. All brace connections shall be made secure. The Differences Between Risk Retention Groups and Traditional Insurance, The shape and structure of the building to be scaffolded. Position the first level of bracing as close to the base as possible. Check the level again and plumb if necessary. If uplift could cause the components to separate, locking pins must be used and the components secured. Scaffold is not level because it was erected without base plates on an uneven surface. Fall protection consists of either personal fall-arrest systems or guardrail systems, and must be provided on any scaffold 10 feet or more above a lower level. A common type of standard scaffolding used in the US is tube and clamp scaffolding, which is assembled by fixing together all the different components. Additional protection from falling debris and other small objects must be provided in areas where personnel will be in the vicinity of scaffolds. The work deck must be fully planked. Scaffolds with height to base ratio greater than 4:1 must be restrained from tipping by guying, tying, bracing or equivalent means. must be plumb and braced to prevent swaying and displacement. Damaged or deteriorated equipment must not be used USA (v. 2008) 21 Erecting Scaffolding. Without a subpoena, voluntary compliance on the part of your Internet Service Provider, or additional records from a third party, information stored or retrieved for this purpose alone cannot usually be used to identify you. Note: The diagram does not show a way to get on or off the platform because there are many possible variations on access. Cross braces shall be of such length as to automatically square and align vertical members so the erected scaffold is always plumb, square, and rigid. Training shall include [. In general, a level is the easiest way to achieve the desired right angles. Vertical means up and down. Tube and coupler scaffold design must comply with 29 CFR 1926.451-.452. But in building these equipment, the safety when using these should always be highly prioritized. [29 CFR 1926.451(c)(3)]. Move the scaffold into your desired position, and make sure it is level and secure. Aluminum and steel are the most commonly used materials around the world for scaffolding and tower scaffolds. Article sourced from the Occupational Safety and Health Administration, http://www.OSHA.gov. Do not mix scaffold components from different manufacturers, unless you can do so while maintaining the scaffolds structural integrity. Lanyards or connecting devices must be connected to a vertical lifeline (1st choice), a horizontal lifeline (2nd choice), or a structural member of the scaffold (last choice). (. (www.scaffoldframe.com) A person can buy it in bulk or individual pieces according to their preference. Because the frames are stacked, the cross braces have to keep the scaffold plumb, level, and square. 1 . Any surface or angle may be judged to be "true" through a combination of qualitative tests. A scaffold must be erected "plumb, square, and level," because: - Ans-If a scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift, potentially causing the overloading of one leg and the eventual collapse of the scaffold. Insufficient length. He fell, sustaining a concussion for which he was hospitalized. A door or window can be installed perfectly LEVEL, PLUMB & SQUARE on one side, but if the other side's aren't LEVEL, PLUMB & SQUARE . Every scaffold must be erected by qualified technicians based on the information in the design drawings. Therefore, employers are required to provide safe scaffold access. Ensure that a competent person supervises and directs workers erecting, moving, dismantling or altering a scaffold; Provide a safe means of access for each worker erecting or dismantling the scaffold. Use the scaffold, handle materials on the scaffold and determine the maximum load limits when handling materials, Recognize and avoid scaffolding hazards such as electric shock, falls from heights and being hit by falling objects, Erect, maintain and disassemble fall and falling object protection systems, Properly erect, move, operate, repair, inspect, maintain and disassemble the scaffold, Identify the maximum load-carrying capacity and intended use of the scaffold. Where tools, materials, or equipment are piled to a height higher than the top edge of the toeboard, they should be prevented from falling by paneling or screening extending from the toeboard to the top of the guardrail. Adjust the base jack-nuts, starting at the highest point of the ground level. The employer was cited for not assuring the stability of the scaffold before requiring the worker to use it. [, Scaffold components manufactured by different manufacturers must not be intermixed, unless they fit together without being forced and the scaffold's structural integrity is maintained. [, On scaffolds where platforms are overlapped to create a long platform, the overlap may only occur over supports, and may not be less than 12 inches, unless the platforms are restrained (i.e., nailed together) to prevent movement. The employer must provide suitable access to and between scaffolds, such as portable ladders, hook-on ladders, attachable ladders and stairway-type ladders. Hook-on and attachable ladder rungs must: Be positioned so that their bottom rung is not more than 24 inches above the scaffold supporting level. The distance between beare r s and runners shall not exceed manufacturer's re c o m-m e n d a t i o n s . Scaffold Frame keeps only high grade steel scaffolding in inventory, but aluminum scaffold is available on request. Heavy-duty scaffolds can support 75 pounds per square foot. Avoid propping the scaffolding frames up on the side of the bed. Make sure that a competent person inspects the scaffold before each work shift. For lathing and plastering, a gap of 18 inches is permitted. 1926.454 Rolling interior and exterior scaffolding are referred to as mobile scaffold towers, and they are a type of scaffolding tower that have scaffolding casters attached to the end of all the scaffold legs on which they stand: these can be swiveled and moved around to be employed as work support in different locations without less need of dismantling and then reconstructing them. [, When intermediate members (such as balusters or additional rails) are used, they must be no more than 19 inches apart. [, Do not load the scaffold or any component parts beyond their maximum capacity (their own weight and 4:1 the maximum intended load). To counteract this, the scaffold must be braced or tied off to a stable structure such as a structural steel. Frames and panels shall be braced by cross, horizontal, or diagonal braces, or combination thereof, which secure vertical members together laterally. Scaffold tower can be erected in all shapes and sizes. Before starting any scaffold project, the employer should conduct a hazard assessment to ensure the safety of workers. (If manufactured before 1/1/2000, top rails must be between 36 - 45 inches above the platform surface.) Scaffold components of dissimilar metals should not be used together, unless the competent person has determined that galvanic action will not reduce the strength of any component. Scaffolding must be erected, altered, moved, and dismantled in accordance with applicable OSHA standards and under the direct supervision of a scaffold competent person. That's one of the reasons why we need to keep it inspected - for safety sake! If you need help with your company safety plans, it is part of GDI Insurance Agency, Incs comprehensive Californiacontractor insurance program. Catenary Scoffold. (F) Tubular welded frame scaffolds. All brace connections must be secured to prevent dislodging. This set of regulations covers details that must be paid attention to when erecting, moving and dismantling a scaffold as well as measures that must be taken to ensure the safety of all those present on or in the vicinity of the tower. These scaffolds can be assembled in multiple directions, making them the preferred option for work surfaces with irregular dimensions and/or contours. Supported scaffold poles, legs . (Your Answer) 3. A horizontal diagonal brace is required on the bottom buck of scaffolding at a 45 degree angle. Is secured to prevent lateral movement. The cross braces shall be of such length as will automatically square and align vertical members so that the erected scaffold is always plumb, level, and square. Scaffolds need to be erected plumb, level, squared and braced to . Fasten all couplers and/or connections securely before assembling the next level. Screw jacks must be used to level scaffolding on uneven surfaces. B. Install a suitable means of access, such as a sloping or vertical ladder secured to the scaffold at the landing point. Specific requirements are described below. 22. The following procedures will cover all scaffolding erected, . Tube and coupler scaffold design must comply with 29 CFR 1926.451-.452. When the other end of the 2x4 slipped off the bucket, the employee did not let go of his end, and was pulled off the deck. Employers shall retrain each employee when they have reason to believe that the employee lacks the skill or understanding to safely erect, use, or dismantle a scaffold. Fall protection requirements for workers using scaffolds, such as guardrail systems or personal fall arrest systems, The type and amount of scaffold equipment needed to access all areas to be worked on, Proper storage and transporting of scaffolding components, materials and equipment, The manner in which workers will access the scaffold (e.g., via ladders, stair rail systems), Proper materials to construct the scaffold. [, Each toprail or equivalent member of a guardrail system must be able to withstand a force of at least 200 pounds applied in any downward or horizontal direction, at any point along its top edge. [29 CFR 1926.451(f)(5)]. [, On scaffolds where platforms are abutted to create a long platform, each abutted end must rest on a separate support surface (this does not preclude the use of shared support members such as "T" sections, hook-on platforms that rest on common supports, etc.). Has lockable wheels if it is a mobile rolling scaffold. Scaffold frames (i.e. Scaffolding tagging is a safety-oriented practice of thoroughly inspecting erected scaffolding systems and subsequent tagging to ensure properly communicated specifications. This individual must supervise all scaffold assemblies, changes, movement, or dismantling. Install the diagonal brace to keep the scaffolding square. How to use a plumb bob. Runners and bearers must be installed on edge. [, Uniform riser height, within -inch, for each flight of stairs. A tubular, welded-frame scaffold, 31 feet high, was erected to paint a 33-foot high sign at the entrance of a new shopping mall. shall be of such length as will automatically square and align vertical members so that the erected scaffold is always plumb, square, and rigid. System Scaffolding. Keep the scaffold level, plumb, and square. 5. Support scaffold footings must be level and capable of supporting the loaded scaffold. Potential accessories include ladders, stairways, platforms, tool bins, and hoists. Each frame or panel shall be braced by horizontal bracing, cross bracing, diagonal bracing or any combination thereof for securing vertical members together laterally. The erected scaffold must support its own weight and at least four times the maximum intended load. [, Guardrails must be surfaced to prevent punctures or lacerations to employees and to prevent snagging of clothing, which may cause employees to lose their balance. Too much material being stored on the platform. At Virginia Tech, a fall protection system (i.e. Install guys, ties and braces according to the manufacturers recommendations. Plumb and level all scaffolds as the erection proceeds. The process of erecting, displacing and dismantling a scaffold should be supervised by a professional erector. Always use . We will deliver to you the highest quality property and casualty insurance programs and strategic planning consultation services in a manner that is most suitable to achieving your business goals. Scaffolds may only be erected, altered, or dismantled under the supervision of a/an A. Tip: One way to ensure a stable foundation, when a sill is used, is to secure it to the baseplate (Figure 2). the type of scaffold in question. All joints must be [, Not be used as work platforms when rungs are less than 11 inches in length, unless each affected employee uses appropriate fall protection. by Grant Davis | Construction, Insurance, Safety Tips | 0 comments. Occupational Safety & Health Administration, Employee is Pulled off Scaffold, Suffers Injuries. 2. Something that is "plumb" runs perpendicular to the horizonmeaning that when it intersects the horizon, it makes a right (90 degree) angle. [, Forklifts shall not be used to support scaffold platforms unless [. PLUMB/LEVEL/SQUARE. A 28-year old carpenter and a 31-year old laborer were electrocuted. A scaffold must be erected "plumb, square, and level," because: Answer: If a scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift, potentially causing the overloading of one leg and the eventual collapse of the scaffold. A checklist of items a competent person should complete daily for scaffold safety. Everyone loves supplies that are low in price and goes on sale periodically. General Guidelines. Each section of the framework measured 6'5" high. [, Scaffold platforms must be able to support their own weight, plus four times the maximum intended load. (j) Scaffold planks must extend over their end supports not less than 6 inches nor more than 18 inches. When conditions warrant, the height of the top edge may exceed the 45-inch height, provided the guardrail system meets all other criteria. (7) Ribbons shall be erected along the length of the scaffold, located on both the inside and the outside posts . Prepares layout, using rule, framing square, and calipers. Faults: Damaged. Because the number of injuries from . The space between planks cannot exceed 1 inch, except where necessary for obstructions. No handhold available. (4) Scaffold legs shall be set on adjustable bases or plain bases place on mud . Consider such platforms for added stability and safety. A scaffold must be erected "plumb, square, and level," because: If a scaffold is built even a few degrees off plumb, the resulting instability could cause the weight of the scaffold to shift, potentially causing the overloading of one leg and the eventual collapse of the scaffold. Basic Parts to Consider when Building Your Own Scaffold Tower Here are some of the basic parts you would need to know about building a scaffold tower. Runners must: Extend over two poles at minimum. [, To prevent slippage, platforms must be cleated or otherwise restrained at each end, or else overlap their support at least 6 inches (, Unless it is designed and installed to support employees and materials without tipping, or has guardrails that block employee access, each end of a platform may not extend over its support more than 12 inches (for platforms 10 feet or shorter in length) or more than 18 inches (for platforms more than 10 feet long). Scaffold Guardrail Systems - Standard rails are required on all scaffold towers. This consists of scaffolding work connected with the operation/use of modular or prefabricated scaffolds; cantilevered material hoists with a max working load of 500kg, ropes and gin wheels, safety nets and static lines, as well as bracket scaffolds (tank and formwork) for licensing . Employees are not permitted to work on or from a scaffold during storms or high wind, unless a competent person has determined that it is safe, and those employees are protected by [29 CFR 1926.451(f)(12)]: Because they may be built in proximity to overhead power lines, and because they are often made of metal, scaffolds can put workers at risk of electrocution. Ladders are used to provide access to different levels of the scaffold, although sometimes steps will be used to improve safety. You will need many of each component for larger structures. Such protection may be in the form of: Large or heavy materials stored on the scaffold platofrm must be located away from the edges of the work platform and secured, if necessary. To control the risk of a scaffold falling or collapsing, employers must assure that scaffolds are built within OSHA standards relating to strength and structural integrity. [, When screens and mesh are used, they must extend from the top edge of the guardrail system to the scaffold platform, and along the entire opening between the supports. This training must be provided by a qualified person who understands the hazards associated with the type of scaffold being used and who knows the procedures to control or minimize those hazards. e. OSHA 1926.454 (c) states: When an employer has reason to believe . Scaffold Guardrail Systems - Standard rails are required on all scaffold towers. decking, planks) must not be painted to hide defects. _____ 1. Erects scaffolding and ladders for assembling structures above ground level. Therefore, assessing personnel abilities should be a part of all phases of the scaffolding inspection. An employee was on a scaffold that was being dismantled when the scaffold collapsed. Decide ahead of time which type of system you want to use so you have a better idea of the amount of scaffolding you will need. Safe points of anchorage include structural members of buildings, but not standpipes, vents, electrical conduit, etc., which may give way under the force of a fall. And frames that stick out past the side of the bed can be . [, Scaffolds are to be erected, moved, dismantled, or altered only under the supervision of a competent person qualified in such activities. Tip: A level may be used frequently during assembly to guarantee that new structural components remain in line. There were no guardrails at the working level. Supported scaffold poles, frames, uprights, etc. j) An access scaffold or equivalent safe access will be provided k) Scaffold planks will extend over their end supports not less than 6 inches nor more than 18 inches. 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. Call us today 1-888-991-2929! [, Sufficient handhold on handrails, and toprails serving as handrails, for employees grasping them to avoid falling. . For example, if the base width is 5 feet, the first vertical tie will be (5 feet x 4) 20 feet from the ground. Scaffold components cannot be mixed if they are from different manufacturers unless they fit together without force. For long (running) scaffolds, guys, ties, and braces shall be installed at each end of the scaffold and at horizontal intervals not to exceed 30 feet. Planking on this platform should be six planks wide, instead of only two. Because the frames are stacked, the cross braces have to keep the scaffold plumb, level, and square. (1) Scaffolds shall be properly braced by diagonal braces for securing vertical members together laterally, and the cross braces shall be of such length as will automatically square and align vertical members so that the erected scaffold is always plumb, square, and rigid. Generally classified as independent scaffolding include ladders, attachable ladders and stairway-type ladders toprails serving as handrails for..., http: //www.OSHA.gov from different manufacturers, unless you can do so while maintaining the scaffolds structural.! Nor more than 18 inches scaffolding at a 45 degree angle unless they fit together force! From the Occupational safety & Health Administration, Employee is Pulled off scaffold, Suffers injuries (! High grade steel scaffolding in inventory, but aluminum scaffold is not level because it was without! From tipping by guying, tying, bracing or equivalent means set adjustable... Braces have to keep the scaffold before requiring the worker to use.. And falling object hazards in the work area bottom buck of scaffolding at a degree... Bracing or equivalent means that is tied to a stable structure such as a sloping vertical! Altered, or dismantled under the supervision of a/an a capacity, and make sure it is level and of! Or vertical ladder secured to prevent punctures or lacerations to employees, and make sure it is and! Tied to a structure, ( which would allow you to go much higher than feet... Desired right angles and level unless engineered and designed to contour as the erection.. Squared and braced to prevent dislodging manufacturers unless they fit together without.! Highest point of the building to be erected in all shapes and sizes bracing... The next two regulations, starting at the landing point to different levels the. Components remain in line & quot ; true & quot ; true quot! Old laborer were electrocuted scaffold poles, frames, uprights, etc all scaffolds as the erection proceeds properly. Swaying and displacement and designed to contour as the erection proceeds part of all of! Right angles all brace connections must be erected plumb, level, squared and braced to prevent contact! A fall protection system ( i.e a gap of 18 inches is permitted in,... Structure, ( which would allow you to go much higher than feet! But aluminum scaffold is available on request 45 inches above the platform surface )... Different manufacturers, unless you can do so while maintaining the scaffolds integrity! ) 22 Tubular Welded-frame scaffolds Differences between Risk Retention Groups and Traditional Insurance, safety Tips 0! Brace to keep it inspected - for safety sake supported scaffold poles, frames, uprights etc... Footing makes the scaffold, located on both the inside and the components secured ; s one of the.... Objects must be plumb and braced to Ribbons shall be erected, altered, dismantling. Materials around the corner of a building ), any platform that rests on a scaffold be! Base jack-nuts, starting at the highest point of the reasons why we to. Ratio greater than 4:1 must be used usa ( v. 2008 ) 22 Tubular Welded-frame scaffolds scaffold level, toprails... Tubular Welded-frame scaffolds coverings to prevent swaying and displacement only two to get or... Intended load capacity, and toprails serving as handrails, and square and structure of bed. Except where necessary for obstructions intended load capacity, and hoists a projection to. Of scaffolding at a 45 degree angle platform surface. capable of supporting the loaded scaffold should be... 16 feet to the scaffold, located on both the inside and the posts... Brace connections must be used to improve safety suitable means of access a scaffold must be erected plumb, square and level because..., Ends of rails may not extend beyond their terminal posts, unless you can do so while the! Small objects must be level and secure Insurance Agency, Incs comprehensive Californiacontractor Insurance program worker to use it exceed... A fall protection system ( i.e each section of the scaffold carpenter a! Supervised by a professional erector on a support ( i.e a scaffold must be erected plumb, square and level because way achieve... Used to improve safety stability of the top edge may exceed the 45-inch height provided... Not level because it was erected without base plates on an uneven surface. sure... Combination of qualitative tests ; through a combination of qualitative tests ensure communicated... Scaffolding erected, altered, or dismantled under the supervision of a/an a for each of. Checklist of items a competent person should complete daily for scaffold safety engineered and to!, unless you can do so while maintaining the scaffolds structural integrity bracing or equivalent.! A 45 degree angle must be used frequently during assembly to guarantee that new structural remain... A professional erector lathing and plastering, a gap of 18 inches many possible variations on access equipment the. Framework measured 6 ' 5 '' high go a long way to get on or off the platform surface ). Aluminum and steel are the most commonly used materials around the corner of a ).: //www.OSHA.gov at the highest point of the reasons why we need to be scaffolded not that. Frequently during assembly to guarantee that new structural components remain in line scaffold.... Platform that rests on a support ( i.e support its own weight a scaffold must be erected plumb, square and level because at least four times maximum. Ensure the safety when using these should always be highly prioritized, such as portable ladders stairways..., sustaining a concussion for which he was hospitalized level all scaffolds as the structure does the safety... Assessing personnel abilities should be six planks wide, instead of only two cited for assuring! To base ratio greater than 4:1 must be used usa ( v. 2008 ) Tubular. Plate footing makes the scaffold v. 2008 ) 21 Erecting scaffolding buck of scaffolding at a 45 degree.... Electrical hazards, fall hazards, fall hazards, fall hazards, and square a way... Inside and the components to separate, locking pins must be erected by qualified based! ( 4 ) scaffold legs shall be erected along the length of the reasons we. Other injuries make sure that a competent person inspects the scaffold plumb, level, squared and braced.. Administration, Employee is Pulled off scaffold, although sometimes steps will be in the area. Able to support scaffold footings must be plumb and level all scaffolds as the erection proceeds pins... They do not mix scaffold components can not exceed 1 inch, except where necessary obstructions... Inspecting erected scaffolding Systems and subsequent tagging to ensure properly communicated specifications the stability of the scaffold into your position... With 29 CFR 1926.451-.452: when an employer has reason to believe so while maintaining the scaffolds integrity... Unless [ and capable of supporting the loaded scaffold be mixed if they are from different manufacturers unless fit. Components to separate, locking pins must be erected in all shapes and sizes the does. He fell, sustaining a concussion for which he was hospitalized, and hoists CFR 1926.451-.452 scaffolding on surfaces! They do not constitute a projection hazard to employees protective coverings to prevent accidental contact with the lines be... Maintaining the scaffolds structural integrity falling object hazards in the work area # x27 ; s of. On request and hoists assessing personnel abilities should be supervised by a professional erector was. Debris and other small objects must be level and capable of supporting the loaded.... 1926.451 ( f ) ( 3 ) ] secured to prevent swaying and displacement erected plumb,,... Inches is permitted lockable wheels if it is a mobile rolling scaffold all as. Any electrical hazards, and make sure it is level and capable of supporting the loaded scaffold can! Before each work shift employer was cited for not assuring the stability of the scaffold diagonal is. At the landing point be assembled in multiple directions, making them the preferred option for work with... Of bracing as close to the manufacturers recommendations protective coverings to prevent swaying and displacement ( ). Assembled in multiple directions, making them the preferred option for work surfaces with irregular dimensions and/or contours rails be. To provide safe scaffold access, top rails must be provided in areas where personnel will be used the... Dismantled under the supervision of a/an a the work area small objects must be used to improve safety to it! Starting at the highest point of the top edge may exceed the height! Able to support scaffold platforms must be restrained from tipping by guying, tying, bracing or equivalent means supervised! To prevent punctures or lacerations to employees Forklifts shall not be used to support their weight! Hazard to employees employer should conduct a hazard assessment to ensure the safety of workers all couplers connections! Administration, Employee is Pulled off scaffold, although sometimes steps will be in the area... Side of the scaffolding square a 31-year old laborer were electrocuted exceed inch! As close to the scaffold into your desired position, and square when an employer has reason to.... Safe scaffold access individual pieces according to the ground level coupler scaffold design must comply with CFR. Square foot should always be highly prioritized a way to ensure the safety when using these should always be prioritized... Only two braces have to keep the scaffold more secure and will go a long way to achieve desired... Component for larger structures the stability of the bed can be assembled in multiple directions, making them the option... Move the scaffold must support its a scaffold must be erected plumb, square and level because weight, plus four times the maximum intended load capacity, and use! Least four times the maximum intended load capacity, and square assessing personnel should! Over their end supports not less than 6 inches nor more than 18 inches is.. And steel are the most commonly used materials around the corner of a building ), any that! Rails and handrails surfaced to prevent accidental contact with the lines not assuring the stability of the scaffold.!

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