WAC 296-874-200 General Requirements

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Your Responsibility

To make sure all scaffolds meet these requirement

You must

General Requirements for Scaffolds

WAC 296-874-20002  

Make sure scaffolds are properly designed and constructed

You must

• Make sure scaffolds are:
  • – Designed by a qualified person
    and
  • – Constructed according to that design.
• Prohibit the use of shore and lean-to scaffolds.

WAC 296-874-20004

Make sure scaffolds are erected, moved, altered, or dismantled by appropriate persons

You must

• Make sure scaffolds are erected, moved, altered, or dismantled only when the work is:
  • – Supervised and directed by a competent person qualified in scaffold erections, moving, dismantling or alteration
    and
  • – Done by experienced and trained employees selected by the competent person.

WAC 296-874-20006

Maintain structural integrity when intermixing scaffold components

You must

• Make sure intermixed scaffold components:
• – Fit together without force

and
• – Maintain the scaffold’s structural integrity.
• Make sure a qualified person determines that modifying components in order to intermix them will result in a structurally sound scaffold.
• Make sure scaffold components made of different metals aren't used together.

Exemption: Different types of metals may be used together if a competent person determines that galvanic action won't reduce the strength of any component to less than the minimum strength required.

WAC 296-874-20008

Make sure platforms are properly planked or decked

You must

• Fully plank or deck each platform between the front uprights and the guardrail supports on all working levels of a scaffold so that there's no more than one inch (2.5 cm):
  • – Between adjacent units
    and
  • – Between the platform and the uprights.

Exemption: There may be more than one inch between platform units if all of the following are met: – You can demonstrate that a wider space is necessary, such as to fit around uprights when side brackets are used to extend the platform width – The platform is planked or decked as fully as possible – The open space between the platform and the guardrail supports is 9-1/2 inches (24.1 cm) or less. Platforms used solely as walkways or only by employees erecting or dismantling scaffolds, don't have to be fully decked or planked if: – The planking provided makes for safe working conditions and – Employees on those platforms are protected from falling.

You must

• Make sure wood platforms aren't covered with an opaque finish.

Exemption: Platform edges may be covered or marked for identification.

WAC 296-874-20010

Make sure platforms meet minimum width requirements

You must

• Make sure scaffold platforms meet the minimum width requirements of Table 1, Minimum Platform Width.

Table 1
Minimum Platform Width

WAC 296-874-20012

Meet these requirements when using shorter platforms to create a longer platform

You must

• Make sure, when platforms are overlapped to create a longer platform, that:
  • – The overlap is over a support
    and
  • – The platforms are either:
• Overlapped by at least 12 inches (30 cm)
  or
• Are nailed together or otherwise prevented from moving.
• Make sure, when platforms are butted together to create a longer platform, that each abutted platform end rests on a separate support surface.

WAC 296-874-20014

Lay platform planks properly when the platform changes direction

You must

• Do the following whenever platforms overlap to change direction:
  • – First lay the platform that rests on a bearer at an angle other than a right angle
    then
  • – Lay the platform that's perpendicular to the bearer.

WAC 296-874-20016

Stabilize the ends of platforms

You must

• Make sure each end of a platform:
  • – Is cleated or restrained by hooks or equivalent means
    or
  • – Extends over the centerline of its support at least 6 inches (15 cm).
• Make sure the cantilevered portion of a platform meets at least one of the following:
• – Is designed and installed to support employees or material without tipping
• – Has guardrails which block employee access to the cantilevered end
• – Extends over its support not more than:
  
  • 12 inches (30 cm) if the platform length is 10 feet or less
    or
  • 18 inches (46 cm) if the platform length is greater than 10 feet.

WAC 296-874-20018

Keep platform sag within acceptable limits

You must

• Make sure a loaded platform doesn't sag more than 1/60 of the span.

WAC 296-874-20020

Provide safe access to scaffolds

You must

• Provide scaffold platforms more than 2 feet (0.6 m) above or below a point of access with at least one of the following means of access:
  • – Portable, hook-on, or attachable ladder
  • – Stairway-type ladder
  • – Ladder stand
  • – Stair tower (scaffold stairway or tower)
  • – Ramp
  • – Walkway
  • – Integral prefabricated scaffold access
  • – Direct access from another scaffold, structure, personnel hoist, or similar surface.
• Make sure crossbraces aren't used as a means of access.

WAC 296-874-20022

Make sure portable, hook-on, and attachable ladders meet these requirements

You must

• Position portable, hook-on, and attachable ladders so they don't tip the scaffold.
• Make sure hook-on and attachable ladders meet all of the following:
  • – Specifically designed and used for that type of scaffold
  • – Have rungs that are:
    • Uniformly spaced
    • Not more than 16-3/4 inches apart
    • At least 11-1/2 inches (29 cm) long
    • Lined up vertically between rest platforms.
    • Position the bottom rung not more than 24 inches (61 cm) above the scaffold supporting level.
    • Have rest platforms at vertical intervals not greater than 24 feet (7.3m) on supported scaffolds.

WAC 296-874-20024

Make sure stairway-type ladders meet these requirements

You must

• Make sure stairway-type ladders meet all of the following:
  • – Position the bottom step not more than 24 inches (61 cm) above the scaffold supporting level
  • – Have rest platforms not more than 12 feet (3.7 m) apart vertically
  • – Have slip-resistant surfaces on treads and landings
  • – Have steps that:
    • Are at least 16 inches (41 cm) wide
      and
    • Line-up vertically between rest platforms.
• Make sure mobile ladder stands have steps that are at least 11-1/2 inches (30 cm) wide.

WAC 296-874-20026

Make sure stair towers meet these requirements

You must

• Make sure stair towers (scaffold stairways or towers) meet all of the following:
  • – Are positioned so the bottom step isn't more than 24 inches (61 cm) above the scaffold supporting level
  • – Are at least 18 inches (45.7 cm) wide between stair rails
  • – Have slip-resistant surfaces on treads and landings
  • – Are installed at an angle of 40 to 60 degrees from the horizontal.
• Provide a landing platform at least 18 inches (45.7 cm) wide by 18 inches (45.7 cm) long at each level.
• Provide guardrails on the open sides and ends of each landing.

You must

• Make sure steps meet all of the following requirements:
  • – Line-up vertically between rest platforms
  • – Have uniform tread depth, within 1/4 inch (0.6 cm), for each flight of stairs
  • – Have uniform riser height, within 1/4 inch (0.6 cm), for each flight of stairs.

WAC 296-874-20028

Make sure stair rails and handrails meet these requirements

You must

• Provide a stair rail that meets all of the following on each side of a scaffold stairway:
  • – Has a toprail and midrail
  • – Has a toprail that can serve as a handrail if a separate handrail isn't provided
  • – Is at least 28 inches (71 cm) but not more than 37 inches (94 cm) high.

You must

• Make sure stair rail systems and handrails have:
  • - A surface that prevents employees from:
    • Being injured by punctures or lacerations
      or
    • Snagging their clothing.
  • - Ends that don't create a projection hazard.
• Make sure handrails, and top rails that are used as handrails:
  • – Provide an adequate handhold for employees to grasp to avoid falling
    and
  • – Are at least 3 inches (7.6 cm) from other objects.

WAC 296-874-20030

Make sure ramps and walkways used to access scaffolds meet these requirements

You must

• Make sure ramps and walkways aren't inclined at a slope steeper than one vertical in 3 horizontal (1:3 or 20 degrees from the horizontal).
• Make sure ramps and walkways that are inclined at a slope steeper than one vertical in 8 horizontal (1:8) have cleats to provide footing which are:
  • – Securely fastened to the planks
    and
  • – Spaced not more than 14 inches (35 cm) apart.

Reference: Ramps and walkways that are 4 feet (1.2 m) or more above a lower level need to have a guardrail system. Those requirements are found in other chapters. - For general industry activities, go to: Working Surfaces, Guarding Floors and Wall Openings, Ladders, Part J-1, in the General Safety and Health Standards, Chapter 296-24 WAC - For construction activities, go to: Floor Openings, Wall Openings, and Stairways, Part K, in the Safety Standards for Construction Work, Chapter 296-155 WAC.

WAC 296-874-20032

Make sure surfaces used to access scaffolds are close enough to use safely

You must

• Make sure a surface used to provide access to or from a scaffold isn't further from the scaffold than:
  • – 14 inches (36 cm) horizontally
  • – 24 inches (61 cm) vertically.

WAC 296-874-20034

Inspect scaffolds and scaffold components

You must

• Make sure scaffolds and scaffold components are inspected for visible defects by a competent person:
  • – Before each work shift
    and
  • – After anything occurs that could affect the scaffold’s structural integrity.

WAC 296-874-20036

Make sure damaged or weakened scaffolds meet minimum strength requirements

You must

• Make sure any scaffold or scaffold component that’s been damaged or weakened so that it no longer meets the minimum strength requirements of this chapter, is immediately either:
  • – Repaired, replaced, or braced to meet the minimum strength requriements;
    or
  • – Removed from service until repaired.

WAC 296-874-20038

Make sure scaffolds are properly loaded

You must

• Load scaffolds as specified in the:
  • – Manufacturer’s instructions
    or
  • – Design of the qualified person.
• Make sure scaffolds and scaffold components don't exceed their maximum intended load or rated load, whichever is less.

WAC 296-874-20040

Protect employees when moving scaffolds

You must

• Make sure scaffolds aren't moved horizontally while employees are on them.

Exemption: A scaffold may be moved horizontally with employees on it if the scaffold: – Has been specifically designed for such movement by a registered professional engineer or – Is a mobile scaffold that meets the requirements of the section, Meet these requirements when moving mobile scaffolds, WAC 296-874-40012.

WAC 296-874-20042

Increase employee working level height on scaffolds safely

You must

• Make sure makeshift devices, such as boxes and barrels, aren't used on scaffold platforms to increase the working level height for employees.
• Meet all of the following when using stilts on scaffolds:
  • – Use stilts only on large area scaffolds
  • – Increase the height of a guardrail system used for fall protection by an amount equal to the height of the stilts being used
  • – Make sure scaffold platforms where stilts are used are flat and free of:
    • Pits, holes, and obstructions such as debris
      and
    • Other tripping or falling hazards.
  • – Make sure stilts are:
    • Properly maintained
      and
    • The original equipment isn't altered without the manufacturer’s approval
• Meet all of the following when using ladders on scaffolds:
  • – Use ladders only on large area scaffolds
  • – Secure the platform units to the scaffold to prevent movement
  • – Secure the scaffold against the sideways thrust exerted by the ladder if the ladder is placed against a structure that’s not part of the scaffold
  • – Make sure the ladder legs are:
    • Secured to prevent them from slipping or being pushed off the platform
      and
    • On the same scaffold platform, or use other means, to stabilize the ladder against uneven platform deflection.

WAC 296-874-20044

Control loads being hoisted near scaffolds

You must

• Use a tag line or equivalent measures to control loads being hoisted onto or near a scaffold if the load could swing and contact the scaffold.

WAC 296-874-20046

Protect employees from energized power lines

You must

• Make sure scaffolds are erected, moved, altered, or dismantled so that they, and any conductive material handled on them, are kept at least as far from exposed and energized power lines as shown in Table 2, Minimum Separation Distance from Energized Power Lines.

Table 2
Minimum Separation Distance from Energized Power Lines

Exemption Scaffolds and conductive materials handled on scaffolds may be closer to power lines than the minimum separation distance specified in Table 2 if all of the following are met: – Less clearance is necessary to do the work – The utility company or electrical system operator has been notified of the need to work closer to the power lines – The utility company or electrical system operator has done at least one of the following: De-energized the lines Relocated the lines to meet the minimum separation distance requirement Installed protective coverings over the lines to prevent accidental contact

WAC 296-874-20048

Protect employees from weather hazards

You must

• Prohibit work on or from scaffolds during storms or high winds unless both of the following are met:
  • – A competent person has determined that it's safe for employees to be on the scaffold

  – The employees are protected by either:

  • A personal fall arrest system
    or
  • Windscreens.
• Make sure wind screens aren't used unless the scaffold is secured against the anticipated wind forces.

WAC 296-874-20050

Protect employees from slipping and tripping hazards

You must

• Make sure debris doesn't accumulate on platforms.
• Prohibit employees from working on scaffolds covered with snow, ice, or other slippery material.

Exemption: Employees may be on scaffolds as necessary to remove the slipping hazard.

WAC 296-874-20052

Provide fall protection for employees on scaffolds

You must

• Protect each employee on a scaffold more than 10 ft. (3.1 m) above a lower level, from falling to the lower level, by providing either:
  • – A personal fall arrest system
    or
  • – Guardrails.
• Make sure employees erecting the scaffold install the guardrail system, if required, before the scaffold is used by any other employees.

WAC 296-874-20054

Provide fall protection if a scaffold is too far from the work face

You must

• Provide a guardrail system along the front edge of the platform, or have employees use a personal fall arrest system, if the distance from the front edge of the platform to the work face is greater than:
  • – 18 inches (46 cm) for scaffolds used for plastering and lathing operations.
  • – 14 inches (36 cm) for all other scaffolds

WAC 296-874-20056

Provide specific fall protection for specific types of scaffolds

You must

• Use a personal fall arrest system to protect employees on the following scaffolds:
  • – Boatswain's chair
  • – Catenary scaffold
  • – Float scaffold
  • – Ladder jack scaffold
  • – Needle beam scaffold.
• Use a personal fall arrest system and a guardrail system to protect employees on:
• – Single-point adjustable suspension scaffolds
  and
• – Two-point adjustable suspension scaffolds.
• Protect employees working on a self-contained adjustable scaffold that has the platform:
  • – Supported by the frame structure, using a guardrail system with a minimum 200 lb. toprail capacity.
  • – Suspended by ropes, using:
    • A guard rail system with a minimum 200 lb. toprail capacity
      and
    • A personal fall arrest system.
• Protect employees on walkways located within a scaffold by using a guardrail system that meets all of the following:
  • – Has a minimum 200 lb. toprail capacity
  • – Is installed within 9-1/2 inches (24.1 cm) of the walkway
  • – Is installed along at least one side of the walkway.

WAC 296-874-20058

Make sure personal fall arrest systems meet these requirements

You must

• Make sure personal fall arrest systems used on scaffolds for general industry activities, meet the requirements of Personal Fall Arrest System, Appendix C, Part 1, WAC 296-24-88050, in Powered Platforms, Part J-3, found in General Safety and Health Standards,
  Chapter 296-24, WAC.
• Make sure personal fall arrest systems are attached by a lanyard to one of the following:
• – Vertical lifeline
• – Horizontal lifeline
• – Appropriate structural member of the scaffold

WAC 296-874-20060

Make sure vertical lifelines used with personal fall arrest systems meet these requirements

You must

• Make sure vertical lifelines are all of the following:
  • – Fastened to a fixed, safe point of anchorage
  • – Independent of the scaffold
  • – Protected from sharp edges and abrasion.

You must

• Make sure vertical lifelines, independent support lines, and suspension ropes are not attached to any of the following:
• – Each other
• – The same point of anchorage
• – The same point on the scaffold.
• Make sure vertical lifelines, independent support lines, and suspension ropes don't use the same point of anchorage.
• Make sure independent support lines and suspension ropes aren't attached to a personal fall arrest system.
• Make sure vertical lifelines aren't used with single-point or two-point adjustable suspension scaffolds that have overhead components such as overhead protection or additional platform levels.

 

WAC 296-874-20062

Make sure horizontal lifelines used with personal fall arrest systems meet these requirements

You must

• Equip single-point or two-point adjustable suspension scaffolds that use horizontal lifelines or structural members of the scaffold for fall protection with both of the following:
• – Additional independent support lines that are equal in number and equivalent in strength to the suspension ropes
• – Automatic locking devices capable of stopping the scaffold from falling if one or both of the suspension ropes fail.
• Make sure horizontal lifelines are secured to either:
• – Two or more structural members of the scaffold
  or
• – Looped around both the suspension ropes and independent support lines above the hoist and brake attached to the end of the scaffold.
• Make sure independent support lines and suspension ropes are not
  • – Attached to each other or the same point on the scaffold
  • – Attached to or use the same point of anchorage.
• Make sure independent support lines and suspension ropes aren't attached to either:
• – A personal fall arrest system
  or
• – The same point on the scaffold as a personal fall arrest system.
• Make sure, if a horizontal lifeline is used where it may become a vertical lifeline, that the device used to connect a lanyard to the horizontal lifeline is capable of locking in both directions on the lifeline.

WAC 296-874-20064

Make sure guardrail systems meet these requirements

You must

• Make sure guardrails, if required, are installed along all open sides and ends of platforms.

Exemption: For employees doing overhand bricklaying operations from a supported scaffold, a guardrail isn't required on the side next to the wall.

You must

• Make sure the height of the toprail top edge, or the equivalent member, of supported scaffolds is:
  • – At least 36 inches (0.9 m) and not more than 45 inches
    (1.2 m) above the platform surface for scaffolds manufactured or first placed in service before January 1, 2000
  • – At least 38 inches (0.97 m) and not more than 45 inches
    (1.2 m) above the platform surface for scaffolds manufactured or first placed in service after January 1, 2000.
• Make sure the height of the toprail top edge, or the equivalent member, of suspended scaffolds that require guardrails and personal fall arrest systems, is at least 36 inches (0.9 m) and not more than 45 inches (1.2 m) above the platform surface.

WAC 296-874-20064

Exemption: When conditions warrant, the height of the top edge of the toprail may be greater than 45 inches if the guardrail system meets all other criteria of this chapter.

You must

• Make sure the top edge of the toprail doesn’t drop below the required height when the minimum load, shown in Table 3, Minimum Toprail and Midrail Strength Requirements, is used.
• Each toprail and midrail, or equivalent member, of a guardrail system must be able to withstand, without failure, the force shown in Table 3, Minimum Toprail and Midrail Strength Requirements, when the force is applied as follows:
  • – To the toprail in a downward or horizontal direction at any point along its top edge
  • – To the midrail in a downward or horizontal direction at any point.

You must

• Install midrails, screens, mesh, intermediate vertical members, solid panels, or equivalent structural members as follows:
• – Midrails at a height approximately midway between the top edge of the guardrail system and the platform surface
• – Screens and mesh:
  • From the top edge of the guardrail system to the scaffold platform
    and
  • Along the entire opening between the supports
• – Intermediate members, such as balusters or additional rails, not more than 19 inches (48 cm) apart.
• Make sure steel or plastic banding isn't used as a toprail or midrail.

WAC 296-874-20064

You must

• Have a competent person inspect manila rope and plastic or other synthetic rope that's used as a toprail or midrail as frequently as necessary to make sure it continues to meet the strength requirements for a toprail or midrail.

You must

• Make sure guardrails have a surface that prevents:
• – Puncture and laceration injuries
  and
• – Snagging clothing.
• Make sure any rail extending beyond the post of a guardrail doesn't create a projection hazard.

WAC 296-874-20066

Provide falling object protection

You must

• Protect employees from being struck by tools, materials, or equipment falling from a scaffold by doing one or more of the following
:
• – Use a barricade to keep employees out of the area where falling objects could be a hazard
• – Install a toeboard along the edge of the platform anywhere an object could fall on an employee below
• – Install paneling or screening that covers from the top of the guardrail to the toeboard or platform anywhere the toeboard is not high enough to keep objects from falling off the platform
• – Install a guardrail system with openings small enough to keep potential falling objects from passing through
• – Erect a canopy structure, debris net, or catch platform over employees that does all of the following:
• Will contain or deflect falling objects
• Is strong enough to withstand the impact forces
• Is installed between the falling object hazard and the employees.
• Make sure potential falling objects that are too large or heavy to be contained or deflected by the falling object protection you're using, are:
• – Moved away from the edge of the surface they could fall from
  and
• – Secured, as necessary, to prevent falling

WAC 296-874-20068

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