Guardrail Systems
A guardrail system consists of a top rail, midrail, and intermediate vertical member. Guardrail systems can also be combined with toeboards that prevent materials from rolling off the walking/working surface.
These workers are installing guardrail systems.
If a guardrail system is required, be sure to comply with the following provisions:
- The top edge height of top rails, or equivalent guardrail system members, must be 42 inches plus or minus 3 inches above the walking-working level, except when conditions warrant otherwise and all other criteria are met (e.g., when employees are using stilts, the top edge height of the top rail must be increased by an amount equal the height of the stilts).
- Midrails, screens, mesh, intermediate vertical members, or equivalent intermediate structures, must be installed between the top edge and the walking-working surface when there is no wall or other structure at least 21 inches high.
- Midrails must be midway between the top edge of the guardrail system and the walking-working level.
- Screens and mesh must extend from the top rail to the walking-working level, and along the entire opening between rail supports.
- Intermediate members (such as balasters) between posts must be no more than 19 inches apart.
- Other structural members (such as additional midrails or architectural panels) must be installed so as to leave no openings wider than 19 inches.
- Guardrail systems must be capable of withstanding at least 200 pounds of force applied within 2 inches of the top edge, in any direction and at any point along the edge, and without causing the top edge of the guardrail to deflect downward to a height less than 39 inches above the walking-working level.
- Midrails, screens, mesh, and other intermediate members must be capable of withstanding at least 150 pounds of force applied in any direction at any point along the midrail or other member.
- Guardrail systems must not have rough or jagged surfaces that would cause punctures, lacerations, or snagged clothing.
- Top rails and midrails must not cause a projection hazard by overhanging the terminal posts.
Knowledge Check Choose the best answer for the question.
6-3. What is the required height of scaffold top rails, or equivalent guardrail system members above the walking-working level?
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