Installing Safety Rail Systems

Hello,

I am a health and safety representative from Canada. I have been asked to find out information on safety guardrails for flat top roofs. I was looking at 5-10 ft safety rails (horizontal), OSHA approved, with the capacity to withstand a force of 200 pounds.

This is a commercial roof, covered with gravel and tar. I was wondering what material works best for guardrails, what type of hardware I would need to install the rails (nuts and bolts), what type of engineer will sign off on the work, and what would the costs be for the guardrail parts.

Sorry, but I do not have more info at this time. Any input would be greatly appreciated. thanks.

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