Working at Heights JSA

Falls are the leading cause of death in US construction, and they are also the most thoroughly regulated hazard on a site. In general construction work, OSHA requires fall protection at 6 feet above a lower level — not 10, not "when it feels high". A JSA for work at heights has to say which protection is in use at which location, because "wear a harness" is not a system.

The five hazards below cover the work itself. Note that a harness is only half a system: it needs an anchorage that can take the load, a connecting means that limits the fall, and a plan for getting a suspended worker down quickly.

What the work involves

• Working on or near unprotected edges, openings and leading edges
• Installing, using or removing guardrails and covers
• Wearing and connecting personal fall arrest equipment
• Moving materials and tools at height
• Access to and from the work position — ladders, lifts, stairs

Hazards and controls

Controls are listed in hierarchy order — the further down the list a control sits, the less it should be carrying on its own.

1. Fall from an unprotected side or edge

• Eliminate the exposure: do the assembly at grade and lift it into place, or sequence the work so the edge is protected before anyone needs to be near it.
• Engineering: guardrail system on every open side — top rail at 42 inches (±3), midrail, and able to take a 200-pound force.
• Engineering: where guardrails are not feasible, a safety net or a personal fall arrest system instead.
• Administrative: a named competent person decides which system applies where, and checks it before each shift.

29 CFR 1926.501(b)(1) requires fall protection for employees on a walking/working surface with an unprotected side or edge 6 feet or more above a lower level. 29 CFR 1926.502(b) sets the guardrail criteria, including a top edge height of 42 inches plus or minus 3 inches and resistance to a 200-pound force.

2. Fall through a floor hole, skylight or shaft opening

• Engineering: cover every hole with a cover able to carry twice the expected load, secured against displacement and marked.
• Engineering: guardrails around openings that cannot be covered; treat skylights as holes, not as roofing.
• Administrative: nobody removes a cover without a replacement protection in place first.

29 CFR 1926.501(b)(4) requires employees exposed to falls through holes 6 feet or more above a lower level to be protected by covers, guardrails or personal fall arrest systems. 29 CFR 1926.502(i) sets the criteria for covers, including supporting twice the intended load and being secured and marked.

3. Fall arrest system fails — anchorage, connector or free fall distance

• Engineering: anchorages for personal fall arrest capable of 5,000 pounds per attached worker, or designed with a safety factor of at least two under the supervision of a qualified person.
• Engineering: rig to limit free fall and keep the worker clear of lower levels and obstructions — a shorter lanyard, a self-retracting device, a higher anchor.
• Administrative: inspect harness and connectors before each use; remove anything that has arrested a fall from service.

29 CFR 1926.502(d)(15) requires anchorages for personal fall arrest to support 5,000 pounds per employee attached, or to be designed with a safety factor of at least two under the supervision of a qualified person.

4. Worker left suspended after a fall

• Administrative: a written rescue plan naming who performs the retrieval, with what equipment, before work starts — prompt rescue is required, and calling 911 is not a plan on its own.
• Engineering: rescue equipment staged at the work area, not in a store 20 minutes away.
• Administrative: nobody works at height alone where a suspended worker could not be reached.

29 CFR 1926.502(d)(20) requires the employer to provide for prompt rescue of a fallen employee, or to assure that employees are able to rescue themselves.

5. Struck by tools or materials dropped from above

• Eliminate: no loose material stored at the edge; hoist and lower in closed containers.
• Engineering: toeboards, screens or debris nets on guardrails where material could fall.
• Administrative: barricade the area beneath overhead work and keep it clear.
• PPE: hard hats below, tool tethers above.

29 CFR 1926.501(c) requires protection from falling objects — toeboards, screens, guardrail systems, canopies or barricaded areas — for employees exposed to them.

A worked example row

This is how one line of the finished JSA reads, with the risk bands scored on the same 4-band matrix the generator prints:

Related work activities

• Roofing JSA
• Scaffold JSA
• Steel Erection JSA