29 CFR 1926 Subpart R: OSHA Steel Erection

Regulatory citation: 29 CFR 1926.750 through 1926.761, Steel Erection (Construction, Subpart R)

What Is the OSHA Steel Erection Standard?

Subpart R sets safety requirements for employers engaged in steel erection during the construction, alteration or repair of single and multi-story buildings, bridges and other structures where steel erection occurs. It covers activities such as hoisting, placing, connecting, welding, bolting and rigging structural steel, steel joists and metal buildings, and installing metal decking, curtain walls, siding and miscellaneous metals. It does not cover electrical transmission towers, communication and broadcast towers, or tanks.

The subpart assigns duties to both the steel erector and the controlling contractor.

Why Steel Erection Safety Matters

Weak footings, missing bolts or a load swung over connectors can cause a collapse or a fatal fall.

Core Obligations

1. Confirm the Site Is Ready (1926.752)

Before authorizing steel erection, the controlling contractor must give the steel erector written notice that the concrete in footings, piers and walls, or the mortar in masonry piers and walls, has reached 75 percent of its intended minimum compressive design strength or sufficient strength to support the loads of steel erection, based on an appropriate ASTM test method of field-cured samples. The notice must also confirm that any anchor bolt repairs or modifications were made as required. The controlling contractor must provide adequate access roads and a firm, graded and drained area for storage and equipment. A qualified person must prepare a site-specific erection plan when the employer uses certain alternative means and methods.

2. Inspect Cranes and Rigging and Plan Hoisting (1926.753)

Cranes used in steel erection are subject to Subpart CC. A competent person must visually inspect cranes before each shift, and a qualified rigger must inspect rigging before each shift. Routes for suspended loads must be pre-planned so no employee is directly below a load, except employees making the initial connection or hooking and unhooking the load. Multiple lift rigging is limited to five members per lift, spaced at least 7 feet apart, and requires trained employees.

3. Maintain Structural Stability (1926.754)

Structural stability must be maintained at all times. In multi-story structures, there may be no more than eight stories between the erection floor and the uppermost permanent floor, and no more than four floors or 48 feet, whichever is less, of unfinished bolting or welding above the foundation or uppermost secured floor, except where structural integrity is maintained by the design. A planked or decked floor or nets must be kept within two stories or 30 feet, whichever is less, below erection work. Shear connectors and similar devices must not be attached to top flanges until decking or another walking surface is installed.

4. Anchor Columns and Secure Connections (1926.755 and 1926.756)

Columns must be anchored by a minimum of four anchor rods, and any repair, replacement or field modification of anchor rods must be approved by the project structural engineer of record. Before the hoisting line is released, each solid web member connection must have at least two bolts per connection, of the size and strength shown on the erection drawings, drawn up wrench-tight. Perimeter columns must generally extend at least 48 inches above the finished floor for perimeter safety cables.

5. Erect Joists and Metal Buildings Safely (1926.757 and 1926.758)

Open web steel joists and systems-engineered metal buildings have their own stabilizing, bridging, connection and load placement rules.

6. Protect Against Falling Objects (1926.759)

Materials, equipment and tools not in use while aloft must be secured against accidental displacement. The controlling contractor must bar other construction processes below steel erection unless overhead protection is provided.

7. Provide Fall Protection (1926.760)

Each employee on a walking or working surface with an unprotected side or edge more than 15 feet above a lower level must be protected by guardrails, safety nets, personal fall arrest, positioning device or fall restraint systems. Connectors and employees working in a controlled decking zone (CDZ) must be protected from falls of more than two stories or 30 feet, whichever is less. A CDZ may be no more than 90 feet wide and 90 feet deep from any leading edge, may contain no more than 3,000 square feet of unsecured decking and is limited to trained employees doing leading edge work. On multi-story structures, perimeter safety cables must be installed at the final interior and exterior perimeters as soon as the metal decking is installed.

8. Train Exposed Employees (1926.761)

Training must be provided by a qualified person. All employees exposed to fall hazards must be trained in fall hazard recognition and fall protection procedures, and employees doing multiple lift rigging, connecting or CDZ work need additional special training.

Common Compliance Approaches

Written Start Authorization

Use a standard form for the controlling contractor's concrete strength and anchor bolt notice.

Training Matrix by Role

Track fall hazard, connector, CDZ and multiple lift training before assigning tasks.

Example: Steel Erection in Practice

A steel erector is framing a four-story office building. Before mobilizing, it receives written notice that footings have reached 75 percent of design strength and that two anchor rods were repaired with the engineer of record's approval. Connectors working at 25 feet tie off. The decking crew sets up a CDZ with control lines, keeps unsecured decking under 3,000 square feet, and installs perimeter safety cables as decking is completed.

Related regulations: OSHA fall protection, OSHA cranes and derricks in construction, OSHA construction safety and training.

Note: Subpart R applies to construction work involving steel erection under federal OSHA. State plan states may adopt stricter rules. Always check the current regulation text.

Frequently Asked Questions

At what height is fall protection required in steel erection?

Generally above 15 feet. Connectors and employees in a controlled decking zone must be protected from falls of more than two stories or 30 feet, whichever is less.

How many bolts are needed before releasing the hoist line?

At least two bolts per connection for solid web members, of the size and strength shown on the erection drawings, drawn up wrench-tight, or the equivalent specified by the engineer of record.

What does the controlling contractor have to do?

Duties include written notice of concrete strength and anchor bolt changes, site layout, barring work below steel erection without overhead protection, and accepting fall protection left for other trades.