Count the rods, verify the 300-pound design line, and confirm any repair notice before the column is set, as required by Legal Information Institute.
Key takeaways for what to check on the anchor rods before a steel column is set
- Before the steel column is stood up, verify the anchor rod count against the federal standard. The rule states that all columns shall be anchored by a minimum of 4 anchor rods (anchor bolts), according to Legal Information Institute. This count is the baseline check for the pre-erection phase.
- Check the design load line for each assembly. Each column anchor rod assembly, including the column-to-base plate weld and the column foundation, shall be designed to resist a minimum eccentric gravity load of 300 pounds (136.2 kg) located 18 inches (.46m) from the extreme outer face of the column in each direction at the top of the column shaft, according to Legal Information Institute. This 300-pound line is a design specification, not a field load test the crew performs.
- Confirm whether any repair or modification occurred. Anchor rods shall not be repaired, replaced or field-modified without the approval of the project structural engineer of record, according to Legal Information Institute. If such work happened, the controlling contractor shall provide written notification to the steel erector prior to the erection of the column, according to Legal Information Institute.
- Write the rod count and the status of the written notice on today's site record. See Construction Daily Log Checklist for Supervisors. Keep the 4-rod count, the 300-pound design line, and the written-notice line as separate checks in your log.
What to check before the column is set, in one paragraph
Before the steel column is stood up, the contractor must verify that the anchor rod assembly meets the specific design and notification requirements outlined in the federal regulations. The primary check involves confirming that the column is anchored by a minimum of 4 anchor rods, a requirement explicitly stated in the rule for all columns according to Legal Information Institute. This count is the baseline for the physical anchorage of the structure. In addition to the quantity, the crew must ensure the design specifications are met, specifically that each column anchor rod assembly is designed to resist a minimum eccentric gravity load of 300 pounds located 18 inches from the extreme outer face of the column in each direction at the top of the column shaft according to Legal Information Institute. This design line covers the column-to-base plate weld and the column foundation. If any anchor rod has been repaired, replaced, or field-modified, the controlling contractor must provide written notification to the steel erector prior to the erection of the column according to Legal Information Institute. Such repairs cannot be performed without the approval of the project structural engineer of record according to Legal Information Institute. The contractor should document the rod count, the design verification, and any written notices on the site record.
The 4-rod minimum on the federal page
The federal column anchorage rule sets a specific minimum for the hardware holding the steel in place. Under 29 CFR § 1926.755, all columns must be anchored by a minimum of 4 anchor rods, which the text also refers to as anchor bolts, according to Legal Information Institute. This count is the baseline for the physical connection between the column and the foundation.
Beyond the count, the rule defines how each individual assembly must be engineered. Each column anchor rod assembly, which includes the column-to-base plate weld and the column foundation, must be designed to resist a minimum eccentric gravity load of 300 pounds (136.2 kg), according to Legal Information Institute. This load is located 18 inches (.46m) from the extreme outer face of the column in each direction at the top of the column shaft. The 300-pound figure is a design requirement for the assembly's capacity, not a field test that the crew performs with a scale or load cell.
Keep the 4-rod count and the 300-pound design line as separate items in your pre-erection checklist. One is a quantity check; the other is a design verification. Confirming that four rods are installed does not automatically confirm that the assembly is designed for the 300-pound eccentric load. You need both pieces of information to satisfy the rule. If the engineer’s stamp or the calculation package is missing the reference to the 300-pound eccentric gravity load, flag it before the crane picks up the column. See Log lifting sling inspections: 6 checks before the lift.
The same count on the California and Washington pages
The California Code of Regulations, Title 8, Section 1710. Structural Steel Erection states: "(A) All columns shall be anchored by a minimum of 4 anchor rods (anchor bolts)." according to California Department of Industrial Relations. This matches the federal requirement exactly. The state does not add a higher number or a different minimum for its jurisdiction. The rod count is the first check before the column is set.
The design load line is also identical in California. Structural Steel Erection requires: "(B) Each column anchor rod (anchor bolt) assembly, including the column-to-base plate weld and the column foundation, shall be designed to resist a minimum eccentric gravity load of 300 pounds (136.2 kg) located 18 inches (.46m) from the extreme outer face of the column in each direction at the top of the column shaft." according to California Department of Industrial Relations. This is a design specification, not a field test. The crew does not perform a 300-pound load test on site. The engineer or designer confirms this line in the drawings. Keep the page that prints this line with your site records. For the weld in that assembly, see Hot-work handoff: 6 checks before the crew welds.
Washington State Legislature uses the same language for the rod count. WAC 296-155-707 states: "(a) You must anchor all columns by a minimum of 4 anchor rods (anchor bolts)." according to Washington State Legislature. The count is four rods, no fewer. If you are working in Washington, this is the rule that applies to your column.
The repair ban and the written notice to the erector
Before the steel erector stands up a column, the controlling contractor must verify that no anchor rod has been altered without proper authorization. The rules across the federal, California, and Washington pages align on a strict prohibition: anchor rods shall not be repaired, replaced, or field-modified without the approval of the project structural engineer of record, according to Legal Information Institute. This requirement is not a suggestion; it is a hard stop. The same rule appears in the California Code of Regulations, which states that anchor rods shall not be repaired, replaced or field-modified without the approval of the project structural engineer of record, according to California Department of Industrial Relations. Washington State Legislature’s WAC 296-155-707 mirrors this language, stating that you must not repair, replace, or field-modify anchor rods without the approval of the project structural engineer of record, according to Washington State Legislature.
If a repair, replacement, or modification did occur, the controlling contractor has a second duty: providing written notification to the steel erector. The federal page specifies that prior to the erection of a column, the controlling contractor shall provide written notification to the steel erector if there has been any repair, replacement or modification of the anchor rods of that column, according to Legal Information Institute. This notice must be in writing; a verbal heads-up is not sufficient. The California page repeats this obligation, noting that the controlling contractor shall provide written notification to the steel erector if there has been any repair, replacement or modification of the anchor rods of that column, according to California Department of Industrial Relations. Similarly, the Washington page requires that the controlling contractor must provide written notification to the steel erector if there has been any repair, replacement or modification of the anchor rods of that column, according to Washington State Legislature.
A filled reference table of the anchor-rod rules by publisher
The table below lists the specific anchor-rod requirements found on the source pages for each publisher.
| Publisher | Rod Count | Design Line | Repair Approval | Written Notice |
|---|---|---|---|---|
| Legal Information Institute | a minimum of 4 anchor rods | 300 pounds (136.2 kg) located 18 inches (.46m) | project structural engineer of record | written notification to the steel erector |
Illustrative example of a column check
A crew checks a single steel column before it is set. They count 4 anchor rods at the base plate and compare that count with the minimum of 4 anchor rods. The drawing shows the assembly, including the column-to-base plate weld and the column foundation, is designed to resist a minimum eccentric gravity load of 300 pounds located 18 inches from the extreme outer face of the column in each direction at the top of the column shaft. No rod was repaired, replaced, or field-modified, so there is no written notice for the steel erector. The crew writes the rod count and the design check on the site record, then the column can be set.
What to write on today's column check
Record the pre-erection check on your site log before the column is set. Today, count the rods, confirm the drawings, and get any written repair notice before the set.
FAQ about anchor rods before a column is set
How many rods do the pages require?
The federal rule states that all columns shall be anchored by a minimum of 4 anchor rods, according to Legal Information Institute. The California rule repeats this requirement, stating all columns shall be anchored by a minimum of 4 anchor rods, according to California Department of Industrial Relations. Count the rods at the base plate before the column is stood up.
What does the 300-pound line describe?
The 300-pound line describes a design requirement, not a field load test. The rule states each assembly shall be designed to resist a minimum eccentric gravity load of 300 pounds located 18 inches from the extreme outer face of the column, according to Legal Information Institute. The California page specifies the same design load of 300 pounds at 18 inches from the column face, according to California Department of Industrial Relations.
Who must approve a repair?
The project structural engineer of record must approve any repair, replacement, or field modification. The federal rule states anchor rods shall not be repaired, replaced, or field-modified without the approval of the project structural engineer of record, according to Legal Information Institute. Do not proceed with erection if a repair was made without this specific approval.
What notice must the erector receive?
The controlling contractor must provide written notification to the steel erector before erection. The rule states that prior to the erection of a column, the controlling contractor shall provide written notification to the steel erector if there has been any repair, replacement, or modification of the anchor rods, according to Legal Information Institute. If you are the erector, request this written notice before the crane lifts the column.
What should you write down today?
Record the rod count and the status of any repair notice on your site record. Write down the number of anchor rods counted at the base and whether a written notice regarding repairs was received. If a repair occurred, note the date of the written notice.