Yes, there could be several reasons to also install a ground rod even if a Ufer ground (concrete-encased electrode, CEE) is required by the IRC. Here's a breakdown of the reasoning

Reasons to Install a Ground Rod in Addition to a Ufer Ground:
Enhanced System Redundancy

A ground rod provides a redundant grounding path. If the Ufer ground were to somehow be compromised (damage to the concrete, corrosion, etc.), the ground rod would still provide a path to ground.

Compliance with Specific Local Amendments or Jurisdictional Requirements

While the IRC might require a Ufer, a local jurisdiction or inspector may also require a ground rod or a specific grounding electrode system. Always check local codes.

Better Performance in Specific Soil Conditions

A Ufer ground relies on the concrete being in contact with the earth and providing a stable, low-impedance ground. If the soil surrounding the foundation is particularly poor (high resistivity, sandy, rocky), a ground rod (especially driven deep) can improve the overall grounding system performance. The Ufer is great, but its performance can still be soil-dependent.

Future Considerations/Expansion

Even if not required at the time of construction, adding a ground rod could be a proactive measure for future electrical upgrades or additions to the property. It could simplify future grounding requirements for things like generators, outbuildings, or solar panels.

Potential for Lightning Protection Systems (LPS)

Although a Ufer ground can contribute to a grounding system for lightning protection, a dedicated grounding electrode system is usually required for a full LPS. Ground rods are a common component of these systems. While not directly related to the NEC or IRC's basic grounding, it's something to consider if the homeowner is thinking about LPS in the future.

Peace of Mind

Some electricians or homeowners simply prefer the added security and perceived safety of having multiple grounding electrodes.

IRC Requirements and Considerations

The IRC (International Residential Code) typically requires a grounding electrode system that includes at least one of the following (among others): A metal underground water pipe in direct contact with the earth for 10 feet or more. A concrete-encased electrode (Ufer ground) consisting of at least 20 feet of bare copper conductor encased within at least 2 inches of concrete. A ground ring encircling the building. Rod and pipe electrodes

Supplementation is Permitted

The IRC generally permits the use of supplemental grounding electrodes, even when one of the primary electrodes (like a Ufer) is already in place.

NEC Implications

The IRC references the NEC (National Electrical Code) for many electrical requirements. The NEC provides more detailed specifications for grounding and bonding.

Important Notes



Bonding is Crucial

Regardless of the number of grounding electrodes, it's essential to properly bond all electrodes together using appropriate bonding conductors. This ensures that all grounding points are at the same potential.

Consult a Qualified Electrician

The best course of action is to consult with a licensed and experienced electrician. They can assess the specific site conditions, local codes, and the homeowner's needs to determine the most appropriate and compliant grounding system.

Don't Rely on Assumed Grounding

Never assume that metal objects like gas pipes, rebar (without proper connection as a Ufer), or metal building structures provide adequate grounding. These must be properly evaluated and bonded if they are to be part of the grounding system.

In summary: While a Ufer ground might satisfy the minimum IRC requirement, adding a ground rod can offer several benefits in terms of redundancy, performance, future-proofing, and potentially meeting stricter local codes. Always consult with a qualified electrician to determine the optimal grounding system for your specific situation. Flag for review