Mastering IECC 2024 Rescheck: A Guide to R408 Additional Efficiency Credits

Navigating the 2024 International Energy Conservation Code (IECC) can feel like a maze, especially when you’re staring at the Additional Efficiency Package Options in a Rescheck report. To meet the new standards, builders must select a specific number of “credits” from Section R408.2.

About the author:

Jobe Leonard Rescheck.info

As the lead consultant at Rescheck.info, Jobe Leonard is a premier expert in Rescheck reporting and energy audit software, including Comcheck and Manual J. Specialized in IECC 2024 energy code compliance, Jobe provides professionals nationwide with essential Rescheck tutorials, DIY guides, and free energy-efficiency resources through the authoritative Reschexpert blog.

Here is a breakdown of the specific options you’ve listed and how they impact a home’s energy performance and your compliance path.

1. R408.2.6: Energy Efficient Appliances

This option focuses on the “plug loads” of the home. To claim this credit, a specific percentage of appliances installed must meet Energy Star or equivalent high-efficiency standards.

• The Goal: Reduce the baseline electricity consumption of the household.

• Common Targets: Dishwashers, refrigerators, and clothes washers/dryers.

• SEO Tip: Homeowners love seeing “Energy Star” because it translates directly to lower utility bills.

2. R408.2.7: On-Site Renewable Energy

If the project includes solar panels (photovoltaic systems) or wind turbines, this is where they shine.

• The Goal: Offset the home’s energy consumption by generating power on-site.

• Rescheck Impact: This provides significant credit, often making it easier to pass the overall energy rating if the building envelope is less than perfect.

3. R408.2.8: Demand Responsive Thermostat

This isn’t just a “smart” thermostat; it’s one that can communicate with the utility grid.

• The Goal: “Load Shifting.” These devices can receive signals from utility providers to slightly adjust temperatures during peak demand periods (with homeowner override capability).

• Benefit: Helps stabilize the local power grid and often qualifies for utility rebates.

4. R408.2.9: Opaque Walls

This option refers to the “hidden” efficiency of your home—the insulation and assembly of your exterior walls.

• The Goal: Improve the U-factor (heat transfer) of the walls beyond the standard prescriptive requirements.

• How it’s done: Usually involves using Continuous Insulation (ci), such as rigid foam board on the exterior, or moving to $2 \times 6$ framing to allow for thicker cavity insulation.

5. R408.2.10: Whole-Home Lighting Control

Moving beyond simple dimmers, this credit requires a centralized system to manage the home’s lighting environment.

• The Goal: Automated energy savings through “scenes,” occupancy sensors, and scheduled shut-offs.

• Key Requirement: The system must be capable of controlling a significant majority of the lighting load in the house.

6. R408.2.11: Higher Efficacy Lighting

While LED bulbs are now the standard, this option pushes the envelope further by requiring lamps with even higher lumens-per-watt ratings.

• The Goal: Minimize the heat and energy wasted by lighting.

• Rescheck Impact: It is one of the more cost-effective ways to gain an extra efficiency point compared to expensive mechanical upgrades.

If you need a Rescheck created using these or any of the Rescheck credits them email pdf plans, jobsite address, and square footage to service@rescheck.info now.