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2021 IECC

Stay Ahead with the 2021 IECC: What Homeowners & Builders in Lake and McHenry Counties Need to Know 

The building industry continues to evolve to meet modern energy standards and environmental goals. One of the most impactful changes in recent years is the adoption of the 2021 International Energy Conservation Code (IECC). These updated regulations introduce stricter insulation and air sealing requirements for both residential and commercial construction—and if you’re a homeowner or builder in Lake or McHenry County, understanding these updates is crucial for code compliance, energy savings, and overall building performance.

What Is the 2021 IECC?

The IECC establishes minimum energy efficiency standards for new construction, renovations, and additions to existing structures. The 2021 edition—which is being adopted across the U.S.—emphasizes better building envelopes, reduced energy consumption, and a more sustainable built environment.

Key Changes in the 2021 IECC 

⬆️ Higher R-Value Requirements 

Thermal resistance (R-value) standards have been raised, particularly in Climate Zone 5, which includes Lake and McHenry Counties. This means thicker insulation is now required in walls, attics, and floors to improve energy efficiency and reduce heat loss. 

🔒 Enhanced Air Sealing 

The new code puts more pressure on builders to properly seal all penetrations in the building envelope. Drafts around windows, doors, and plumbing or electrical intrusions must be eliminated. Paragon Insulation provides professional air sealing services that meet or exceed these stricter standards. 

📦 Duct Insulation & Sealing 

Ductwork in unconditioned areas must now be both sealed and insulated. Properly done, this reduces heat loss and improves the performance of your HVAC system—saving you money and improving comfort. 

🧱 Continuous Insulation for Exterior Walls 

Continuous insulation is now a requirement for many wall assemblies. This helps prevent thermal bridging and improves the overall efficiency of your building envelope. Paragon Insulation uses state-of-the-art materials to deliver code-compliant continuous insulation systems. 

🪟 Tighter Standards for Windows and Doors 

Updated U-factor requirements mean that homeowners and contractors need to choose more energy-efficient windows and doors. Whether you're replacing a few windows or installing brand-new ones, it's important to choose products that meet these upgraded specs. 

Why It Matters for Lake & McHenry County Homeowners

While adapting to these new codes may feel like a challenge, the long-term benefits are well worth it: 

  • Lower energy bills
  • A more comfortable indoor environment 
  • Improved indoor air quality 
  • Fewer drafts and hot/cold spots 
  • Compliance with local building regulations 

Failing to meet IECC requirements can result in costly delays, failed inspections, or rework during your project. Staying proactive ensures smoother construction and better long-term performance. 

How Paragon Insulation Can Help 

At Paragon Insulation, we’re dedicated to helping homeowners and builders throughout Lake and McHenry Counties meet the demands of the 2021 IECC. 

Whether you're working on a new build, renovation, or just need an insulation upgrade, our team of certified professionals can provide: 

  • Full insulation system design and installation 
  • Air sealing and energy code compliance services 
  • Expert consultation on how new IECC updates affect your specific project 

We stay current with code changes so you don’t have to—and we’re here to make sure your structure is comfortable, compliant, and energy efficient. 

Ready to Upgrade or Start a Project?

Let Paragon Insulation take the guesswork out of your next insulation job. 

📞 Call us today at [815-526-3355] or [contact us through our website] to schedule your free consultation. 

Paragon Insulation – Protecting What Matters Most.

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