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409 Coeur D Alene Ave B. Coeur d'Alene, ID 83814
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If you’re considering spray foam insulation for your home in Kootenai County, you’re making a great choice for energy efficiency and comfort—especially given the region’s cold winters. But how many inches of spray foam do you actually need? The answer depends on local climate conditions, building codes, and the type of spray foam you choose.
In this guide, we’ll break down the recommended thickness of open-cell and closed-cell spray foam for different areas of your home.
Understanding R-Value Requirements for Kootenai County
The R-value of insulation measures how well it resists heat flow. The higher the R-value, the better it performs.
Recommended R-Values by Building Codes (IECC Climate Zone 6)
Kootenai County falls within Climate Zone 6, which has stricter insulation requirements due to its cold winters. The minimum recommended R-values for insulation are:
Now, let’s calculate how much spray foam is needed to meet these requirements.
How Many Inches of Spray Foam Do You Need?
Spray foam insulation comes in two main types, each with different R-values per inch:
Spray Foam Type R-Value per Inch Best For Open-Cell FoamR-3.5 to R-4Interior walls, soundproofing Closed-Cell Foam R-6 to R-7 Exterior walls, attics, basements, high-moisture areas
1. Attic Insulation (Recommended R-49 to R-60)
🔹 Best Option: Many homeowners use open-cell spray foam in the attic because it’s more cost-effective and expands well to fill gaps. However, closed-cell foam is better for roofs with moisture concerns or limited space.
2. Exterior Wall Insulation (Recommended R-20 to R-25)
🔹 Best Option: Closed-cell spray foam is ideal for exterior walls because it provides a high R-value and acts as a vapor barrier, preventing moisture from entering the home.
3. Basement & Crawl Space Insulation (Recommended R-10 to R-19)
🔹 Best Option: Closed-cell spray foam is best for basements and crawl spaces since it resists moisture, prevents mold, and strengthens structural integrity.
4. Floors Over Unheated Spaces (Recommended R-30)
🔹 Best Option: Closed-cell spray foam is recommended because it offers better support and protection against cold air infiltration from below.
Key Takeaways: What’s Best for Kootenai County Homes?
💡 Tip: Always check with local building codes and consider hiring a professional insulation contractor for accurate application and thickness.
Need Help with Your Insulation Project?
If you’re unsure how much spray foam your home needs, a local insulation expert can assess your space and recommend the best approach. Reach out to an insulation professional in Kootenai County today!
Would you like recommendations for local spray foam installers? Let me know! 🔧
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