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  1. Insulation R-Value Chart: R-Values Per Inch (For 51 Materials)

  2. All About Insulation R-Values - The Home Depot

  3. What R-value Do I Need? - Johns Manville

    Typical recommendations for exterior walls are R-13 to R-23, while R-30, R-38 and R-49 are common for ceilings and attic spaces. Use the JM insulation calculator to determine the recommended R-value for your project, as well as …

  4. Insulation R-Values Chart and Buyer Guide - Green …

    2020年8月10日 · Learn how to choose the best insulation for your home based on R-value, cost, performance, and sustainability. Compare spray foam, cellulose, fiberglass, mineral wool, and rigid foam products and see their …

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  6. What Is Insulation R-Value? (+ Insulation R-Value …

    We will look into what does R-value means, how it is calculated, what are the minimum recommended values of R for attics, 2×4 and 2×6 walls, and so on (you will find a complete insulation R-value chart further on), and what it’s so …

  7. Rigid Insulation R-Value Per Inch: A Comprehensive …

    2023年11月17日 · The R value rigid insulation numbers show that rigid insulation performs better than other insulation types in most cases. Polyiso is the top rigid insulation performer at R-6 per inch and closed-cell spray foam …

  8. Rigid Insulation R-Value Per Inch (+ EPS, XPS, ISO …

    R-values for rigid insulation vary from R-3.85 to R-6.8 per inch of thickness. Polyiso has the highest R-value, followed by XPS and EPS. The key to all rigid insulation high R-values are small air pockets that exhibit high thermal …

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