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R-Value Calculator
R-Value Calculator
Calculate R-values with Ease for Retrofit Walls
Calculate R-values with Ease for Retrofit Walls
With the Owens Corning R-value Calculator, residential contractors can quickly and accurately determine the total R-value for retrofit wall configurations.
This insulation r-value calculator tool simplifies decision-making by showing how insulation choices, such as foam insulation under siding, contribute to energy savings and comfort. Use our wall r-value calculator to confidently demonstrate the long-term benefits of high-performance insulation and help homeowners make informed decisions.
What to Expect: The R-value Calculator will guide you through selecting stud types, spacing, and insulation options—like XPS Foamular, Mineral Wool, Spray Foam, or Fiberglass—and provide a total wall R-value based on your inputs.
Enter your wall assembly details below including continuous insulation and cavity insulation to calculate your affective Total Wall R-value. This calculation will include the assumed R-values of ½” OSB (0.62) and ½” gypsum (0.45).
Calculating Inputs
Exterior Insulation
Choose to enter an exterior insulation R-value, or choose an XPS Insulation thickness to calculate.
Cavity Insulation
Choose to enter a cavity insulation R-value, or choose an insulation type and thickness to calculate.
Results
| Stud-Wood | 2” x 4” (R-value 3.71) |
| Stud Spacing | 16in. O.C. |
| Exterior Insulation R-Value | -- |
| Cavity Insulation R-Value | -- |
TOTAL WALL R-VALUE
--
This calculation assumes the following:
- Outside air film 0.17
- 1/2" OSB 0.62
- 1/2" gypsum 0.45
- Interior air film 0.68
Why Choose Owens Corning's Wall Insulation R-value Calculator and Products?
Why Choose Owens Corning's Wall Insulation R-value Calculator and Products?
Our wall insulation R-value Calculator makes it easy to compare the performance of different insulation materials, helping you choose the right solution for retrofit projects.
Fiberglass Insulation
A versatile and cost-effective option, fiberglass insulation provides reliable thermal protection across a wide range of R-values and thicknesses for interior walls. It’s a trusted solution for contractors tackling retrofit wall projects that require consistent performance.
Natural Polymers Spray Foam
Spray foam insulation offers superior air sealing, dependable performance, and low VOC emissions. With advanced formulations to maximize sprayability and reduce odors, spray foam delivers excellent energy efficiency and homeowner comfort.
Thermafiber® Mineral Wool Insulation
Mineral Wool insulation provides outstanding thermal performance and durability, with the added benefit of being fire-resistant. It’s a dependable solution for creating energy-efficient wall assemblies.
Foamular® NGX® XPS
This extruded polystyrene foam insulation offers superior durability and long-term thermal performance, retaining 90% of its R-value even after 20 years. Foamular is a reliable choice for energy-efficient exterior walls where consistent insulation performance is critical.
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Find Insulation Contractors
Find Insulation Contractors
Looking for insulation contractors? Find a certified insulation installer near you to help you achieve the R-value results you are looking for in your retrofit wall project.