Thermal Resistance Calculator

INSULATION v1.0

Total R = insulation R + other layer R + interior air film (ASHRAE typical R-0.68) + exterior air film (R-0.17). U-value = 1 / total R.

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Results

Total Assembly R-Value
15.85 R
U-Value:0.063 Btu/hr·ft²·°F

Total R = insulation R + other layer R + interior air film (ASHRAE typical R-0.68) + exterior air film (R-0.17). U-value = 1 / total R.

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Trin-for-trin-guide

1

Enter Layer R-Values

Input the insulation R-value and any additional sheathing/other layer R-values.

2

Include Air Films

Keep the ASHRAE-typical interior (R-0.68) and exterior (R-0.17) air film defaults, or adjust for your conditions.

3

Get U-Value

View total assembly R-value and its reciprocal U-value.

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Ofte stillede spørgsmål (10)

Almindelige spørgsmål og svar om dette værktøj.

Still air layers on both interior and exterior surfaces provide measurable insulating resistance — ASHRAE typical values are R-0.68 (interior) and R-0.17 (exterior).
U-value is the reciprocal of total R-value (U = 1/R) and measures heat transfer rate — lower U-values indicate better insulated assemblies.
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Nuværende version: v1.0
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