Total R-Value of R-19 + R-11 Attic Insulation (R-30)

Combining R-19 and R-11 batts in an attic, plus sheathing and drywall, yields approximately R-30.9 total assembly R-value.

Embed this tool on your site

<iframe src="https://abracalc.com/calculator/insulation-r-value/r30-attic-two-layers/embed.html" width="340" height="320" style="border:1px solid #e4e7ec;border-radius:12px" loading="lazy"></iframe>

How to use this tool

Enter the R-value for each insulation layer (set unused layers to 0).
Include sheathing and drywall R-values for a complete assembly calculation.
The result shows total R-value and U-factor for the wall or ceiling assembly.

Calculate the combined R-value of an attic insulated with a base layer of R-19 and a cross-layer of R-11 batts.

Frequently asked questions

What does R-value mean?: R-value measures thermal resistance — how well an insulation layer resists heat flow. Higher R-values mean better insulation. Values are additive when layers are stacked.
What is U-factor?: U-factor (or U-value) is the inverse of total R-value (U = 1/R). It measures heat transfer rate — a lower U-factor means better insulating performance.