R-value by panel thickness

It's an R8 per inch, and this two inch panel is an R16. If you went to a three inch, you'd be R24, four inch 32, five inch R40, and this could go all the way up to eight inch. Typically, when you get into the heavier gauge or heavier, bigger core thicknesses of four inch, you're typically into the coolers. You're into 35 degree to minus 20 degree freezers. And then if you get into something lower than minus 20, you'd go into a five inch panel, and much lower than minus 30, 40, you'd want to get into a six inch panel.