Nothing that I am aware of for R13, as you mention it would be 2" rigid foam which is approximately R-7 per inch.

How much space do you have? Have you considered Aspen Aerogel?

Ouch expensive! I can see why only used for big budget projects.
Would be great if there was a knock off!
Thanks for the ideas.

I'ld go with a combination of the following ....

first, put up 2" rigid foam insulation on the outer walls (cover the entire wall)....

second, put up 2" rigid foam insulation on the outer walls with 4-inch wide 1-inch deep cutouts for wall stubs ... (easiest to make the cutouts using a jig set for the 16-inch spacing you would typically want, make sure you only cut halfway through the foam boards) ...

third, put up 1x4 boards into the cutout spaces and secure them to the original wall (don't forget to extend your wall outlets through all this insulation so that you still have access to your electrical system!)

finally, install drywall over the interior, seal and paint for a professional appearance. finish up with your new electric panel covers.

Thanks Skye. I'm afraid so much work is out of my league and budget right now.
I'm thinking about putting up just 1" of rigid on the interior wall, capping with t&g, and then ideally one day if I get around to residing the cabin, sticking another 1-2" out there as well.
Not sure if it needs a vapor barrier, or where it would go. But seems doable for me.

It's a cabin in the woods in Canada. I had a few in the Kawarthas. At first, I was worried about insulation. But a woodstove and an inexhaustible supply of fuel quickly dispelled all concerns--except keeping the temp below 95ú F. in the winter.

This post was edited by worthy on Fri, Jul 18, 14 at 14:03

aerotherm insulation ... with this u don't need r30

Applications in the manufacturer's website only include clothing.

Air leakage is more important than R-Value. Make sure you attack the lion before the cub.

tx, what is the best way to block air leakage around closed cavities like when u dont want to make lots of holes to blow thru ur floors and ceilings in between levels plz?