Another Insulation Question- PolyPlank

[midwest farms]

Is anyone familiar with PolyPlank foam? This is a closed cell polyethylene foam. I am able to source 2" factory seconds at a pricepoint that is a 80% less than I could buy the blue or pink EPS for. The sheets are 4x9 which matches the pole spacing of my pole barn. I would be using in the walls and ceiling-with blow in on top of the foam board. It does not require structural integrity and fire is not a concern as the walls/ceiling will be covered with sheet metal. All seams would be foamed. (My original intent was to use Poly Iso but the local Dow Plant closed and the readily available stream of factory Poly Iso seconds has dried up. Plus the 4x9 sheets will eliminate a lot of cutting and fitting versus the 4x8 sheets. And yes I agree that spray foam would be the "best" option but with the local quotes I've received, the pricepoint is beyond where I can be for this project)

While the price point and size is perfect, I'm unsure how this will perform. The polyplank is not ridgid like EPS but has flex (think pool noodle like composition but with a tighter, less flexible grain pattern). A few questions:

-Any knowledge on the range of r value for this stuff. An internet search provided little guidance. This is the biggest concern.
-Does polyplank shrink over time-will it pull away from the foamed joints?

I know this is a strech as this may not be a common application. Any other guidance would be appreciated. This is the last step before finishing up the wiring and hanging the interior steel. This cold snap has motivated me to get this done!

Thanks!
Midwest Farms

 

[midwest farms]

As an aside, I'm targeting an R value of r12 minimum in the walls and r30 in the ceiling.

 

[dmaxdude]

To Midwest Farms:
I had a source for this foam a few years back. I remember that it was 4X9 sheets of Polyplank foam. I still have my contacts name (Melvin). I spoke to him on his cell phone a couple of months ago to confirm that he still sells this foam. Now that i am ready to purchase i cannot reach him. i am curious that by chance this may be the same source you have. I so do you have any other information to help me inquire/purchase this foam. All I remember is that they were 4x9 Polyplank sheets and the product was located in Indiana. I remember driving through Peru IN to get there so it was in the vicinity of Peru. Also did you find and further info on the R value of this stuff? I also plan on using this in my pole barn project. Thanks dmaxdude