has anyone heard of this product? They make varoius thicknesses of epanded poly insulation with mylar radiant skins. Is it any better than any other radiant blocking insulation product?

Does radiant blocking in general do what it is claimed to do?

Have seen demo with radiant barrier, and several of the related products. No opinion as of yet, but am thinking of putting it under the foundation and slab of the house we're building. There are several products which are quite similar.
Kactus Kid

Depends on what is claimed. Some claims are pure bogus, others are valid. How are you looking to use the product? If you want the benefits of the radiant coating it must face an air space. That's why it'll work in an attic but not under a slab.

Recent studies are proving that under-slab reflectives are useless. (no air space) We have been sold on them for years and have always questioned there validity. We actually have sold them for years due to the mechanical contractors requesting this product for ease of use. We will no longer sell it for under-slab in the near future.

Dave

they make some pretty bold claims, they no longer claim actual R-values on thier website anymore, though they hint that 5/8" performs better than R20. i put 1 1/2" of Dow Thermax poly isocyuranate board, the R-values are printed right on the boards, 1" = R6.5, with a 3/4" air gap R9.3. it has a shiny foil like skin on both sides.

I know it’s a bit old but I would like to know if I could clarify a few misunderstandings with P2000?

P2000's reflective laminate is not foil, foil conducts heat and requires an air space. P2000 has a metallized plastic laminate. (metallized boPET) Metallized plastic is most commonly referred to as “Mylar.” Mylar is a registered and trademarked name under the DuPont corporation. (Think what Kleenex is to tissue) Metallized boPET is used in NASA’s space suits to shield from radiation and insulate the astronauts, emergency blankets to conserve a shock victim's body heat, and fully body suits for aircraft rescue and firefighting applications. (these are the same suits you see volcanologists wearing while standing next to molten lava)
The 2nd law of thermodynamics is heat flows from hot to cold. P2000 has the metallized laminate on both sides, so during the summer it will keep the home cool by reflecting the outside heat away, and warm in the winter by reflecting the heat back inside.
“Thermax” (Dow) it has an R-value of 6.5 at 1”. There’s another similar product to that called Thermasheath by R-max which has an R-value of 5.9. Both are a foil-faced polyisocynaurate foam which will off-gas an eventually obtain a lower “aged R-value.” P2000 at a 1” thickness has an R-value of 10.3 this is per the ASTM C1363-05, “Guarded Hot Box” test. Warnock Hersey/Innertek Testing evaluated P2000 and found that the effective R-value for 1” was over 27. P2000 uses electricity to expand the polystyrene beads from 1” to 3”. This is where all of the competitors stop; P2000 takes the 3” expanded board and uses huge steam rollers to compress the 3” back down to 1”. This is why you’re able to bend a 1” thick board into a 90 degree angle and not have it snap. P2000 also is able to provide a 20 year warranty for consistent energy savings. (no aged r-value)
You’ll find that the most current study performed for California Energy Commission demonstrated that Framing Factor for residential walls is close to 27%. So…the actual R-value for 2x4 wall insulated with R-2.3 (R-13) fiberglass batts (nominal R-value of R-2.6 m2W/K –(R-14.5)) is in the range between R- 1.5 to 1.6 m2W/K (R-8.5-9.0 hft2F/BTU). This is 35 – 40% reduction of nominal wall R-value.
Here’s a summary of tests, certifications, and thermal images for P2000: http://www.p2insulation.com/index.cfm?pageid=6

~Brian