Here is the spec sheet for the "150" XPS. They also have a 250 XPS which I'm not sure what the difference is (perhaps tongue and groove vs flat sides).
http://insulation.owenscorning.com/a...a29e2fd5bc.pdf
With a 40°F temperature differential this stuff has an r-value of 5.5. At 75F differential it is R5.
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