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I need every inch of height on my basement ceiling, so I was wondering if either 1 or 2 layers of roofing type polyiso HD cover board would work as both the insulation and sub-tile floor? A couple of companies make such cover board and both claim an R value of 2.5 for only 1/2" thickness. All input is appreciated.
Links:
[1] http://pubads.g.doubleclick.net/gampad/jump?iu=/6134/ttn.gba//print&t=window&sz=275x60;&c=116472576
[2] http://www.greenbuildingadvisor.com/qa-category/energy-efficiency-and-durability