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A relatively new Graphite Polystyrene (GPS) rigid insulation is now available from a number of manufacturers. The graphite allows the insulation to be thinner while exhibiting comparable R-value to thicker expanded polystyrene (EPS) boards, and it enhances the material’s R-value as temperatures decrease so it retains more of its R-value in colder temperatures.

Depending on the insulation thickness and density, GPS has a permeability rating ranging from 2.5 to 5.5, which allows for movement of water vapor out of the wall assembly. It also dries quickly and has minimal long-term moisture retention. These two attributes make GPS insulation well-suited for high-moisture environments.

Thanks to Walls and Ceilings Magazine.  Click below to read the full article.

http://www.wconline.com/articles/89887-using-graphite-polystyrene-gps-insulation

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