Most building professionals want to know how EPS Cement Sandwich Wall Panel performs after decades of real world use, and independent field surveys of 20 year old buildings using this material provide very reassuring results. Researchers inspected 37 different residential and commercial buildings across 6 different climate zones that installed EPS Cement Sandwich Wall Panel back in the early 2000s, to check for any signs of performance degradation. More than 96 percent of all the inspected EPS Cement Sandwich Wall Panel pieces still maintained their original structural integrity, with no signs of warping, delamination or core material degradation. The measured thermal insulation performance of the 20 year old EPS Cement Sandwich Wall Panel only dropped by less than 3 percent compared to its original factory test value, a far better result than most traditional insulation materials. Even in areas with high annual rainfall and high humidity, the EPS Cement Sandwich Wall Panel showed no signs of internal mold growth or moisture damage. This 20 year field survey data proves that the service life of a properly installed EPS Cement Sandwich Wall Panel can easily exceed the 70 year design life that manufacturers claim.