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EPS Facts Regarding <br /> Below-Grade Applications <br /> BELOW—GRADEJ . <br /> Recently a report was presented from Huntingdon Moisture Content <br /> Laboratories with the results of a moisture content Sample Specimen %by Volume <br /> analysis conducted on several samples of expanded •3 Year"(EPs) 1 (Bottom) 2.1 <br /> and extruded polystyrene. (exposed approx. 2(Top) 1.5 <br /> 3 years) 3(Bottom) 5.0 <br /> EPS: Observed to be a 2"nominal thickness sub- 4(Bottom) 4.2 <br /> ( 5(Top) 2.0 <br /> mitted to the laboratory on September 20, Average 3.0 <br /> 1991 and August 3, 1993). std.Deviation 1.5 <br /> XPS: Observed to be a 2"nominal thickness(sub- <br /> mitted to the laboratory in May of 1993). <br /> Moisture Content <br /> Sample Specimen %by Volume <br /> "I Year" (EPS) 1 (Bottom) 3.9 <br /> (exposed approx. 2(Top) 6.1 <br /> The "3 Year" EPS sample was applied to the be- 1 year) 3 (Top) 3.6 <br /> low-grade foundation of Huntingdon/Twin City 4(Top) 2.3 <br /> 5(Bottom) 6.5 <br /> Testing's Cromwell Avenue Building on Septem- 5(Top) 7.5 <br /> ber 25, 1991. In May of 1993, the XPS sample Average 5.0 <br /> was applied to the foundation adjacent to the EPS. Std.Deviation 2.0 <br /> The"1 year"EPS sample was applied to the same <br /> foundation on August 10, 1993. <br /> The air temperature on the inside of this founda- Moisture Content <br /> tion wall was maintained at 70+5 F. The samples Sample Specimen %by Volume <br /> were combined in an area 4'wide by 8' deep. The Extruded(XPS) 1 (Top) 7.2 <br /> top of the samples were placed just below ground (exposed approx. 2(Top) 11.5 <br /> level and the samples were held in place by back 15 months) 3(Bottom) 17.2 <br /> 4(Bottom) 18.2 <br /> fill. Average 13.5 <br /> Std.Deviation 5.1 <br /> The samples were removed from the foundation <br /> on August 24, 1994. Approximately five speci- <br /> mens from each sample were removed from vari- <br /> ous depths, for moisture content analysis. _. <br /> Moisture content was determined by weighing the Styrotech Incorporated <br /> specimens after removal, then oven drying at 122 8800 Wyoming Avenue North <br /> Brooklyn Park,Minnesota 55445 <br /> F reweighing and calculating %by volume. Telephone(612)425-4001 Fax (612)425-8994 <br />