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PROJECT NO: 41�10 92-2757 DATE• July 23, 1993 PAGE: 7 C0�ICLUSIO�IS: Based on the test results and observations summarized in this report, the following conclusions can be made regarding the performance of the EPS samples in the study: The amount of water absorbed in the samples at the times of removal was less than 3 % (by volume). The 3 year moiswre content averages were 1.18% for Type I and 1.01% for Type II. The EPS insulation absorbed limited moisture; however it's thermal performance remained within 90% of the original installed R-value. A statistical analysis on the individual R-value data for Type I material suggests that the differences observed between the averages over the 3 yeazs are no[ statistically significant at a 95% confidence level. Some of the differences in the Type II material results are considered statistically significant. These differences are detected primarily due to the fact that there is less variability between specimens in this data set than in the Type I data set. See Appendix D for the analysis of variance results. The thermal performance (R-Value) after 3 years was at least 90% of the original tested values. Therefore, the absorption of moisture had a limited effect on the thermal performance of EPS in this exterior foundation application. '�. _ _ _ No significant physical degradation was evident in the samples throughout the three year exposure. Therefore, the limited moisture absorption and any freeze-thaw that may have occurred had limited effect on the thermal performance of the material, and did not cause any significant swelling, cracking, deformation or other visible degradation of the material. REMARKS: ; The test samples will be reta.ined for ninety days from the date of this report, then discarded unless otherwise notified. ALK\Thermal\92-2757.R2 ; 4S A LIUTUAI PROTECTION TO CUENTS.TME�UBUC ANO OVRSELVES.ALL i'NiN CITV iESTiNG CORPORA710N REPORTS AFE SUBMIiTED AS THE CONfiOENiIAL aROPEr-�iY Qr'�",:�V ij ar�0 AUTMOAiZATION FOR PUBUCATiON OF STA7E��ENTS.CONCLUSIONS OR�XTRACTIQVS FROM OR PEGAR0ING OUR REPORTS IS RESERVED P�NDING OUA PRIOR'NRlii�y 4?oapy,y�