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<br />Epoxy coatings <br /> <br />37. Two epoxy coatings (coatings 9 and 10) were used to seal the brick- <br /> <br /> <br />veneer walls. One epoxy coating was 100 percent solids. In each case, the <br /> <br /> <br />wall with the epoxy coatings leaked excessively. <br /> <br /> <br />Polyurethane coatings <br /> <br />38. Polyurethane coatings were not effective in keeping the wall from <br /> <br /> <br />leaking. If moisture collected between the polyurethane and the wall, the <br /> <br /> <br />coating turned a milky color. After about a year of exposure to the elements, <br /> <br /> <br />the polyurethane coating began to crack and peel off the wall. <br /> <br /> <br />Asphalt coatings <br /> <br />39. Asphalt coatings were not effective unless excellent workmanship <br /> <br /> <br />was used and even then there were possibilities of leakage. An asphalt coat- <br /> <br /> <br />ing is adequate if an impermeable barrier such as roofing felt or sheet poly- <br /> <br /> <br />ethylene is embedded in the coating. Good workmanship and correct application <br /> <br /> <br />techniques must be used even when the impermeable barrier is used, or leaks <br /> <br /> <br />may develop. <br /> <br />14 <br />