Abstract
This paper discusses a design error case in a building project in Nepal, where the designer made the wrong assumptions in roof treatment work for waterproofing as well as for heat insulation purposes. Due to the design error, the project had faced profound roof leakage problems over 6000 sq. meters building area. The worst case was that the instructors and the students had to conduct training programs under the leaking roofs. Water proofing polymer not applied directly over concrete slab top and use of heavy concrete block as a heat insulation material were found to be the technical causes of roof leakage. However, carelessness from designer and supervisors also was profound for the leakage. The paper concludes with the lessons to be learned from the problem.
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