Abstract
PVC waterproofing sheet is applied in exposed form on the rooftop of building. Most of the PVC waterproofing sheet of exposed type are improved mechanical properties of waterproofing sheet through laminating the patterns of reinforcing fiber. However, existing reinforcing fiber is would be occurred defect of waterproofing layer tear, because it has a anisotropy. The test targets are reinforcing fiber of three types. and the test items are total six items that is specified by KS F 4911. As a result of test, while A-specimen and C-specimen have not the anisotropy, B-specimen has the anisotropy. B-specimen which is applied patterns of reinforcing fiber of I-type, is wide variations in the mechanical properties. C-specimen which is applied patterns of reinforcing fiber of Z-type, is not wide variations in the mechanical properties because it has the anisotropy.