Homeowners, contractors and building professionals should use only roofing materials that meet the standards of the National Roofing Contractors of America or the American Society for Testing and Materials, says Syed Abdallah Rizvi, president of Bitumat International Roofing in Saudi Arabia. "Building consultants and contractors worthy of their profession must apply the ASTM and NRCA standards and not cut corners by reducing the cost by using substandard materials," Rizvi said.

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Saudi Gazette

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