Products / ASTM Organic Mineral Surface Tile Underlayment

Tarco's ASTM Organic Mineral Surface Tile Underlayment is an organic mat impregnated with asphalt saturant, coated with weathering-grade asphalt and surfaced with mineral granules, designed as an underlayment under slate and tile roofs. The product sheet states it meets ASTM D6380 Class M Type II and prints dark-green 36-inch by 36-foot rolls covering one square (108 sq ft) at about 83 lb per roll. It is warranted to be free from manufacturer's defects, with no term printed.