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yêu cầu có lớp phớt trung gian bão hòa làm từ asphalt loại 30 nằm giữa các lớp tấm lợp ván che với độ dốc 6/12 hoặc thấp hơn, khuyến nghị sử dụng đối với độ dốc lớn hơn 6/12.
type 30 asphalt saturated felt interlay is required between courses of shake shingles on slopes of 6/12 or lower, and is recommended for slopes greater than 6/12.
large scale production and refinement of petroleum provided feedstocks for liquid fuels such as gasoline and diesel, solvents, lubricants, asphalt, waxes, and for the production of many of the common materials of the modern world, such as synthetic fibers, plastics, paints, detergents, pharmaceuticals, adhesives and ammonia as fertilizer and for other uses.
large-scale production and refinement of petroleum provided feedstocks for liquid fuels such as gasoline and diesel, solvents, lubricants, asphalt, waxes, and for the production of many of the common materials of the modern world, such as synthetic fibers, plastics, paints, detergents, pharmaceuticals, adhesives and ammonia as fertilizer and for other uses.