| 摘要 |
PROBLEM TO BE SOLVED: To provide a roof underlayment having an autohesive layer, which enhances the advantages and nearly perfectly overcomes the disadvantages of current roof underlayments having a core of either synthetic resin non-woven fabric or asphalt-impregnated base paper. SOLUTION: A roof underlayment is characterized in that at least one of asphalt layers 3 laminated on both faces of an asphalt-impregnated base paper 2 is a composite layer of an asphalt layer and a non-woven fabric layer 4, and that a mineral powder layer 5 is formed on the front face of the asphalt layer 3 and an autohesive layer 6 is formed on the rear face of the asphalt layer 3. Thus, the pinholes in the core can be perfectly occluded in spite that the core is asphalt-impregnated base paper. The resisting strength against tearing is also increased.
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