| 摘要 |
An underlayment sheet ( 10, 10 ') is applied in overlapping courses to a roof deck ( 36 ) for establishing a weather-resistant membrane for use as a final exposed surface or below a roof covering ( 50 ). The underlayment sheet ( 10, 10 ') has a bottom surface ( 16, 16 ') to which a pressure sensitive adhesive section ( 22, 22 ') is applied generally continuously along its length. A non-adhesive section ( 24, 24 ') also extends the length of the bottom surface ( 16, 16 ') adjacent its upper long edge ( 18, 18 ') for providing a contact surface with the roof deck ( 36 ) which is devoid of any adhesive material. The non-adhesive section ( 24, 24 ') is attached to the roof deck ( 36 ) using tin tags ( 44, 44 ') or other mechanical fastening components. When subsequent underlayment sheets ( 10, 10 ') are applied in overlapping courses, the adhesive sections ( 22, 22 ') bond over the preceding underlayment sheet ( 10, 10 ') to establish a water tight seal. The top surface ( 14 ) of the underlayment sheet ( 10 ) may include a supplemental bonding strip ( 30 ) which adheres directly to the adhesive section ( 22 ) of an overlying underlayment sheet ( 10 ) to establish a tenacious seal. The top surface ( 14 ') may also be impregnated with a course granular material ( 52 ) to serve as a final, exposed surface for the roof in lieu of shingles or the like. If a future re-roofing operation is required, the subject underlayment system can be removed from the roof deck ( 36 ) without damaging or delaminating the roof deck ( 36 ) material.
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