| 摘要 |
The present invention provides a composite sheet material (10) that is particularly useful as an underlayment material in roofing applications. In particular, the present invention provides a composite sheet material (10) that is flexible, relatively lightweight, resistant to water as well as being water vapor permeable and resistant to tearing. In addition, the composite sheet material (10) includes an outer non-skid surface (18) that can help prevent slippage of workers during installation of the roofing system. Embodiments of the composite sheet material can help provide a roofing/structure, such as a shingled roof, with fire resistance so that the roof can meet the Fire Resistance requirements of ASTM E 108-07a, Class A. |
