| 摘要 |
<p>A roof jack (10) with a planar portion (15) a frusto conical upstanding portion (16), a transition region (20) and a stepped sealing portion (21). The roof jack is unitary of vacuum formed polymeric sheet material. The planar portion (15) lies on the roof surface and is sealed thereto. The frusto conical portion (16) is elevated above the roof surface and ends at the transitional portion which is corrugated to allow bending to conform to the pitch angle of the roof without distorting any of the other portions. A stepped roof jack (50) for flat roofs is disclosed with a protective cap (53). The roof jack (50) includes a runoff (56). Another embodiment the planar portion (101) includes longitudinal corrugations (102) to provide preferred bending to allow it to conform to shaped roofs such as spanish tiles. A bendable stiffener member (115) allows the planar portion to be bent and retain a selected shape.</p> |
