Abstract: A mounting system for a roof-mounted structure comprises: a roof having a surface; a shaft having a first end opposing a second end, and including a roof fastening portion at the first end and secured within the roof, an anchor portion for securing the roof-mounted structure at the second end, a drive part and a radially projecting shoulder surface oriented toward the roof fastening portion; and a washer positioned on the surface of the roof and disposed on the shaft such that the shoulder surface urges the washer into watertight sealing contact with the surface of the roof.

Abstract: An apparatus for securing a roof-mounted structure to a roof is disclosed. The apparatus comprises: a shaft extending along a longitudinal shaft axis and including a first end opposing a second end; the first end including a roof fastening portion; the second end including a drive part and an anchor portion for securing the roof-mounted structure to the shaft; and the shaft including a radially projecting shoulder surface disposed between the first and second ends and oriented toward the first end.