Abstract: A flexible flashing device for vertically stacked, building siding panels having a resiliantly deformable spacing means for accommodating the structural expansion and contraction of the underlying framework of a building. The flexible flashing device incorporates a waterproof flashing member for preventing the intrusion of water into abutting ends of vertically stacked, building siding panels. Additionally, a method of preventing contraction buckling of vertically stacked, building siding panels caused by improper installation is provided whereby the flexible flashing device is inserted between the abutting ends of two vertically stacked panels.

Abstract: An apparatus for driving nails having an electrical power unit removably connected to a nail holding cartridge is disclosed. The power unit has an electric motor which drives a geared cylinder or drum. Gears on the drum intermesh with an elongated driven member having a nail engaging portion on one end thereof and being controlled in its longitudinal movement ultimately by the movment of the motor and directly by the geared drum. A barrel attached to the nail cartridge is adapted to receive nails, one at a time, from an automatic nail feeding mechanism also located in the nail cartridge. A nail holding mechanism disposed within the barrel insures that the nail is held straight throughout the nail driving operation. A nail countersinking attachment is provided for countersinking nails a predetermined distance into a nail driving material. Also, an extension attachment is provided to allow nails to be driven less than completely into a nail driving material by a predetermined amount.