Abstract: Apparatus for installing siding over a wall composed of spaced apart studs and for forming an interlock of the siding and for providing easy installation and for resistance to high winds and for allowing waters to drain therefrom comprising an upside down U-shaped receiving member for being clipped on a first siding plank and connected to a second U-shaped receiving member with the second U-shaped receiving member being faced for receiving a second siding plank for creating the desired over lap relationship between the first and second siding planks. One form of the apparatus has a substantially U-shaped aperture formed therein for avoiding the studs when clipped on a siding plank. Another form of the apparatus has a second up side down U-shaped receiving member for being clipped on factory created end joints which may meet at any location on the wall without regard to the studs to form a joint.