A sheet material support device that is attachable to studs, joist, beams or other suitable framing components and that facilitates mounting orthogonal junctions of sheet material pieces without need of multiple studs is described. The device includes a fastener-receiving member used to fasten the sheet material to the device and a stud-mounting member orthogonally transecting the fastener-receiving member that is used for mounting the device on the stud. The sheet material support device is made of a pliable plastic material and can be quickly mounted to the studs through the stud-mounting member using an ordinary construction grade staples. Each of two orthogonally oriented sheet materials forming the junction are quickly mounted by being fastened through the stud-mounting member into the stud in one case and into the fastener-receiving member in the other case.