In one aspect, a wall panel is provided that includes a cross laminated timber panel, a first extrusion, and a second extrusion. The cross laminated timber panel includes a top side, a bottom side, a first side, and a second side. The panel also includes a notch in the bottom side and a T-flange on the top side. A wall system is provided comprising a plurality of wall panels. A method of installing the wall panel system is also provided.