Cabinet Assembly with Prefinished Plywood
I'm building maple face frame cabinets with prefinished 3/4" plywood boxes. For the wall cabinets, the sides, top, and bottom are tongue and grooved into the face frame and will be glued. The sides have dados that the tops and bottoms fit into and will also be glued. The upper rear rail is tongue and grooved into the top and sides and will be glued. The bottom rear rail will attach the same way.
I have the first cabinet dry assembled and am happy with the way all of the components fit together. The question I have is whether glue alone is sufficient or if mechanical fasteners are also needed. The concern is movement in the dado joints with changes in temperature and humidity over time. Could the wood glue (Titebond) in those dado joints crack and the joints loosen as the prefinished plywood moves with seasonal humidity changes? With the prefinished ply, the only bonding surface is the edge of bottoms and the tops into the bottom of each dado. The dados are 3/8" deep.
Do I need to also screw or nail through the sides into the edges of the tops and bottoms? I originally was thinking the wood glue would be a permanent bond but now I'm second guessing this.