I would like to put in some shelves similar to what is in this youtube video in a hallway closet. The length of each shelf is around 42".
I planned on using the 2x2s for support per the video. The only problem is that the back wall where the longer 2x2 would be supporting the shelf has no studs. The drywall is directly against the cinderblock firewall between my unit and my neighbor's (I live in a condo). I assume it is attached via construction adhesive because that is what was in my half bath as well.
My question - could I just screw the back 2x2 at each end to the studs in the side walls of the closet and maybe throw some construction adhesive between the 2x2 and the drywall for added support?
The side supports will be screwed into studs at each end and are approximately 12" in length.
Any advice is appreciated.