Join Date: Feb 2010
Location: Whittier, CA. USA
I have to agree with the others. The way you have the joint drawn does not look like it will hold over time with the weight of books. The 1x3 as drawn does not add much to the strength of the joint. If it is the look your wife wants just change the orientation of your parts. Make the dado the same but run the shelf all the way thru. Then rip your 1x3 to fill in the remainder of the dado on top of the shelf. This way your shelf is fully supported by the dado & you still show the 1x3 on top for the vertical edge around the border of plywood.
Just because you can, doesn't always mean you should!