Slide one board to the side, and using the red glue, (I mean, red line indicates glue), glue them together, like this.
After the glue dries, we can then cut the boards along the green lines, and we now have a board that is 36" long.
No, the wood grain, does not run 100% straight up and down, but it this isn't in a structural use, it doesn't really matter.
Therefore, I end up with a 36" long board, that is now about 2 1/2" wide, like this.
This can be either edge joined, or use a tongue and groove joint, pocket hole joined, along with glue, if you want some mechanical fastener along with the glue.
Depending on whether you are going to stain or paint this, the grain may not be visible.
Anyway, just another trick to use in certain situations, hopefully not many.
