No wood below window to include a Window Stool
I have an add on room that wasn't built correctly. I installed new windows but the bottom of the windows lines up with the 2x4's below. There is no wood or anything sticking out to allow me to nail in a window stool. To make matters worse the 2x4 below the window was originally a 2x6 and was then cut down unevenly to something like a 2x4. Since the surface isn't level I can't even nail on top of it another 2x4. Any suggestions? Better just not to do a spool? Thanks.