I am using clear tongue and groove fir for flooring on a porch. It will overhang the porch frame about 3/4 inch. My original thought was to cut it off straight after installation then use a router to put on a bull nose edge. The problem is that I now realize the tongues don't perfectly fill the grooves so an exposed edge will look awful. I could cut it straight and make a bullnose moulding, but how to attach it cross grain so it is strong? I could make a long tenon and groove but could not glue it very often because of the cross grain. I'm talking abut 10 feet of length. Any ideas to attach the molding or ideas other than molding?