There's a sizeable gap between the edge of hardwood flooring and the foundation by this fireplace:
You can see that the wooden base the strip of floor was nailed too ends about inch early:
As a result, many of the nails in the strip were justing stick out into space and the board is one bad step away from cracking in half. My first impulse is to cut shove a 2x1 in the gap so the board won't hang over the edge. Is there any reason not to do this? Is there a special kind of wood I'd want to use to avoid termite / other problems in the future?