Is there anything that can be done to reverse the warping of wood floor boards? There is a crawl space..
The problem is the crawl space , make sure it is well ventilated . You may have a moisture problem
Nope. The most you can do is to try to warp them to a shape similar to the shape they were once in, but that is near impossible as well as time consuming, and the damage done by the warping isn't going away.
The cupped side has less moisture content than the bowed side. Normalize by the best available method. Most often I've seen moisture rising from a crawl space (dirt floor) which adds moisture to the unseen wood (floor joists, sub-floor, etc.). If the floor boards are painted/varnished or otherwise covered, it may have to be removed, then allowed to normalize. A better way may be to put a dehumidifier in the crawl space and just let 'er run, making sure to drain the collected water outside. Of course, this won't do any good if the dirt isn't covered with a non-permeable membrane, like Visqueen. In dry climes, just blocking the dirt floor may do the job, without the added cost of running a dehumidifier, but would take some time.
