My mother has a rental house about 70-80 years old with 2" wide wood floors. Not sure if they are oak or pine. Two sets of the boards within 3 feet of each other are "tenting". For one set the tenting occurs about 5-6' in length. The second set is probably less than 3' in length so far. There doesn't seem to be any moisture (leaks, etc) and I suspect the problem could be they are too tight and the humidity and heat have swollen the boards. What is the best way to repair? Any recommendations on books or printed instructions? Or is this best handled by a professional?
Even though the floor is now dry it was probably exposed to excessive moisture at some point in the past. If you want the repair to be unnoticeable, it is best to have a professional do it. Short of that, there are several home repair books that cover hardwood floor repair. Remember, you will probably need to refinish the repaired area or the entire room in the process.