Q imported from our old site, Face Lift Floors: My maple wood floor has developed a hump in the middle. It does it every year but a humid summer has made it a real hazard this year. Is this due to initially poor fitting, not leaving enough room for expansion? How can I fix the floor?
A: It seems that the harder the wood, the more unstable it is and susceptible to changes in environmental humidity. Maple is no exception. There should have been at least a half inch gap along the walls when it was installed.
I would recommend getting a dehumidifier or air conditioning unit for your house. Climate control is the best correction.
Original / moved link https://faceliftfloors.com/q-and-a/hump.php