I have a vacation home and when we left our floors were fine. Now they are weird shapes and or are making noise when we walk across it. Why is this happening?
This is known as the “greenhouse effect”. Your hardwood flooring will still react to moisture and humidity changes within the home even if you are not there for extended periods of time. Most of the time, a house has been closed off, its central air units and other humidity control devices, if any, have also been shut off during your absence. This causes the heat that is trapped by the house during the day to stay in the house. When the house cools at night, condensation will form in various places of the home and over time this constant “up and down” effect wreaks havoc on your hardwood flooring. Once you’ve entered the home and caused constant humidity levels to re-balance in the home, you’ll need to take measures on repairing cupping, crowning or even buckling if it has occurred.
When you leave the home again, leave some of the windows a bit open to allow for proper ventilation of the home. Use window blocking bars, sticks in the window sills or other security devices to prevent the windows from opening fully in your absence.
Text extract from woodmonsters.com