Just like hands and lips, in the winter, sport floors are subject to cracking and splitting. According to the Maple Flooring Manufacturers Association (MFMA), wood is a hygroscopic material which means when it is exposed to different temperatures and humidity levels, it will release and absorb moisture until it is balanced with its surrounding atmosphere.
Since humidities are so low in the winter months, it is not unusual for floors to show shrinkage cracks. Normally, these cracks close up in the spring; however, humidification systems should be used to maintain proper humidity levels. Indoor temperatures should remain between 55 and 75 degrees and humidity levels should stay between 35-50 percent. If the cracks remain, contact the flooring installer.