Hardwood floor splitting occurs because of excess moisture or humidity—but it can be linked to a number of different problems. We’ve outlined the common causes below so keep reading if you want to learn more or give us a call to get started on wood floor repairs in Maryland, Washington, DC, or Virginia!f you have a very damp crawlspace, the moisture can seep through the subfloor. This can cause your floors to take on the moisture and then release it into the room, resulting in hardwood floor splitting.