Hi, I am moving to a new house but the floor wood boards are very old and have some big gaps and holes in between. Is it a serious issue that need to be fixed or this will be ok when covered with carpet?!
It will depend on how big the holes are and how the floor moves
If the floor itself is fairly sound with gaps up to thumb size between boards and no dipping when you walk on it then this can be overboarded using 9mm sheets prior to carpeting if you can send a picture then will be able to give you a better idea