I have a house built in the late 1970s and it has chipboard (plywood) floors. It is a two story house and the floors on the bottom floor (ground level) especially tend to creak loudly, especially in the winter when it is dryer. It is most noticeable in carpeted rooms that also have a carpet pad and not in non-carpeted rooms.
- The upstairs floors also creak but you with the exception of one spot can't hear it in the rest of the house.
- Downstairs there are many spots and in one room it is almost every spot which also tends to be the warmest room in the house even with all furnace vents closed due to a systems running (BOINC) always going.
- There is a 5ft dry crawl space on a cement foundation below the bottom floor, very well insulated and within the house's "seal" but is vented to the outside (non-fan). Note the room that is noisiest has a sealed combustion furnace directly below it so I can't do much "below".
I thought about it being a moisture / dryness of the boards and I have run a table top humidifier in the room with the door closed for a day to see if that works, but that does not noticeably helped and has not something I would want to also run on an ongoing basis due to other things in the room. Regularly shampooing or steaming the carpet would be impractical as well.
Are there any simple and inexpensive tricks short of replacing the floor boards and or putting down new carpet and carpet pads to reduce the noise generating by these creaking floor boards?