We recently moved into a home (built in 1982) and it has a wood burning fireplace. We love having a wood burning fireplace, but we've recently noticed the hearth gets very cold and there's quite a draft coming from the fireplace. We've read and been told to close the flu and hold a tissue in the fireplace to see if it moves (indicating a draft through the flu). We've done that and the tissue does not move. We've used fireplace caulking around the fireplace between it and the brick surround.
The draft seems to be coming from the vents underneath the fireplace (sorry, not sure what that's called). It's as if the area around the fireplace itself is letting a draft in. We want to continue using the fireplace and hate to block these vents, but we've covered them with towels for now while it's not being used. Is there a way to remove this vent covering and insulate underneath there or is there something we should do at the top of the chimney that will solve this?
Replacing the insert is a bit costly for us right now. Is there anything else we can do to cut down the draft from under the fireplace?
Thanks in advance for your help!