Moisture is getting in from the outside, one way or the other. It's not from seasonal heating and cooling. If that was the case, all the fireplaces would have it.HI, the mortar joints on the inside of my fireplace have bad efflorescence leaching. I think it is mainly coming from the heating and cooling cycles creating moisture in the winter time. My fire place is on a outside wall. I also have 2 other fireplaces in the middle of my house and I have no problems whatsoever. So my question is what can I do about the leaching problem in my motor joints? My chimney is capped and does not leak. Thanks
It's moisture traveling in from the exterior.