Smoke in basement from upstairs fireplace
I have a 1965 home with an up/down fireplace (both flues in one chimney). We've always had a problem with smoke from the basement fireplace when we are using the upstairs fireplace. A recent inspection showed many cracks in the upstairs flue joints. The chimney company repaired the cracks with cerfactory (sp?) cement saying that was the reason for the cross-smoking. Well our first fire today and smoke again! I'm at a loss. The fireplace has a fresh air inlet and both flues have Chimilator top mount covers. The basement's is closed.