Help with venting chimney

Hi, so we covered the flue thinking the chimney was watertight but we have heard water dripping down onto the plasterboard. We are looking at roofers to make the top of chimney watertight but im worried about it now needing ventilation as moisture must be inside the stack. We'd rather not remove the board as we got it boarded up so it could be used as an internal decorative space. And If we drill holes it will let moisture drip. Would an elbow vent work as its 90 degrees so catches any water and keeps the fireplace dry. Thoughts? Thanks

Jun 11, 2025 - 01:50

Hi, so we covered the flue thinking the chimney was watertight but we have heard water dripping down onto the plasterboard. We are looking at roofers to make the top of chimney watertight but im worried about it now needing ventilation as moisture must be inside the stack. We'd rather not remove the board as we got it boarded up so it could be used as an internal decorative space. And If we drill holes it will let moisture drip. Would an elbow vent work as its 90 degrees so catches any water and keeps the fireplace dry. Thoughts? Thanks