Chimney & Fireplace

Drip of water between stainless flue liner and chimney blockwork during heavy rain and wind.

Anonymous user 03/03/2024 - 3.02 PM

Moved into a new build house with a wood burner as a secondary source of heating. A double skin stainless steel flue was installed lining a block built flue leading up to a brick chimney and terracotta pot. Lead flashings are new with the liner passing through a lead sheet which is integral to the stack. A leak was noted during construction of the house so a storm cowl was placed on the stack. This did not cure the problem. The drip continued when, it seemed there was stormy weather from the north-east. The builder inspected the brick work and flashings and could see no cracks or faults, but coated the outside of the brickwork with PVA/Cement mix to stop ingress of water into the brickwork on the north-east side of the stack. With weather now coming in from the south-west water is continuing to drip onto the steel plate installed at the bottom of the flue when the stove was installed. This is worse than Chinese water torture. To prevent water/damp seeping into the lounge I have lit a small fire to warm through the stack. This is making no difference to the constant drip. Can anyone suggest a cause or remedy?