Chimney Termination

An open topped chimney pot or open stack with no pot fitted will allow some rain into the flue. With old unlined flues this moisture was absorbed into the porous mortar and brickwork of the chimney top. This will cause problems. Once the flue is lined with a smooth impervious liner the rain can run down the flue and may reach the bottom. This can prove both messy and unpopular. Some form of chimney terminal like a critter guard that will keep out the rain without impairing the performance of the flue is therefore desirable.