But efflorescence might also mean that water is running inside of the chimney flue or chimney structure.
Water running down chimney breast in attic.
If the stringer is un level water can travel a ways and even wind up at the chimney.
Well the salts accumulated on the roof timbers are there due to years of tiny water ingress and condensation on the underside of the roof slates.
The chimney crown covers the top of the chimney to help protect it from the elements.
This can manifest in a number of ways such as.
Efflorescence on a chimney might be just cosmetic as wind blown rain wets the chimney sides and leaches out mineral salts which remain white on the masonry surface of the chimney.
If you have a broken gutter in heavy downpours water can run down the face of a wall and seep into any splits or cracks in mortar presenting as damp in your chimney breast.
Every step has decrease the amount of water but i can t get that last bit.
Broken or blocked gutters can cause rainwater to filter and collect in unwanted areas causing water ingress and damp in your chimney.
I still have a small bit a water coming down during occasional heavy wind and driving rain.
It hangs over and down about 2 inches off the top of the flue.
This runs down and wets the timber leaving minerals they dissolved along the way.
More on this later.
2 water runs down the brickwork inside the house or attic.
This portion of the chimney prevents water from entering the flue but also prevents wear and tear on the masonry.
Water could get into the attic or above your ceiling and either drip to the floor or roll along the stringer the long piece of wood that spaces out the roof trusses and runs the length of your house.
1 water runs down the flue.
Repeated wetting and evaporation has concentrated those seen here.
3 exposed chimney brickwork gets damp and white lime deposits form on.
The slanted crown should provide a downward slope that will allow for water runoff.