Why is the brick crumbling around the air ducts on the facade?
So far I have not found a solution to the problem: a two-story house, in which the second floor is surrounded by facing brick (walls in one brick, around the ducts in half a brick with insulation mineral wool), and a facing layer (0,5-2cm) of brick in places where air ducts cracked and gradually crumbling. Such air ducts are two.
- Photo 1 is the duct for the gas stove.
- Photo 2 is the air duct for the gas boiler. More "problems" in photo 2.
The gas stove and boiler are on the first floor of the house and usually the second floor is heated less than the first floor. 1.5 years ago blotted the walls with liquid glass – does not help.
Can anyone suggest – what can be done to stop it/strengthen the wall and can what inexpensive close before the coming winter. Break everything down and redo – not an option
Answers
It is necessary to waterproof the masonry-roofing joint. Insulate the brickwork with a layer of waterproofing from the roofing pie to prevent moisture from escaping into the brick during the off-season. Only after that can the masonry be restored....
I would do a thorough revision of the apron around the pipe – water from the roof should not get on the brick, neither in summer nor in the off-season, when the snow does not let it escape and its level rises.
Revision involves checking the compliance of the executed / actual to what is intended. In this case, compliance with the junction of any typical solution – they are the same in all manufacturers of roofing materials. I think that the brickwork in your case suffers the least from condensation, the greatest from rain and melted snow. From the top cap, water is likely to run down the surface of the masonry, and the brick naturally soaks it up. The surface of masonry can be protected by coating waterproofing it, but you need to know the temperature (limit) of heating. Almost all compositions are vapor permeable.
