Please look at the 2 pictures.
Hopefully you can tell that before I moved into this house an air brick was fitted but was left blocked internally. Maybe not obvious from the picture but I also have a damp.patch were the air brick is fitted.
The damp.patch has only started or become noticeable after a new bathroom was fitted. Part of the new bathroom fitting which maybe relevant was a towel radiator fitted below damp patch and wallpaper above picture rail removed.
I have checked guttering roofing and in attic and all seems very dry and sound.
My theory for the damp.patch is cold air coming in hitting the brick that blocks the air vent and hot air from the new towel radiator causing some mild condensation and spoiling decoration by salt problems.
What is the best way to resolve this. Maybe block vent externally. Or remove internal brick to open up air vent.
The house was built in 1890 and looking at brick work I don't believe it has a cavity.
Thanks for looking.
Hopefully you can tell that before I moved into this house an air brick was fitted but was left blocked internally. Maybe not obvious from the picture but I also have a damp.patch were the air brick is fitted.
The damp.patch has only started or become noticeable after a new bathroom was fitted. Part of the new bathroom fitting which maybe relevant was a towel radiator fitted below damp patch and wallpaper above picture rail removed.
I have checked guttering roofing and in attic and all seems very dry and sound.
My theory for the damp.patch is cold air coming in hitting the brick that blocks the air vent and hot air from the new towel radiator causing some mild condensation and spoiling decoration by salt problems.
What is the best way to resolve this. Maybe block vent externally. Or remove internal brick to open up air vent.
The house was built in 1890 and looking at brick work I don't believe it has a cavity.
Thanks for looking.