Leaking village house wall

I rent the top floor of a village house near Shatin. Love the place, except for a persistent leak on master bedroom wall! The leak has been there almost since I moved in 10 years ago, and wondering if anybody here would have ideas about finally fixing it…


Every time it rains heavily, water leaks in from under the air conditioning unit. The wall gets thoroughly wet, and sometimes there’s even a small pool on the floor. Electric socket under the unit is also wet inside (and therefore not used).


I reported the problem to the owner, who sent guys to repair it. They first drilled holes into the wall under the unit, and pumped a kind of silicone filling or such into the wall. Holes were filled, wall painted, and I had a big job cleaning all the drill dust from every surface in the room and half way down the corridor. Next time it rained, the wall leaked just as badly as before!


The owner arranged similar kind of drilling and filling operation a few more times, to no avail.


Then they removed the air conditioner and the metal frame, and added cement on the shelf to make it a rounded shape so that water would not collect under the air conditioner. This did not help.


Then they drilled off the top wall layer under the aircon for about a square meter area, down to the brick layer. They added layers of insulating rubberlike paint, cemented and painted the wall again. They also climbed out of the window and checked the outside wall for breaks or holes.


Typhoon Goni has just passed, and the bedroom wall is sopping wet. There are big ugly permanent mold stains on it, and I could just use a spoon to scoop off the softened wet cement. Paint has peeled off the wall long ago.


Is there anything else that could be tried, other than demolishing the wall and building a new one??


A friend suggested that too much sand was used in the cement mix when the original wall was build, and it therefore works like a sponge, sucking in the water. (Though if this was the case, why the wall leaks only in that one place…?)


Any help? Don’t want to move out, but the mold stains and if the wall one day finally collapses…

Try Arthur 98135404