Is the putty on the wall really caused by the leakage of the outer wall?

There are two reasons why indoor putty falls off and the wall is wet. There are two reasons:

1. The ceramic tiles on the outer wall fall off in a large area, and long-term rain causes leakage.

Some of the external wall tiles are well preserved and preserved, but only a few are dropped off. When it rains, the rain water is slapped on the tiles, and is quickly drained away due to the influence of gravity. Except for the continuous pouring of heavy rain that lasts more than ten days, a small amount of rain water may enter the room, but your indoor putty powder is large. Falling off, it can be ruled out that it is the cause of the outer wall.

2. The original waterproof layer of the parapet on the roof is damaged, and long-term water accumulation in the structural layer penetrates into the room and causes water leakage.

The building has a long service life and is affected by geological settlement (it can be seen by whether there are irregular cracks in the room). The waterproof membranes of the weak waterproof parts such as the original parapet on the roof and expansion joints appear under the influence of stretching and deformation. The situation of shedding and cracking causes the water accumulated in the structural layer to lose the barrier of the waterproof layer. Through the joint of the parapet and the floor layer, it penetrates from the top to the lower red brick structure (shown below), red brick Sparse and porous, it absorbs water into the room, causing the interior wall to be wet for a long time and the putty layer falls off.