How to rectify the lower part of the individual bathroom beam is not level

Construction as shown below: and make clear cement-based waterproof coatings.

Chisel the undense part into a hemp surface, and then use fine stone concrete to pound back, or not serious with mortar smoothing.

If the water has penetrated into the exterior wall, it means that the waterproof layer of the sedimentation tank under the bathroom has been broken, and the root cause needs to be repaired.

The best thing to do is to find out about the fine.

Send a picture to see, I don't know what the situation of the fake beam you are talking about. Then we can give you the corresponding guidance.