There are the following reasons for the overflow around the window frame:

1. The structure is deformed and the sealing material falls off.

2. There are small cracks around the window frame.

3. There are holes around the window frame.

4. The installation error is large.

Waterproof treatment methods for windows:

(1) Clean the periphery of window frames, find leakage gaps and analyze the causes of leakage;

(2) For the parts with cavities in the wall, chemical grouting or other elastic waterproof materials should be considered according to the specific situation; (3) Clean the surface of the crack, and the surface should be free of oil stains, floating dust and other isolators;

(4) the elastic sealing material is embedded in the gap around the window frame;

(5) test the water to check the waterproof effect. Mainly do waterproof treatment on the outside of the window, generally scraping waterproof putty and brushing waterproof paint on the wall. Of course, if the foundation is waterproof in advance, the waterproof effect will be better. If it is indoors, it is generally not waterproof, because if there is water leakage outside, the waterproof effect inside will not be ideal. But from the point of view of moisture-proof, it is still beneficial to do waterproof treatment indoors, and it is necessary to use glass glue or do waterproof outside.