How to prevent water seepage at the junction of roof and back wall

There are cracks in the roof of the new house and water seepage on the wall, which should be the responsibility of the property.

The method to solve the leakage of outdoor wall into the room;

1. When there is local water seepage on the external wall of a high-rise building, the internal paint can be removed to find out the leaking brick joints. Loose mortar in brick joints can be removed, washed clean and filled with 1: 2.5 cement mortar.

2. When there is water seepage in a large area, but there is no obvious crack on the exterior decorative surface, the exterior decorative surface should be scrubbed clean. After drying, the component A and the component B of the cationic chloroprene polymer emulsion are mixed and stirred evenly according to the ratio of 1: 1, and then 42.5 ordinary portland cement is added according to the water cement ratio of 0.4, and the cement slurry is stirred evenly. Treating brick joints by pointing with polymer cement slurry.

3. When water leaks along the bottom of the frame beam, it is necessary to remove the decorative layer at the crack of the external wall, scrape off the mortar in the crack at the top of the brick wall, rinse it off, wedge it with iron sheets, then embed it with 1: 2.5 cement mortar and recess it into the wall 10mm, embed flexible waterproof sealant, and then fill the decorative surface of the external wall.