The leak on our wall is that every time we water flowers upstairs or something, it leaks along the wall. This is an old community.

If the wall joints are large, you can buy a bottle of polyurethane foam caulking agent or a small bag of other powder caulking agent to deal with it first, and then use the following methods to solve it.

1. Infiltrate oxalic acid aqueous solution at the joint of the wall, and let it permeate to the leakage place until it is 50% to 60% dry.

2. Buy glass water for building (also called sodium silicate), which is very cheap, about 1 yuan/kg, and continue to pour it into the hole where oxalic acid permeates, so that when the glass water meets oxalic acid (joint), it will produce tough solid silica gel to plug the internal hole. Finally, wipe off the excess glass water (or silica gel) with a cloth, leaving no trace, and the surface looks the same as before.

This method is very easy to use, and it is a simple process of waterproof wetting agent, and it can be done at ten yuan and eight yuan. Of course, if you don't see cracks at the joints of the original wall, you can deal with them directly according to the tips of 1 and 2, and you don't need to caulk them.

Note that the construction must be carried out upstairs.