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If there are no cockroaches in the house, it is foreign, and cockroaches can fly and crawl. It should be extinguished and not allowed to climb to other places. If you lay eggs there, it's troublesome.
Watch out for possible entrances, and don't let them in again.
Start by finding the occupants on the third floor. Tell him about the water leak in your home. Then find a property company to help you deal with this. After the property company came up with an opinion. The family on the third floor is going to take care of their bathroom.
If there is a blockage problem, first suck it with a rubber puff and give it a try. If the problem cannot be solved, use a through strip made of thick iron wire to dredge. If it still doesn't work, pour the chemical cleaner into the pipe and wait for it to dissolve the blockage. >>>More
You're right, but it's hard to implement. Is your home south or north? It's also a hassle to punch holes in the wall. Access to the main pipeline to dig the ground, but also to break the main pipeline, do you have a management unit?
Those should be termites, and it is recommended to find a professional insecticide company to check them out immediately.
Is there a crack in the pipe, there is gas.