Pipes for plumbing or central heating installations, in which the water flows, generate various kinds of sounds that are burdensome for the environment. The pipes also transmit other sounds generated in neighboring apartments. Therefore, they should not be released directly through the ceiling and the holes around them should not be covered with cement mortar. In the place of the passage, they should be protected with short sections of thermal insulation pipes made of polyurethane foam. We can also run them through sections of PVC pipes, and fill the gaps with flexible putty.