Is it common for soil vent pipes to make noise when the sun hits it Have one internal to the front of the house and one external to the back of the house. When the sun rises in the morning, there's no need for an alarm clock as it (internal) sounds like the whole thing is cracking very loudly. The same happens late afternoon when the sun hits the external pipe on the back wall. Although made of plastic it sounds like wood cracking really loudly but it's definitely the pipes warming up. How long does this last if they are new.