In the building structure, do water pipes have to be wrapped with thermal insulation materials? I work in Nanning, Guangxi, and it is above zero degrees Celsius all the year round. Do I also need thermal insulation for water pipes?

The design, installation, inspection, and operation of water pipelines are not related to architectural structure! That's the content of water supply and drainage or HVAC major.

tap water in Nanning area does not need heat preservation, but heat preservation and heat insulation are necessary for central air-conditioning pipelines or steam pipelines with cold water and hot water as media, which is always required to save energy.