1. Maintenance function: in order to maintain the top floor of the house and prevent cracking and water leakage. When building a house, it is necessary to have a certain curing period after pouring important structures such as roofs, floors and beams, so that the concrete strength can reach the design strength before adding water. Roof water storage can increase the humidity of concrete, thus playing a role in maintenance.

2. Thermal insulation: In hot summer, water storage on the roof can reduce the temperature; In cold winter, roof water storage can play a role in heat preservation, reduce the speed of indoor temperature loss and maintain indoor temperature.

3. Protection: In rainy season, if the concrete structure of the roof is soaked in rain for a long time, it may crack and loosen, leading to water leakage. Storing water on the roof can keep the concrete moist and avoid cracking and loosening, thus protecting the building structure.

4. Drought prevention: Guizhou has a dry climate and is prone to drought. Roof water storage can reserve a certain amount of water resources for emergencies and alleviate drought.

In a word, the function of roof water storage in Guizhou is mainly to maintain houses, insulate heat, protect structures and prevent drought.