What is the roof of a house

The sky surface is an architectural term that usually refers to the interior of a building where the upper top surface and the lower top surface (the ground) are usually not less than 4 meters apart and have an area of not less than 10 square meters. Or it is an indication of the internal area of a building where the top is constructed of light-transmitting materials, usually the upper human roof section, the ceiling, which is the place where the top surface of the interior of a building is located. In interior design, the ceiling can be written and painted to beautify the interior environment and the installation of chandeliers, light tubes, ceiling fans, open skylights, installed air conditioning, changing the utility of indoor lighting and air circulation