1. Building structure: Building structure is one of the biggest factors of the top floor building area of the factory building. If the structural design of the factory building is reasonable, steel structure and concrete structure can be adopted, and the number of floors and building area can be increased on the premise of ensuring safety.
2. Land use: Another factor with the largest building area on the top floor of the factory building is land use. If the land use where the factory is located allows the construction of high-rise buildings, then we can make full use of land resources and increase the construction area of the factory.
3. Building height: The maximum building area on the top floor of the factory building is also related to the building height. If the building height is high, the building area of each floor can be increased accordingly, thus increasing the building area of the top floor.
4. Building use: The maximum building area on the top floor of the factory building is also related to building use. If the building needs more space, such as installing large equipment or storing a lot of goods, then it needs to design a larger building area to increase the building area of the top floor.