In which type of construction are floors built as platforms for the next level?

Platform framing is characterized by the construction method where each floor is built independently as a platform for the level above. This system involves constructing a single floor at a time, allowing the framing of the walls for that floor to be erected on top of it. Once the floor system is completed and secured, the framing for the next level can be added on top of that platform. This method provides structural stability and is particularly efficient, as it simplifies the construction process by allowing builders to work on one level at a time, reinforcing the overall framework as the building progresses upwards. In contrast, balloon framing involves continuous vertical studs that extend from the foundation to the roof, while post-and-beam methods utilize heavy timber posts to support the structure, and prefabricated framing indicates that components are manufactured off-site and assembled on-site, which does not specifically imply the platform approach seen in platform framing.