Platform Framing

The term platform framing is used by builders to refer to two (or more) story houses that are built one level at a time; meaning each floor becomes the platform on which the next set of walls are built upon. The walls are positioned on the sub flooring. 

The Advantages of Platform Framing

1. Uses shorter pieces of lumber.
2. Provides a solid floor surface upon which the carpenters may work.
3. Durability and structural integrity.
4. Hollow spaces allow for fire stops at each level.

The Disadvantages of Platform Framing

One disadvantage with Platform Framing is called vertical shrinkage. Because the floor is made of a thick layer of wood with the grain running horizontally, it may lead to vertical shrinking of the frame when the wood dries. This may lead to stress on the finish surfaces.

Platform Framing is the most common framing method for houses and small apartment buildings in the United States. The advantages far outweigh the disadvantages.  An outdated from of construction called “balloon framing” is available, but Platform Framing is the preferred method.