Slide 20 of 45
- When evaluating an existing building for possible retrofit, it is important to identify non-standard framing.
- Balloon framing is one type of non-standard framing
- In balloon framing, the intermediate floor framing joists are face nailed directly to the studs.
- The studs are continuous from top to bottom of the building.
- This creates a load path discontinuity between the floor diaphragm and shear wall.
- Balloon framed structures were common on the East Coast and Midwest until recently.
- Some older buildings on the West Coast are also balloon framed.
- The figure shows a balloon framed house.
- New symbol that will be in the 1997 UBC: The square indicates the wall height; the triangle indicates the schedule for shear walls
- When encountering this or any other type of non-standard framing, an architect or engineer should be consulted.
- We have discussed the importance of connections and their general role in the load path for resisting shear forces.