In multistory Type V buildings using platform methods, what is present between floors in the exterior walls?

• A. Double plates
• B. Studs
• C. Insulation
• D. Vapor barrier

Answer: (A)

Platform framing builds each story as a separate unit, so the junction where one story meets the next needs a solid horizontal connector. That connector is a double top plate placed on top of the wall studs at the floor line. Two plates stacked together create a continuous load path that transfers the weight of the upper story down into the wall below and helps keep walls aligned across levels. It also provides a strong nailing surface for the floor joists above. The other elements—studs are vertical members, insulation and vapor barriers are part of the wall assembly but do not function as the bridging member that sits between floors in this framing method.