5 ms·
No, see https://en.wikipedia.org/wiki/5-over-1 https://en.wikipedia.org/wiki/5-over-1 "5" and "1" are not the number of floors, they are the construction type,
by coryrc 4y ago
No, see https://en.wikipedia.org/wiki/5-over-1 https://en.wikipedia.org/wiki/5-over-1
"5" and "1" are not the number of floors, they are the construction type, 5 being (primarily) built of dimensional lumber and drywall, 1 being reinforced concrete. The type for heavy timber is "4".
This, a building with CLT would never be 5-over-1. It might be 4-over-1, but I bet it's sufficiently inherently fire-resistant that most designs will be solely type 4.
- MichaelCollins 4y ago> No, see https://en.wikipedia.org/wiki/5-over-1 https://en.wikipedia.org/wiki/5-over-1 No, see https://en.wikipedia.org/wiki/5-over-1 https://en.wikipedia.org/wiki/5-over-1 > The name derives from the maximum permissible five floors of combustible construction (Type III or Type V) over a fire-resistive Type I podium of one floor for "5-over-1" or two floors for "5-over-2", as defined in the United States-based International Building Code (IBC) Section 510.2. > Some sources instead attribute the name to the wood framing of the upper construction; the International Building Code uses "Type V" to refer to non-fireproof structures, including those framed with dimensional lumber.[5][6] First sentence affirms my comment, second sentence affirms yours. I suspect the second usage is primarily European, or just mistaken. In America, 5-over-1 refers to the number of floors. Particularly, the upper five might be Type III not Type V, but it's still called a 5-over-1. And if there are two bottom Type I floors, it's called a 5-over-2.