3 ms·
> 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
by 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.