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# IBC Construction Types
International Building Code (IBC) Section 602: Construction Classification
[[ibc_s0602|IBC Section 602: Construction Classification]]
lists 5 major construction types based on fire ratings/materials.
## 5-Over-1 Construction
"5-over-1" construction denotes a building
with levels of combustible construction
above levels of non-combustible construction.
buildings with two non-combustible levels (5-over-2)
and Type III upper floors (3-over-1)
are also common,
though "5-over-1" denotes the general practice.
> [!info] 5-Over-1 Construction ^5-over-1
>
> "5-over-1" construction denotes a building
> with levels of combustible construction
> above levels of non-combustible construction.
>
> buildings with two non-combustible levels (5-over-2)
> and Type III upper floors (3-over-1)
> are also common,
> though "5-over-1" denotes the general practice.
## Type I: Fire Resistive Non-Combustible