These are the horizontal structural support members of
the floor system that hold up the floor sheathing. Floor joist are
usually 2 x 6, 2 x 8, 2 x 10, 2 x 12 or 2 x 14 and can also be in the
form of engineered lumber, like truss joist.
Most framers referred to a joist as a structural
framing member that supports a floor or landing. They can also be refer
to as structural roofing supports, but rarely are.
When building stairs, joist will be used in your landings, whether
they're in the middle of your stairway or at the beginning or end.
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