Unless you have a finished attic the ceiling joists are typically exposed.
Floor framing support wall above parallel to joists.
If the joists run perpendicular to the wall an adjustment should not be necessary.
When i draw plans i locate joists under bearing walls only for parallel walls off layout but i do it with two joists spaced apart the depth of wallplates above.
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Generally floor or ceiling joists run parallel to the rafters.
Floor joists and ceiling joists serve similar purposes.
The blocking provides a nailing surface for walls that fall between joists and serves as an evenly spaced fastening surface for finish materials such as drywall.
Score 1 for being load bearing.
If the joists are parallel to the new wall adjust the layout so that the wall is directly under a joist.
You would be able to check if this is the case in your home by going up into the attic.
If you have 3 or 4 inch diameter pipes running through the wall make the wall from 2 x 6 inch boards.
Nonetheless this does not ensure good floor performance.
However there is a large double 2x10 header above the entry way see picture 4 in this wall supported by a jack stud on either end see picture 5.
You may need to lift insulation or plywood to see the joists.
Thus for a 2x4 bearing wall two joists are below spaced 3 1 2 apart directly under.
However the floor joists must also be adequate to support the additional load from the wall.
This wall is running parallel to the floor joists above see picture 4.
Makes the plumbers and electricians smile.
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