Parallel Vs Perpendicular To Floor Joist Wall

Some houses have the shiplap on a 45.
Parallel vs perpendicular to floor joist wall. The walls are typically non load bearing or lightly loaded. Is floor sheathing alone adequate for load transfer to the floor joists or should an additional joist be added. If the wall runs parallel to the ceiling and floor joists it is probably not a bearing wall. Score 1 for being non load bearing.
But if the wall runs perpendicular at a 90 degree angle to the joists there is a good chance that it is load bearing. If you have an older house with a shiplap floor the shiplap is perpendicular to the joists so the flooring is parallel to the joists. Also some brands of drywall aren t designed to resist sag parallel to the mounting lines and should only be installed perpendicular to the framing. Designers often ask if special considerations are necessary for partition walls that are parallel to the floor joists and located between the joists.
Assemble the wall on the ground sandwiching studs between the plates and fastening the studs to the plates with two framing nails at each end. This wall is running parallel to the floor joists above see picture 4. Short closet walls for example usually are not bearing. I guess you wouldn t have to lay it parallel but the shiplap has a lot more movement then plywood or osb.
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. However there are cases where a bearing wall is parallel to the joists. Align the wall in its desired position between the parallel joists snugging its top plate flush against the blocking. Score 1 for being load bearing.
If the wall runs perpendicular to the ceiling and floor joists there is a good chance it is a bearing wall.