OK, I may be calling the two-by at the bottom of a stick built wall
section the "plate" in error. It may have another name and I'll be
happy to learn it as well if that is the case.

But, for now, I have a question as I re-build the awkward work of a
previous owner with whom we can not converse (or trust were we able!).

Tis fellow had "opened up" the kitchen/dining area by simply removing
nine or ten studs and the "plate" they had been attached to. As the
flooring was either added to (there is a layer of three quarter inch
(5-ply) plywood on top of a sub-floor of one-half inch (4-ply)
plywood.) or originally built in two steps. The is, the 4-ply is laid
over teh floor joists but is under the plates for the walls and the 5-
ply lays over that - butted up to the plates in question.

MY CONCERN is that there is insufficient nailing area with half of the
plate covered ny the 5-ply. I was intending to added pieces of two-by
along the plate I uncovered/replaced (I am replacing the wall section
DUFUS removed as it supports the - you guessed it - roof!) which would
provide a hefty back stp for any molding to be added later on.

Then again, is this necessary? Is the three quarters of an inch
standard some how? For some reason, I thought the plates were nailed
to the flooring - but half-inch flooring seems terribly weak and
adding the 5-ply after teh walls were up abut before the house was
finished (as opposed to a retrofit) seemed extraordinary.

If you "know" this two-layer approach is or is not "standard" I would
appreciate the references.

The DUFUS also "opened up the Kitchen" by removing the beams that tie
the two walls of the home together and nailing pretty wood (flooring)
to the underside of the roof rafters - OH, Boy do I have work to do to
fix that "improvement" before the walls tilt out! But that's a "whole
'nuther story/"