On Sun, 7 Feb 2010 06:06:21 -0800 (PST), Mikepier
wrote:

I am nearing completion of my attic project. I recently put in an
attic stairs and putting in 3/4" OSB plywood for the floor, replacing
the old T&G planks I had up there. I live in a split level 50 year old
house. The attic is 2X6's spaced 16"OC. It spans approx 20' X20'.
Below are some walls forming a bedroom closet .Although I am not sure
if this is a load bearing wall for the attic,

I would think that what makes a load-bearing wall is not what is in
the attic. Because anything near the wall and in the attic will rest
on the wall to some extent.

And I didn't think what determined a load-bearing wall was the
construction of the wall, assuming it is made like a standard wall is
made and not of some flimsy construction.

I thought a load-bearing wall was determined by what is beneath it.
Is there another wall directly beneath the closet walls that hold them
up. All the way down either to the foundation or to steel girder that
spans the basement.

Am I right?

I would think it does
add some support. But realistically how much weight can be put up
there? Is there some sort of guidline?