It's difficult to say. Advertisements have a third of your picture/drawing and text covered.

 

fairviews.. you need to download adblocker if your having that problem.

as for the joists, based on the wall layout i would say from right to left as the walls along the stairwell are probably bearing walls

 

As Kirk, perpendicular, as that looks to be the shorter span.
But what's the problem?

 

I concur

 

I have never heard the term impact beam. Is that some sort of Texas slang?

 

This is the layout of rooms on the second floor of a home.
Would the floor joists typically run side to side, or front to back?

The second floor joists will typically run the same way that the first floor joists do. Have a basement or crawl space? Go look.

 

Thanks everyone. No problem really, just needed to know which direction my joists were running in. Thanks for the help.
Daniel, i used to watch all of those remodel shows on diynetwork and thats what they always called the big heavy structural beam in the loadbearing walls.

 

http://www.diychatroom.com/f49/complete-mobile-home-remodel-168570/

Mobile homes don't have floor joists.

 

its not a mobile home. MY house is. THIS house is not.