Yes, depending on species, grade, spacing, and whether it's a living space or bedrooms above.

I believe that 12' would be the max span.
Must be pretty bouncy

Pine, 16" on center

bedrooms the side where baths are the span is 13'-6"

in that case,

http://www.southernpine.com/media/SPtable1_060113.pdf

dmarc125 said:

bedrooms the side where baths are the span is 13'-6"

Click to expand...

the whole reason I'm asking is upstairs BR think they cut out window and put in French doors found this when we had "national window replacement " company come put in new replacement doors 2-1/2 months later locks are not lining up/working took crow bar raised up middle where hinges are and door locks work. While I had crow bars in pounded another spacer in locks work fine (for now) I am thinking that these doors need a header underneath them. would I be correct? or is my thinking that 12 X 10 is NOT enough to hold this steel set of doors up?

My span chart says that an SPF 2x10 that is just strapped can span about 12' 6" (I say about because it's in metric) and strapped and bridged it can span a little over 14'. 16' can be spanned by 2x12 @ 16" oc bridged and strapped, or 2x12 @ 12"oc strapped only, or bridged only (or bridged and strapped obviously)

It all assumes No1 SPF