RicodJour wrote:
....
Where do you live that you can get a 12' board into a basement? I
frequently have issues with 8 footers.

Where basements generally have walkout access is only places I've ever
considered drywall in basements, basically...

....

The OP said he doesn't care about going the full height, so there's no
reason to use 9' boards. I'm not sure where you're getting the 3-4"
thing - the room dimensions are both under a full sheet length/width.

Unless he would just like the full wall height covered, I pointed out
what many are unaware of--that there are 9' sheets available.

I was thinking in the 14' as 14 lengths and then didn't recompute when
making the comment about the short corners when suggesting the vertical
orientation, sorry...

--