The pea that sits between my ears is rattling around too much.
What is the proper term for decking consisting of only 1 x 2 wood slats?
If it is on the roof like your pictures, I would call it skip sheathing.
Marcel 
Funny you should mention that, It is the exact roof in question!
Thanks Hammah! (i’ve been waiting to say that) :mrgreen:
I would not call it decking at all. I would call it strapping.
Carla
That is funny, I would not call it sheathing either. ha. ha.
I would call it skipping a lot of sheathing. 
Marcel 
'Course if’n yur country folk what built that barn you’d just call 'em nailers.
Oh listen to mr. smarty pants using them high tech, big city words!