Table 601 Footnote a: Allows reducing wall fire rating on the top floor?

[marcarch]

Hi all,

I'm a sole proprietor with 20 yrs, but doing my first Type IIIA multistory building.

Per Table 601, the exterior walls need to be 2-hr. (All wood frame bearing walls.)
However footnote a says, "Roof supports: Fire-resistance ratings of primary structural frame and bearing walls are permitted to be reduced by 1 hour where supporting a roof only."

Is this to say, that all exterior walls on the top floor can all be reduced to 1-hr? (Barring any other requirements of course?)

 

[mtlogcabin]

Foot Note "a" is only applicable to Type I construction

 

[marcarch]

ARF!
Thank you