if you take these root notes as a root/fifth power chord.
 
This isn't the order but there's only two riffs so you figure it out.
 
Tune down a whole step to D.
 
F -----------------------------------------------------------------
C -----------------------------------------------------------------
G -----------------------------------------------------------------
D -0-0-0-0-0-0-1-1-1-1-1-1-3-3-3-3-0-0-0-0-0-0-1-1-1-1-1-1-3-3-3-3-
 
F ----------------------------------------||
C ----------------------------------------||
G ----------------------------------------||
D -0-0-0-0-0-1-1-1-1-1-3-3-3-3-0----------||
 
F ---------------------------------------------------------------||
C ---------------------------------------------------------------||
G ------4----------5--------------------6-5-----------------4-3--||
D -3---------4----------0-0-0-0-0-0-0-0-----0-0-0-0-0-0-0-0------||
 
There's both the riffs of the entire song.

By:  John McClanahan