simple joist bearing question

huangyhg

simple joist bearing question
in masonry construction, i have been told it is common practice to slope the bearing plates for joists using grout.  (allowing the joist to slope the typical 1/4 in/ft +/- and also providing a flat surface for them to bear on.)
it makes sense to me, yet i can't find any documentation to prove the "rumor" i have heard.  i glanced throught the ncma tek notes and came up empty.  does anyone know where i can find something?   
1/4" per foot is "essentially" level.  try to calculate the horizontal component.
steeper roof pitch such as 4:12 etc are different, however.
if the slope of the joists is known, the manufacturer can design the bearings to bear on a flat surface while providing a sloped joist.
i consider myself lucky on steel inspections when the bearing plates line up with the joists on both sides of the span.
are you talking about steel or timber joists. timber will rot if it is left to bear directly on grout.