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handling joist deflections / alignment when in parallel with bear ing wall

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A nagging problem that needs good solid solution!

Situation:
Roof joists run in parallel with CMU bearing wall.
Roof is gabled, joists will be double gabled (no ridge beam).
CMU wall follows slope of roof.

Problem:
Camber and deflection of joists make it nearly impossible to line up with
the top of the wall?
Construction tolerances for the wall and bearing of the joist could compound
this effect.

Solution:
Specify top of the wall to be slightly lower than the bottom of the decking.
Use light enough decking so it is a bit more flexible.
For interior walls running in parallel with the joists discontinue the
decking to obtain more flexibility. Weld both ends of the decking to the
steel bearing plate on top of the wall. Use washers or small plates to
compensate for the inaccuracy.

These are not meant to be independent solutions, rather a total recipe.

What do you think. What have you done to remedy this situation?

Ghassem.