Brick Cladding Deflection Limits 3

[KarlT]

I have a project in Winnipeg, Canada with an exterior load bearing wood wall ranging in height from 20 ft to 30 ft. In addition, there is a partial height exterior brick veneer from the foundation up an elevation of 7'-0" above the foundation.

To ensure the brick doesn't get unacceptable tensile stresses we need to limit the deflections of the structural backing to L/720. Now if the brick ran full height, I would check the mid span deflection and compare to L/720. However, in this case how would I check that the wall deflections are acceptable? I would think that L/720 at mid height of the wall is too restrictive, since the brick only runs between 1/4 and 1/3 of the way up the wall?

 

[haynewp]

OK, for my case of a 10.5' cantilver, you would just put 21' in the L/600 formula to find the deflection allowed then limit the ACTUAL end of cantilever deflection to that amount, correct?

 

[JAE]

That's generally what I've done - Of course you'd probably want to look at the absolute lateral deflection at the top of brick just to get a sense of how its behaving.