Lateral Support for Mansory Walls
Hi,
I’m looking at the table below (Ching’s Construction Illustrated) for what I assume is the spacing of the lateral support elements based on Height and Length of wall. I’m not sure if I’m using the units right or if my math is incorrect.
How should the ratios be used to calculate the spacing?

Hi Dafne,
Let's say you have an 8" thick nonbearing exterior masonry wall. Given the chart in your image, the maximum L/t for such a wall is 18. That leaves only the 'L' as a variable. A reminder here that 'L' doesn't mean the length of the whole wall, only the maximum length between supports.
L/t = X > L/8" = 18 > L=8" * 18 = 144"
Given the above, the longest wall you could build without supports would be 144" or 12'0".
It doesn't matter what units you use for 'L' and 't' as long as they are consistent.
Hope this helps.
Best,
Anson
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