How do I find out how much my wall is bowed?
All you need to do is is find out how much the wall is bowed, or deflected from straight. That's easy to do with a string that has a weight attached to one end.
Take the string, and hold it up to the top of the wall (by the rafters) with the weight down at the bottom, near the floor. Have someone move the string out from the wall until it just touches the wall at the bow. Then measure the distance from the wall to the string, right at floor level. This is the total amount of deflection.

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