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Timeline for How do I measure joist deflection?

Current License: CC BY-SA 3.0

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Oct 29, 2013 at 16:42 comment added BMitch @Zaralynda you assume that the level of the floor doesn't change significantly from one side of the wall to the other. You're looking at the difference in height where the laser level may show an exterior wall up 1/2" and the interior dividing wall down 1/2", that's a difference of 1" in level across the floor. Measure the same in other rooms, assume you are close to level from one side of the wall to the other, and plot the results to see if you're out of level and/or sagging.
Oct 29, 2013 at 16:38 comment added Zaralynda I added a drawing to the original question to show where there's a wall. How will that affect things? Thanks!
Oct 29, 2013 at 16:15 comment added Chris Cudmore You're going to have to assume that the joist was originally level. Then use the laser level to establish a baseline.
Oct 29, 2013 at 16:13 comment added Zaralynda There's a wall in the middle of the problematic area on the top floor. How do I measure with the wall where the lowest point would be?
Oct 29, 2013 at 16:08 history answered Chris Cudmore CC BY-SA 3.0