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We had a hump in our floor and pulled up the subfloor to try and determine was was wrong. It appears that where the floor joist meet on the main beam they are not longer level but have raised up /\. The main beam appears to be level so I am wondering if outside walls perhaps settled over time. Home was built in 1980. I would like to know the best way to make this level again, just shave off the uneven joists or is there a better way? Photo attached
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Outside sank?
Main beam raised? Someone cranked on the lally adjusters?
Joists sagged in center causing ends to tip up?
Built that way?
Need on site investigation to determine what happened
 

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Should be as simple as using a long level on the sub floor to see the floor runs low on the outside.
What's supporing the main beam?
Are there any shims under it?
 

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Sure does look like under sized joist and they could have at least over lapped them far further then they did.
 

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I agree, Joe. Problem is the joists start out straight, then because of under-sized, they sag (crown-down) over time. Seen this many times when tying in an addition (years later) past the existing exterior wall; either match the existing floor line (not level, but "dished") with the new exterior wall higher than level, or set it level and let the HO walk up-hill on the same incline they have sub-consciously grown used to over the years...point to show them before starting the project.

Gary
PS. The laps are not to code either, good catch; http://publicecodes.cyberregs.com/icod/irc/2009/icod_irc_2009_5_par026.htm
 
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