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ang115 01-03-2013 10:26 AM

Floor joist issue
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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

joed 01-03-2013 10:30 AM

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

joecaption 01-03-2013 11:24 AM

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?

Gary in WA 01-04-2013 04:17 PM

Add the code-required minimum blocking;

If the span is greater than 9' to the next bearing, they may be over-loaded;

Never narrow a joists depth.


joecaption 01-04-2013 04:26 PM

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

Gary in WA 01-04-2013 06:09 PM

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.

PS. The laps are not to code either, good catch;

paintdrying 01-04-2013 08:12 PM

Boy, that is hard to look at. At this point I would plane down the higher "joist and cover it back up.

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