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A sagging floor

Posted by Bruce M on May 17th, 1998 10:41 PM
In reply to Sagging Floor by Mike on May 14th, 1998 03:32 PM [Go to top of thread]

2 of 2 people found this post helpful

Hi Mike
Assuming the existing floor joists are original, they have had 130 years to go from 'compression' support to 'tension' support. That is just a fancy way of saying that the wood fibers initially resisted deflection by resisting being compressed along their long axis......but now they resist deflection by resisting being pulled apart. It will take literally months or even years to put upward force on these wood fibers to 'push' them back together again so the joist is flat....which means you would have to put a series of screw-type house jacks under the weight bearing members and continually put lift into the wood. It will probably take a very long time.

Your best bet if you want a flat floor is to pull up the subfloor and sister onto each side of each joist, kiln dried dimension wood (2X?) so that you get a flat surface to then put your subfloor back on. A lot of work, and most builders don't want to go to this much time and work. I've done it once...and it is a lot of work....but then what is it worth to you to have a flat floor? :-)


Bruce M

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