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Frankly, in an older home like yours seems to be, I would not try to correct so small a sag. But at the same time, so small a sag should be easy to fix. Yes, the typical solution is just what you propose -- place one or two 6' jacks in the basement below the sag and span them with a 4x4, underlying 2 or more joists. And yes, cracked plaster is a risk. ...


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Bored Holes Simply following building code, you'll only be allowed to bore a 3 5/64" hole through a 2x10 joist. A 2x10 is actually only 9 1/4" deep, and building codes set the maximum hole size to 1/3 the depth of the member (9 1/4" / 3 = 3.08333"). Adjusted Framing If it was only a joist or two, boxing off the section might work. Using this approach for ...


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Use some self-leveling mortar or concrete. It's a mortar/concrete that is liquid. You pour it out, and help it a bit and it levels itself automatically. If the slope is extreme (more than an inch or two), then get it semi-close (but lower) with some regular concrete, then finish with the self leveling stuff. You say joists, but are these joists actually ...



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