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Old 08-13-2012, 07:49 AM   #1
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floor joist repair


My existing home has 2 x 8 floor joists. When the previous owner finished the basement, he cut 1" out of the bottom of the floor joists so that he could push the 1/2' copper piping flush mount. From there he drywalled the basement ceiling. I wish to repair this structural defect. How do I do it? M

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Old 08-13-2012, 08:29 AM   #2
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floor joist repair


How long of a span are the 2x8 floor joists? Thanks

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Old 08-13-2012, 08:56 AM   #3
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floor joist repair


12 feet
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Old 08-13-2012, 09:13 AM   #4
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floor joist repair


Where in the 12 ft span did he do this? Was it near the walls or near the center? Are there cracks above the notch out like the joist is starting to sag? Was only 1/2" notched out or more?

More than likely a 1/2" notch on an 8" joist should not cause any problem. I will let more expert advise than mine confirm this.

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Old 08-13-2012, 09:20 AM   #5
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floor joist repair


The notches are centre span and are 1/2"-1 inch. I havent noticed any cracking, etc in the joists. I dont think the joists are at risk of failure however I wish to correct this problem as someday if I wish to sell the home, it could be a deterent.
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Old 08-13-2012, 09:32 AM   #6
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floor joist repair


I'm more curious why you ripped out the drywalled ceiling? Are there bigger issues to be dealt with? What are you replacing it with? If going to a drop ceiling just drop the pipe down below the joists and sister a full 2x8 to it. Under it or through it are your options.
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Old 08-13-2012, 09:33 AM   #7
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floor joist repair


? How did you find out it was done if there was drywall installed over it?
In order to fix it the floor above or the ceiling below would have to come out, a whole lot of work and little to gain.

If the floors not saging an the drywalls not cracking, forget about it.
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Old 08-13-2012, 09:39 AM   #8
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floor joist repair


The kitchen drain pipes were clogging so I wanted to access the drain pipe therefore removed the drywall. My plan was all along to pull the existing drywall ceiling out and install a drop ceiling so that there is easy access to plumbing, electrical, hvac ductwork, etc. That's when I found this issue.
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Old 08-13-2012, 09:40 AM   #9
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The drain pipe has been replaced. This issue had nothing to do with the notched joists.
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Old 08-13-2012, 09:59 AM   #10
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floor joist repair


If you can spare the head room the fastest cheapest way would be to just install some 2 X 4's laying flat againt the floor joist, if you put some constrution adhesive on the joist first then use at least 3" ceramic coated decking screws you have in effect made an I beam.
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Old 08-13-2012, 10:17 AM   #11
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floor joist repair


Some figures;

assuming the following; span = 12ft; joist spacing = 16"; code live load 40lbs/sq ft; dead load 10lbs/sq ft
and assuming there is only floor above (ie no partition or suchlike)
then each joist will be supporting approx. 800lbs.

If the notches are near mid span, then the joists will for practical purposes be 2x7s.

Under this load, the bending stress will be something over 1100lbs/sq in.
Most structural timbers can go up to 1200lbs/sq in bending stress, and some codes allow a small increase for load-sharing between the joists

From a structural point of view, IMO his floor is ok, but as he says, a problem may arise if he comes to sell. Some clueless surveyor may point this out to the buyer and set alarms bells ringing unnecessarily. Best thing might be to arrange his new ceiling so the notches can't be easily seen.

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