How to Fix a Broken Floor Joist
Jacking the Joist
I placed the new joist in place and then set up a 6 ton hydraulic jack with a jack post. The new joist fit in the space sideways but would not tilt into vertical position. The reason for this was the new joist, when at a 45-degree angle touches the top of the beam and the bottom of the floor boards. Once the joist is vertical it will fit fine – hence the slight jacking.
I plumbed a double 2×4 jack post and placed it directly under the cracked joist in order to lift a small sag out of the old joist as well as create a tiny bit of room for me to get the new joist against the old one – at the beam.
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