These photos show the way the previous owners of my house used a jack post to brace sagging floor joists. I'm not sure of their method, so I wanted to check what the correct method is.
Angle 1
Angle 2
Correct way to use jack post
joistspost
Related Solutions
A properly sized floor joist should never deflect. Is your bed a water bed?. Joists are supposed to be sized to handle a minimum of 60 to 80 pounds per square foot, which is actually a lot, since loads are distributed across the entire span. If you are seeing ridges, cracks, or movement under load, you have a problem. I have seen joists wain, crack or even fracture at a fault in the wood grain. If this situation has gotten worse, or happened suddenly, I would seek a pro to take a look. Don't want to scare you, but this is not normal and warrants further investigation. This is not a job for an amateur.
I guess I'm curious why you wouldn't simplify the layout like this:
Yellow = deck joists
Green = support beams
Your decking would run diagonally over the joists. If you use 2x boards for decking, that should be fine if the joists are 16" on center. If you want to use 5/4 decking, you should probably put the joists 12" on center so that the diagonal run is closer to 16".
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Best Answer
Typically, there is a beam put under the joists, then the post are put under each end of the beam. This detail is better suited for longer beams, covering more joists. Somebody has found new and unusual ways do do something there. I can see the logic of what they were trying to do, but makes for a lot of guessing still.
The problem really happened when the insulated pipe was drilled through the bottom edge of the joists.