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2

Usually the HVAC subs knock them out and leave them out, but if you place something like a 1X4 or heavier between the 2 joists at the bottom, it would stabilize the movement of joist deflection. Make sure it is a tight fit.


3

You need to box off that floor joist. You can remove an section of the joist in the way. You then build a box connecting the ends of the cut off joist to adjacent joists with perpendicular ties of the same dimensions of lumber. 2X10's for example. These ties transfer the load to the adjacent joists and give you an opening for plumbing or duct work.


1

Not unless they are 2x12 floor joists and it goes exactly through the center. The maximum permissible boring in a floor joist is limited to 1/3 of the height of the joist (with a 2" minimum). See IBC 2308.8.2. Sistering the joists would not effect this restriction, as it is an issue of the structural integrity of the framing member - not an issue of the ...


4

As a home inspector, I can tell you that sheer existence of those damaged joists are going to be a RED FLAG at any time you decide to sell and move on. If they are badly burned, they are not structurally sound and should be removed. Install a few temp supports on ends of adjacent joists, then remove and replace them one or two at a time. Use proper joist ...


0

Fine if you leave them just consider covering burner or smoked wood with a kilz primer for no after smell or effects.



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