I would like to know what the maximum spam would be allowed on a 4 ply 2 x 10 basement beam support 2 floor above. I would like to be able to replace the current jack post as it will interfere with the basement layout. It currently sits at ~ 9 ft from the solid concrete wall, we would like to move it to ~ 12-13 ft to clear the room.
According to my span book the 9ft span is about max for the 4 ply 2x10 beam. You need 1 more measurement to calculate and that is your supported length. (2/3 of distance from wall to wall in direction of joists) Also you couldnt just move the column without cutting a 2'x2' hole in the slab and pouring a new footing.
Don't touch that post. Stress, load and sheer requirements are different now than when your house was built. If you remove the post, you will fail the City Building Department inspections. Without an Engineer's report and stamped drawings, you will be in a heap of trouble.
Before you do anything else, contact a Design Builder in your area to help you with your project.
Thanks for all the replies. I will need to consult an engineer to see what has to be done to allow the post to move.
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