Maximum span on 4 ply 2 x10 beam

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Posted by: from Qunite West , Ontario
5/4/2016 at 8:48:53 PM

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.


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Date/Time5/4/2016 at 10:15:58 PM

My suggestion would be to consult an engineer.

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Date/Time5/5/2016 at 7:09:15 AM

Consult a structural engineer. Worth the money. LVL (laminated beam) are commonly used to support long structural spans. An engineer would tell you how many you would need.

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Date/Time5/5/2016 at 8:44:35 AM

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.

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Date/Time5/6/2016 at 5:21:17 PM

Hi Randy,

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.


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Randy in Qunite West , Ontario
Date/Time5/7/2016 at 6:51:20 AM

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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Bill from Bills Carpentry in Moncton
Date/Time5/30/2016 at 5:16:19 PM

Best advice I can give and what I would do is contact your city inspectors. They will tell you what they would approve. Every city is different.

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