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StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6640
Experience:  Structural Engineer
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Design a basement girder

Customer Question

Design a basement girder
Submitted: 4 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 4 months ago.
Expert:  StructuralEng replied 4 months ago.
Is it supporting one floor or two? What about an attic?
What is the joist length on each side?
Will it support any ceramic tile?
Customer: replied 4 months ago.
I have an existing basement girder (3) 2x8s down the middle holding up a 1 ½ story home. There are 4” dia steel posts 7’ apart. We want to add a modular second floor and attic. There are bearing walls directly above the girder. We do not want to change the size of the girder. We are thinking to make it a flitch beam by adding steel plates to both sides of the (3) 2x8s but we don’t know how thick the steel needs to be ¼”, 3/8” or ½”. The floor span is 12’. The total live load is 90 PLF and the dead load is 40 PLF.There is another basement girder that has the same loading but the floor span is 6’ and the posts are 8’ apart.Can you tell be what thickness stell and bolt size I need for these 2 beams?
Customer: replied 4 months ago.
It supports 2 floors and an attic. The length of the floor joists are 12 ft on both sides for one beam and 12 ft on only one side for the other beam. There is ceramic tile in 2 small bathrooms.

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