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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 6690
Experience:  Structural Engineer
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Another question on this. If I'm removing a wall and

Customer Question

Another question on this. If I'm removing a wall and supporting it with a W8X18 beam and each end of the beam will be supported by a 6X6 douglas fir no. 2 what sort of support should by under the 6X6 posts? The posts are on the main floor and I have a basement. Can I simply set them on top of the plywood used on the main floor?
Submitted: 3 months ago.
Category: Structural Engineering
Expert:  StructuralEng replied 3 months ago.
Hello
Expert:  StructuralEng replied 3 months ago.
I can help
Customer: replied 3 months ago.
ok
Expert:  StructuralEng replied 3 months ago.
The posts need to be directly over a beam with a post directly under it with a footing under the post in the basement
Customer: replied 3 months ago.
ok hang on a minute please.
Customer: replied 3 months ago.
any other options here? I can't get a beam directly underneath the 6X6 posts due to the floor joist underneath the plywood. In this house it would be post, plywood, joist and then open air basement.
Expert:  StructuralEng replied 3 months ago.
You'll have to double up the joists locally with a post directly below
Customer: replied 3 months ago.
ok so in layman's terms. 2 joists side by side with a post underneath them?
Expert:  StructuralEng replied 3 months ago.
But the post must be directly under the post above
Expert:  StructuralEng replied 3 months ago.
that post needs a footing
Customer: replied 3 months ago.
here's one thing about this that I don't understand. The wall that I'm taking out, which appears to support the room above it, was resting on 2X4s that sit on top of plywood which rests on joists. That wall was not directly above a beam. It was offset by nearly 2 feet from the beam.
Customer: replied 3 months ago.
How was it capable of holding up the floor above it when it wasn't over a beam?
Expert:  StructuralEng replied 3 months ago.
Each joist supported a smal amount of load. Now you're concentrating it in just two points
Customer: replied 3 months ago.
the footing is absolutely required?
Customer: replied 3 months ago.
I have AC ducting directly under the joists where the 6X6 posts would be above.
Expert:  StructuralEng replied 3 months ago.
You can try supporting it on the basement slab, but without knowing anything about the slab (thickness, concrete strength, reinforcing) you risk cracking the slab and settlement of the post
Expert:  StructuralEng replied 3 months ago.
Then you will need to reinforce the joist enough to span over the duct and provide a post on each side of the duct under the joist in question
Customer: replied 3 months ago.
hang on please
Customer: replied 3 months ago.
If the 6x6 post rests directly above the AC ducting below I don't have a means to get support directly under the beam. That said, can the 6X6 sit directly on plywood with 2 joists underneath it? And then use your suggestion of supporting the joists on both sides of the duct? On one side of the duct is the beam that runs the entire length of the house in the basement.
Expert:  StructuralEng replied 3 months ago.
How wide is the duct?
Customer: replied 3 months ago.
16-18 inches or so.
Expert:  StructuralEng replied 3 months ago.
what size are the joists?
Customer: replied 3 months ago.
joists in basement are 2X10 and there are 2 joists side by side right underneath where the posts will be.
Expert:  StructuralEng replied 3 months ago.
For 2x10, I would triple it between the beam and the new post. It's controlled by shear
Customer: replied 3 months ago.
ok thanks for your help.
Expert:  StructuralEng replied 3 months ago.
No problem. I'm happy to help. Good luck with your project

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