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I have a second story unfinished room. The floor is OSB on…

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I have a second...

I have a second story unfinished room. The floor is OSB on 2x8 oc 24”. The room is approx 12x18’. The kitchen ceiling is below. I understand I need to b careful with weight as it is not engineered as a living space.To get in the room u step down about 9”. My question is this: could I create a new floor above the existing deck by hanging joists on the huge Girders that the existing floor is tied to? There is enough room to hang New joists above the existing floor without touching the deck.

Tutor's Assistant: OK. Is there anything else important you think the Structural Engineer should know?

I guess I am asking if I can have ceiling and floor independent of each other tied to the same girders?

Submitted: 8 months ago.Category: Structural Engineering
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11/21/2017
Structural Engineer: StructuralEng, Consultant replied 8 months ago
StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7,716
Experience: Structural Engineer
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Hello
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Structural Engineer: StructuralEng, Consultant replied 8 months ago
I can help
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Customer reply replied 8 months ago
I would like to hang 2x8 OC 16" above the existing deck if possible.
Customer reply replied 8 months ago
cover it with two layers of 3/4" OSB for sound control. The walls are on the girders and will not be placing weight on the new floor.
Customer reply replied 8 months ago
The girders are 18" microlam on all four sides of the room
Customer reply replied 8 months ago
I got an email saying you had responded. But, I don't see the answer.
Customer reply replied 8 months ago
Am I looking in the right place for your answer?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

I apologize for the technical difficulty. I posted some questions yesterday, but I see they're not here.

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

Are the joists spanning the 12' or 18' direction?

How big are the huge girders you're talking about?

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

18" deep, but how wide?

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Customer reply replied 8 months ago
Spanning 12’ direction.At least 2” wide. I’ll have to check to b sure.On one side there are three microlam girders side by side. The other wall is same type girder but also an exterior wall.
Customer reply replied 8 months ago
The actual span is 11’10”
Structural Engineer: StructuralEng, Consultant replied 8 months ago

If that's the case, then I would just sister the existing 2x8 with new 2x8 and not change what is loaded

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Customer reply replied 8 months ago
Will it handle another floor installed above the existing?
Customer reply replied 8 months ago
One other question. Does doubling the joist allow increased dead load?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Doubling the joists will double the capacity. It doesn't double the dead load, it only doubles the self weight of the joists, which is negligible.

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Customer reply replied 8 months ago
Will the girders support the installation of the second floor as described?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

It's impossible to say with the information provided, which is why I say that changing the load path is not a prudent thing to do.

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Structural Engineer: StructuralEng, Consultant replied 8 months ago

We can go through the exercise of figuring it out, but I would need much more information and I would need to submit a premium service offer for that.

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Customer reply replied 8 months ago
Are the weight of the joists included in the dead load?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Yes, but they make up only 1 psf of the 15 psf dead load.

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Customer reply replied 8 months ago
How much is that?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

I just stated that the joists make up about 1 psf of the 15 psf dead load

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Customer reply replied 8 months ago
No. How much is the premium service?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Got you. I can't discuss the cost in the chat, but I can submit the offer for you to consider.

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Customer reply replied 8 months ago
Ok
Structural Engineer: StructuralEng, Consultant replied 8 months ago

I will submit the offer for you now

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Customer reply replied 8 months ago
If new joists and OSB is installs above the existing, what is the risk?
Structural Engineer: StructuralEng, Consultant replied 8 months ago

Going over the existing and supporting it differently.

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