2nd floor joist load question

[wayne]

New home construction. Ceiling joist are 16' 2x6 on 16" centers. It's too late in the construction to change the joist size, but if the joist were doubled, would it be strong enough to support a room above?

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[Buccaneer]

What is the horizontal span of the joists?
https://www.thespruce.com/floor-joist-spans-1821626

 

[wayne]

What is the horizontal span of the joists?
https://www.thespruce.com/floor-joist-spans-1821626

16 feet

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[harley 2008]

Just go in and nail 2x8 beside your 2x6, I wouldn't double it with 2x6, It will pass codes then.

 

[wayne]

Update: ceiling joists are 2x8 not 2x6.


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[wayne]

Just go in and nail 2x8 beside your 2x6, I wouldn't double it with 2x6, It will pass codes then.

When you said 2x8 it rattled my brain. They are 2x8. Not 2x6.

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[Crazyeye]

I would think adding an additional 2x8 in between would accommodate most rooms. I have seen 2x 8 on 12” centers used. Yours would be 8” centers. Would also help to block or cross brace in between.


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[Crazyeye]

Forgot to add that i would still get an engineer to sign off on it though. That is the only way to be sure and protected.


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[Polar Kraft]

Alot of codes dept will require a engineer letter on something like that. The addition of a second floor can sometimes be restricted by the size of the footing. If the footing is minimum width/thickness for a single story a second floor would not be permissible by code unless the footing can carry the load. If you need an engineer PM me. I work for a engineer that does that sort of thing everyday

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[Polar Kraft]

Also that LVL may not take the load. I'd definitely get an engineer.

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[rhinoblake]

It all hinges on the LVL size and calculations to support a floor load. That same LVL will also bear the ceiling Joists, well techNicaly it bears 1/2 of each load. I will send you my number. I don’t mind to help anyway I can.

 

[wayne]

It's actually 2 LVL beams

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[rhinoblake]

Sorry. I didn’t put LVL(s). Plys depends on your width of stud obviously

 

[rhinoblake]

Just saw your pic. Your roof is supported on those LVLs, I see now you won’t have a ceiling load. The live and dead loads are increased with a floor load instead of the ceiling load the beams were intended for. Hard to slap another one in there now, but if you want the square footage better late than never.