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Old 12-27-2011, 10:54 PM   #16
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You have 20' joist bearing on a center wall = 10' of joist load X 13' of span x 70# of snow load plus 20# of deal load with a flat roof. 2 x 12's are not enough...... as Daniel said- they are many variables here. Just 90# x 10' x 13' is 11,700# possible load, how much does your car weigh? Hire an Engineer to meet local Code (and transfer liability from you), get a permit for the paper trail required by you H.O. insurance in case of future claims and selling $$$$.

Here is an idea of the loads 70# snow:

About the 17th chart---- so you can’t remove the wall without a replacement header:

Then you have your beam sizes---- 4-2x12’s only span 10’11”—need a paralam, glulam, or LVL or two….;



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Old 12-27-2011, 11:25 PM   #17
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I believe all of this is sort of moot because I think in NYC you need a permit to make these sort of changes to a load bearing wall and they won't give you one until they see stamped drawings from a licensed structural engineer.

I've already given you bad advice earlier, as revealed by those with more expertise who have posted afterwards. And they in turn don't have all the facts either. Hire a structural engineer. You can still potentially do the project yourself if you have the requisite skills...just follow their specifications for materials, construction, and temporary support.
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Old 12-28-2011, 02:30 AM   #18
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If your flat roof is supposed to support a load of 90 p.s.f. (70 p.s.f. of snow load plus 20 p.s.f. of dead load), your 2x8 joists at 24" O.C. barely meet the standards, regardless of what beam or wall is supporting them at mid-span. A structural engineer, in order to accept responsability for the design, might have you redo the whole roof, or add more beams across the house.

Look at it this way: Are pocket doors instead of regular doors worth all that trouble? (I hate pocket doors.)


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