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STRUCTURAL I BEAM SPANS

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DAVID PADILLA

12-16-2005 12:12:27




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I have a 2 story room addition the dimension is 22feet 10inches by 18'4.5inches, the length will be shared to the existing house but I am planning to place its oun footings for that side My question is what is the best way to have the bottom floor with no bearing walls in the middle of the room to support the upper floor, can I use a steel beam in the middle of the 23foot span18 feet longand use lvl or 2x10 at 18inch apart between outsidewallsand ibeam for the flooring, what sizes should I use for the i beam and these flooring studs. I was thinking a6"x18'ibeam and 2x8 or 2x10 can anybody help??

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Coke in MN

12-24-2005 09:17:30




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 Re: STRUCTURAL I BEAM SPANS in reply to DAVID PADILLA, 12-16-2005 12:12:27  
There is more to the equation than the size of beam. Will the upper floors be bearing on this beam also and how is the roof supported ? Are you using trusses and transfering load to outside walls. As it is 2 story , what calculation are you using for the floor load on each floor and how is this being supported. Is your first floor clear span or does it have bearing wall to carry second floor. A LBL may be better than a steel beam. Or the use of engineered truss in floors may do what is required to spread load to footings.

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TimBinWV

12-18-2005 05:25:52




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 Re: STRUCTURAL I BEAM SPANS in reply to DAVID PADILLA, 12-16-2005 12:12:27  
I'm no structural engineer,but I've been a carpenter for a while. If you use a 4x12 i-beam with at least a 3/8" thickness across the 18' span,and 2x12 along the 23'span,then you should be good to go. The real question at that point is what side your outside load-bearing walls are on,the short-side or the long?Are your trusses 24' or 18'? Are you planning any interior walls for the 2nd floor?



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Don BC

12-16-2005 22:38:01




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 Re: STRUCTURAL I BEAM SPANS in reply to DAVID PADILLA, 12-16-2005 12:12:27  
I am an engineer but not a structural engineer. I also recommend that you engage the services of a structural engineer if you are going to use a steel beam. You may find a beam that is strong enough for the load but it could have too much deflection(ie, the floor will bounce). Laminated wood beams can be stiffer and easier to work with and the beam supplier may have an engineer to size the beam for you and provide the necessary hangers or determine that wood trusses spanning the full width are less costly.

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J.C. IN AZ.

12-16-2005 21:36:05




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 Re: STRUCTURAL I BEAM SPANS in reply to DAVID PADILLA, 12-16-2005 12:12:27  
You need the advise of a Profesional Structural Engineer.I Beams have "Sag" also after a certain Spanning Width is exceeded.Depending on the weight to be suported,some Wood Floor Trusses if they will "fit',depending on Heighth, are some times better than a steel I Beam.



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