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StructuralEng
StructuralEng, Consultant
Category: Structural Engineering
Satisfied Customers: 7185
Experience:  Structural Engineer
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Does anyone have flitch beam design experience?

Customer Question

Does anyone have flitch beam design experience?
Submitted: 1 year ago.
Category: Structural Engineering
Expert:  StructuralEng replied 1 year ago.
Hello
Expert:  StructuralEng replied 1 year ago.
I have plenty of flitch plate beam experience.
Customer: replied 1 year ago.
I am working on a kitchen remodel project. I am removing a first floor load bearing wall with a span of 15'6". The second floor floor joists are 9.25" dimensional lumber. I am looking to insert a new beam to carry the 2nd floor loads. The new beam will have the existing floor joists hung from either side with joist hangers. Both ends of the beam will bear on a steel beam in the basement level below. Local recommendations have been for a W-8X18 and or a multi-ply LVL (3-5 Ply depending on who I talk to). Three ply seems light and 5 ply seems like overkill.
Expert:  StructuralEng replied 1 year ago.
I will check this as soon as I get home
Expert:  StructuralEng replied 1 year ago.
Do you want a flitch plate beam sized for this?
Will it also support an attic or just the second floor?
What is the joist length on each of the beam?
Customer: replied 1 year ago.
Verify if a 3 ply LVL will work and if not then design a flitch plate beam. The roof is a trussed roof so the majority of the roof load is on the exterior walls and there is no attic space. The second floor is bedroom space. There is a bathroom but it is not above this section. Joist spans: the house is approximately 36' wide, the house is constructed with two load bearing beams/walls down the center with spans of 15' from exterior north wall to beam ... 6' from beam to beam .... and 15' from beam to exterior south wall. I will be removing a 15'6" section of wall directly over the northern beam. The new columns/point loads supporting the beam will bear on steel beams in the basement.
Expert:  StructuralEng replied 1 year ago.
You can use a 4 ply LVL 11 7/8 deep.
Expert:  StructuralEng replied 1 year ago.
4 ply 11 1/4" deep. Typo on the 7/8
Customer: replied 1 year ago.
The 11 1/4" LVL's are too deep. The homeowner wants a flush ceiling. The existing floor joists are 9 1/4" so the height of the beam can't exceed that of the floor joists.
Customer: replied 1 year ago.
You never responded to my last message that the 11/1/4 LVL's wouldn't work so I worked with another engineer for a solution.
Expert:  StructuralEng replied 1 year ago.

I apologize for the delay. I didn't receive a notice that you had responded.

Expert:  StructuralEng replied 1 year ago.

You can use a double 1 3/4" x 9 1/4" LVL with a 3/8" x 9 1/4" steel plate

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