Requirements for ledger board attached to bookshelf framing

[tman7078]

I am building a mezzanine in my shop. The framing of the shop is 2x6 bookshelf framing that have doubled up 2x6 posts every 48”. I don’t want to build a second wall in the back to support the joists. I want to use ledger board with hangers. The joists are 16’ long 9 1/2” tall Ijoists. I believe code is the ledger board needs to be attached every 11” with screws.

Does anyone have a suggestion on how to attach the ledger board?

The mezzanine will be 36’ wide and 16’ deep. I plan on putting a heavy pool table in the mezzanine.

 

[matt_i]

A picture would help here.

I wouldn't count on the bookshelf girt as being anything structural unless you did something special to the ends where it attaches to the columns.

The ledger board could be supported by vertical 2x framing materials acting like mini columns, between the big building columns, and screwed flat to the horizontal girts.

From your I-joist sizing catalog its important to make sure you have proper bearing length on the joist ends.

I don't know how long the span is but armed with the heavy pool table info I wouldn't think that 1-1/2" is enough.

I would also consult the tables to go L/480 loading or even another step past that. No sense in getting a floor where you can feel the deflection thru your body as you walk around.

 

[firebirdparts]

The idea of a ledger board is that the ledge exists. Which you ain't got. So really, it's a beam design that you are looking for, or you can just use the board and support it from the floor at reasonable distances.

 

[bczygan]

Take the total load (Live plus dead)per square foot that your floor is designed for and multiply by half the joist span in lineal feet. Multiply that by the 4' span between double 2x6 columns. Then choose a ledger beam that will span 4' and support that total load with the deflection limit you want, say L/360. Make sure the fasteners into the columns are adequate, or as mentioned above, add a 2x to the face of each column for support.

Bill (Designer)

 

[larry_g]

In my build below you can see how I did it. Not saying its right or wrong, just what I did.

lg
no neat sig line

 

[tman7078]

Thanks for the input everyone. The 1st picture is how the building is being framed. The second picture is the wall partially framed that I want to put the ledger board on. It is a little unique as the floor below the mezzanine will be over a basement. The lot slopes down towards the back of the lot, so we did a poured wall foundation, we put in a basement to save on fill. Above the basement will be a office, bathroom, kitchen and staireps up to the mezzanine.

I don’t think I can change how the back wall is framed by the contractor but I could always add cripples to get the framing every 2’ on wall with ledger board.

Any additional thoughts?

 

[strutaeng]

I see your point about not wanting to add another load bearing wall.

You'd have to check the wall if it can handle the load. Looks like you have double 2x6s at 48" o.c., about 16' tall? That wall currently supports roof live load, dead load, snow load. And now you want to add more dead load and floor live load eccentrically. No telling what your mezzanine floor construction is or what your live load is...Storage? 125 psf?

Hire an engineer to tell you if what you want will work and he can give you a drawing on the connection, or an alternative framing. Or add a sistered stud next to the existing studs to support the mezzanine floor joists. That way you are not adding load to existing studs.