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Old 10-14-2012, 06:13 PM   #1
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ledger board with joist hangars flaw


my contractor wants to nail a ledger board partway up 13' 2x6 studs and use joist hangars to create a 2nd story floor area. the span is 21'. Seems like the 2nd story should depend on more than nails to hold it up or maybe the joists should rest on top of the 1st story walls. Is this a bad design or acceptable building practice?
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Last edited by treedisaster; 10-14-2012 at 06:19 PM. Reason: add picture
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Old 10-14-2012, 06:33 PM   #2
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ledger board with joist hangars flaw


its called balloon framing it was the method used before the modern method known as western platform framing

its still used today for stair landings but thats pretty much it. .


get him to throw in some bolts to make the connection a little stronger

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Old 10-14-2012, 06:37 PM   #3
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ledger board with joist hangars flaw


What's this for, outside deck, a loft area?
Is there anything over the 2 X 6's? Drywall siding?
What's the area going to have to support?

Lag bolts would be used to attach the ledger to the studs not just nails.

Last edited by joecaption; 10-14-2012 at 07:01 PM.
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Old 10-14-2012, 06:55 PM   #4
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ledger board with joist hangars flaw


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Originally Posted by treedisaster
my contractor wants to nail a ledger board partway up 13' 2x6 studs and use joist hangars to create a 2nd story floor area. the span is 21'. Seems like the 2nd story should depend on more than nails to hold it up or maybe the joists should rest on top of the 1st story walls. Is this a bad design or acceptable building practice?
What's this for? Do you have plans drawn from an architect?
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Old 10-14-2012, 08:57 PM   #5
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ledger board with joist hangars flaw


the other question is what is he planning on using for joist material.. tji's? its the only thing that can span that long. you might be able to get ojt's that will span that but ive never worked with ojt's longer than 15 ft
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Old 10-14-2012, 09:12 PM   #6
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ledger board with joist hangars flaw


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the other question is what is he planning on using for joist material.. tji's? its the only thing that can span that long. you might be able to get ojt's that will span that but ive never worked with ojt's longer than 15 ft
FYI, light gauge steel can span that distance.
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Old 10-14-2012, 09:22 PM   #7
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I remember another similar post about 3 years ago, can't find it now... The studs/ledger would require engineering as said, because of the fasteners weakening them there. The bearing roof loads above figure in to the calculations as does the house location; high wind, seismic, etc.; the foundation may need to be re-enforced due to added loads, etc., check with your local AHJ. A permit means "safe" minimum structural standards, and will help with your H.O. Insurance carrier if ever a claim and when you sell the house.

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Old 10-14-2012, 09:22 PM   #8
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The proper procedure was to cut the ledger (1-1/2") into the studs, and block between studs (2x6 ripped to 4" in your case) behind, or 2x6 above or below for firestop. It is illegal now in most of New England, maybe most other places, because of the fire hazard. You would have to check Life Safety Code in addition to building codes.
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Old 10-15-2012, 01:16 AM   #9
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ledger board with joist hangars flaw


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Originally Posted by joecaption View Post
What's this for, outside deck, a loft area?
Is there anything over the 2 X 6's? Drywall siding?
What's the area going to have to support?

Lag bolts would be used to attach the ledger to the studs not just nails.
Here is the big picture
except 2nd story wall now 6' instead of 4'
joist material is manufactured, described as many 2x4 glued/fastened together, 12"
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ledger board with joist hangars flaw-bigpic.jpg  

Last edited by treedisaster; 10-15-2012 at 01:18 AM. Reason: add joist material
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Old 10-15-2012, 10:19 AM   #10
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ledger board with joist hangars flaw


So the structure is already built? Is it a structural ridge beam not requiring joists to hold the rafters together and that is why you are contemplating adding joists after the fact? If that is the case cut in the ledger to the 2x6 wall and use joist hangers for the joists. lag bolts might even be ok for the ledger but the ledger cut into the wall is best.

Last edited by hand drive; 10-15-2012 at 10:21 AM.
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Old 10-15-2012, 04:12 PM   #11
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ledger board with joist hangars flaw


Duck hit it, don't forget your fire blocking or your stud bays will act as a chimney
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Old 10-15-2012, 04:40 PM   #12
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Old 10-16-2012, 09:59 PM   #13
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ledger board with joist hangars flaw


Quote:
Originally Posted by treedisaster View Post
Here is the big picture
except 2nd story wall now 6' instead of 4'
joist material is manufactured, described as many 2x4 glued/fastened together, 12"
Who's designing this? Do you have plans and permits?
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Old 10-17-2012, 04:35 AM   #14
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ledger board with joist hangars flaw


Contractor disigned it, his primary business appears to be excavating. Permits are not required in this county and I have not seen plans yet, just descriptions. Once I have plans, I have no idea where to find someone to check them over, thus here I am.

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