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Stair stringer support

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Frankfort, Indiana
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[#1] Posted: 05/12/2011 - 6:05:17 PM
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The attached photos are from a 2 year old student housing complex I inspected yesterday. I believe the bearing points for the stair stringers are not adequate; however, I can not find any hard documentation to back that up. The smaller beam at the landing was added during construction and would probably be ok; if they had not attached it through the siding. However, the top bearing point just plain looks to small.

All in all it looks like the stair opening was to large and they made the stringers one step to short. However, all 32 stair sets in the complex are this way. And for what it is worth they are built just as the plans indicate.

Any ideas on a code reference?


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Bryan
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Chicago, IL
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Stair stringer support
[#2] Posted: 05/12/2011 - 7:48:34 PM
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I'd be talking more about flashing @ the beam penetration, and steel reinforcement at all the bearing points (Simpson stuff).

Depending on how the rest of it looked, I might have more to say.

Kurt in Chicago

"If I smell it, it goes in the report".............Phillip Smith...2012


Frankfort, Indiana
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Stair stringer support
[#3] Posted: 05/12/2011 - 8:00:59 PM
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Thanks Kurt,

Flashing was present both above and below the ledger and beam. The ledgers were also bolted; with the bolts installed two per joist bay and staggered.

I guess what initially caught my eye is there is not any bolts or lag screws, let alone any other type of connector, connecting the top of the stair to the landing above; and I was not able to see any solid connection point at the bottom either.

The only reference I have been able to find is the stairs must be able to support 40 lbs psf of tread area or a 300 lb concentrated load acting over 4 sq inches --R301.5 table note c

Bryan
Scotts Vally, CA
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Stair stringer support
[#4] Posted: 05/12/2011 - 9:14:51 PM
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You shouldn't be in the residential code, for the structure you described you need to be in the regular building code.

I sure don't like the grain run out on the bottom tread cut.



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Peter A Taheny
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Gaston, Oregon
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Stair stringer support
[#5] Posted: 05/12/2011 - 11:09:16 PM
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What do you want to bet that the nails at that hanger are only driven into sheathing?
Jim Katen, Oregon
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Louisville, KY
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Stair stringer support
[#6] Posted: 05/13/2011 - 04:19:22 AM
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Quote: Originally posted by Jim Katen

What do you want to bet that the nails at that hanger are only driven into sheathing?


That was the first thought that came to my mind.

ABI Home Services
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Stair stringer support
[#7] Posted: 05/13/2011 - 04:52:33 AM
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There's lots of questions I have about this, but it's hard to tell from a couple pics.

Could be into sheathing, or not. Could be lots of things.

One thing it is, is inadequate.


Kurt in Chicago

"If I smell it, it goes in the report".............Phillip Smith...2012


Frankfort, Indiana
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Stair stringer support
[#8] Posted: 05/13/2011 - 05:56:41 AM
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Quote: Originally posted by Ben H

Quote: Originally posted by Jim Katen

What do you want to bet that the nails at that hanger are only driven into sheathing?


That was the first thought that came to my mind.


I agree it is highly probable that the secondary hanger is only installed into sheathing. It is in the rim / band joist area the best case is it is installed in an engineered rim joist.

Bryan
Frankfort, Indiana
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Stair stringer support
[#9] Posted: 05/13/2011 - 05:58:51 AM
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Quote: Originally posted by patt


You shouldn't be in the residential code, for the structure you described you need to be in the regular building code.

I sure don't like the grain run out on the bottom tread cut.



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Thanks Peter. You are correct I was looking in the wrong code section. This does help.

Bryan
   
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