outriggers on joist roof
outriggers on joist roof
(OP)
Doing a school with steel joist roof and cmu bearing walls. The building has a 4 ft roof overhang all around. I'm using joist extensions on the side perpendicular to joists. My question is on the sides parallel to joists. I've never used the loose outriggers from the joist mfg. cuz they say they aren't U.L. approved and I've always solved it some other way. This job has no simple solutions in that the spans are long and the allowable structure depth inside the eave/overhang is very limited, so the outriggers would be ideal.
2 questions:
Anybody used the outriggers and what was your experience? Is it still true that the outriggers are not U.L. approved?
tw
2 questions:
Anybody used the outriggers and what was your experience? Is it still true that the outriggers are not U.L. approved?
tw






RE: outriggers on joist roof
RE: outriggers on joist roof
RE: outriggers on joist roof
RE: outriggers on joist roof
tw
RE: outriggers on joist roof
RE: outriggers on joist roof
Your biggest problem with a 4 foot overhang will be uplift on the 1st interior member. You may need a moment connection there and extend back to the 2nd interior member to reduce uplift.
I hope the snow load is not too great! Don't forget about wind uplift on the overhang!
RE: outriggers on joist roof
The biggest issue we had was that the architect wanted to slope the roof (1/4" per foot) and they wanted the outriggers wanted to be level... can't have both.
So we had to make the structure level and use tapered insulation to get the roof slope.
RE: outriggers on joist roof
We have had the same request multiple times also. We have achieved this with varying steel heights to get the edge level but it is not an easy thing to accomplish.
RE: outriggers on joist roof
RE: outriggers on joist roof
RE: outriggers on joist roof