I-Joist Rafter Connection

[XR250]

Well, y'all know by now, I don't like i-joists. Here is reason #21.
I looked at flush, sloped hangers (LSSR2.1Z) and they are like $20 a piece.
How do y'all handle this situation?
Honestly, money is not an issue on this job, but it is just against my principals for someone to spend $20 on a hanger.
Might be the best way to go though.
The i-joist is 2" wide for reference and the demand is 400lb assuming 16" O.C.
I can get 2x12's to work but the Arch wants the extra depth for insulation and they are about 23 ft. long.

 

[phamENG]

It's either $20/hanger, or that much and more on a specialized insulation scheme that would fit in a 2x12 and meet the expectations/project requirements.

 

[GaStruct]

There are few sloped hangers. Are those the cheapest?

Only other option I see is to convince them to drop the ridge and trim it out pretty.

 

[XR250]

It was the only hanger i found. I think they would rather spend money on the hangers and keep things flush.

 

[TRAK.Structural]

Could you do a top mount hanger, and add some kind of beveled wood plate to the bottom of the rafter to get flat bearing? I've never seen a top mount hanger that also has sloped bearing.

 

[XR250]

Could you do a top mount hanger, and add some kind of beveled wood plate to the bottom of the rafter to get flat bearing? I've never seen a top mount hanger that also has sloped bearing.

I haven't seen one either. Not sure I trust a beveled plate. Has anyone tried that in this situation?
Also, a top hanger does not allow the bottom flange of the I-beam to be braced unless the rafters are installed tight to it which they will not be.

 

[jhnblgr]

could you make the beam deeper and use the flange with a beveled board for a seat instead and blocking for keeping it from rotating

 

[Harbringer80]

Why 16"oc for roof framing? Reducing the number of rafters will save more money than worrying about the cost of hangers. Increase your spacing, up your IJ series or even increase framing depth. The arch may appreciate more depth for insulation/venting anyway.

 

[XR250]

Why 16"oc for roof framing? Reducing the number of rafters will save more money than worrying about the cost of hangers. Increase your spacing, up your IJ series or even increase framing depth. The arch may appreciate more depth for insulation/venting anyway.

I'm going with 19.2" O.C. as the arch does not want 24"
14" is the max they want also.
Thanks for the thoughts

 

[JRR66]

If using a top flange hanger, I believe the BA Beam Hangers can be slopped but I think they would have to be ordered with the required slope. Which probably wouldn't be a much more cost-effective option.

 

[XR250]

If using a top flange hanger, I believe the BA Beam Hangers can be slopped but I think they would have to be ordered with the required slope. Which probably wouldn't be a much more cost-effective option.

I looked at those as well but as soon as I saw "special order" I knew someone was getting bent over

 

[Eng16080]

The i-joist is 2" wide for reference and the demand is 400lb assuming 16" O.C.

Seems low for a 23 ft span.

Anyway, I don't have a better alternative to your detail. You're gonna spend like 10 hangers worth of time just thinking about an alternative. Plus, it's relatively simple to construct this.

 

[XR250]

Seems low for a 23 ft span.

Anyway, I don't have a better alternative to your detail. You're gonna spend like 10 hangers worth of time just thinking about an alternative. Plus, it's relatively simple to construct this.

It is a 20 ft. span. 30 psf x 20 ft./2 x 1.33 ft = 400lbs

I agree with your sentiment.

 

[jerseyshore]

You're gonna spend like 10 hangers worth of time just thinking about an alternative.

Appreciate this. I'm going to refer to all fees in units of hangers from now on. I won't work for less than 11 hangers per hour.

 

[Eng16080]

It is a 20 ft. span. 30 psf x 20 ft./2 x 1.33 ft = 400lbs

Ok, that's fair. I forget everyone isn't dealing with high snow loads.

 

[ANE91]

I find it funny that certain jurisdictions require 30psf Lr instead of the 20 in ASCE 7. Guess they’re tired of roofers pallet-stacking shingles and collapsing roofs. Got nothin’ to add; sorry.