I Joist Rafters over Ridge Bm

[bigmig]

I'm wondering if anyone has some recommendations on this age old issue that I keep bumping into...

The I joist rafter bearing over a wood ridge beam. Simpson makes a VPA clip, which seems fine, but I recently found out that the clip is too wide for any ridge beam less than 6 inches in width...
the brackets collide (see image). The contractor had to offset the rafters (of which he was not happy with doing I guess).

A dual slopingin (beveled) wood plate running continuously along the ridge beam seems hard to cut because it is a against the grain beveled cut.....seems like it would just burn your saw up.
Individual wedges of wood seem too small.

What options do others use for this seemingly simple, yet perplexing connection?
The issue is that I'm trying to avoid a knife edge bearing condition of the I joist flange on the corner of the ridge beam.

Thank you.

 

[Aesur]

I typically specify a shim/beveled plate and use H clips for uplift and nails for in plane of I-joist loading (if needed). I haven't had a contractor complain about the shims yet, in fact Redbuilt recommends the beveled plate. See the roof details on page 14 of I-joist Guide.

 

[RontheRedneck]

A contractor can rip a beveled plate on a jobsite table saw. No big deal.

We don't sell many I-joists for use as rafters due to all the requirements for the connections.

 

[bigmig]

A sloping joist bearing seat is statically an issue regardless of the joist manufacturer giving it a thumbs up. The wall wants to move, or the joist wants to slide.
A quick freebody and you can see this. I know you can fasten it off so it doesn't slide, but the fundamental concept is this.....a sloping seat is a seat
to try and avoid. At least that is what I have been taught. That is why the VPA was a good option, until now (see conflict in image I attached).

@rontheredneck I guess I am picturing a slope across a 5. 1/2 inch 2x that goes from zero to 1. 1/2" thick for example. A table saw on a bevel angle doesn't protrude far enough
to do that, unless I"m missing something.

 

[phamENG]

a sloping seat is a seat to try and avoid

Sure, if you can, that's fine, but you're saying you can't. Nearly everything we design will have loading that is parallel to the bearing surface at some point during its service life. That's why we design connections. Now you have to be a little more thorough with this one - using a C_D of 0.9 with a dead only load combination might actually be important here.

A beveled plate is easy for a contractor to cut with a portable table saw. There will be two cuts, one from each side. They'll pass the plate through the saw with the narrow face on the table. Even a 10" can usually get a 3.5" cut depth. You'll lose a little of that in the angle, but you only need 2.75" for a 5.5" plate.

I don't do ridge beams below. Not entirely sure why, but I've never seen it done in my area. Everyone fastens the rafters to the side of the ridge beam as if it's a ridge board.

 

[RontheRedneck]

bigmig - You're correct that it would not be an easy cut. But it could be done.

The saw could be set 1" deep, and one pass made. Then another pass with the blade 2" deep. Then flip the board, readjust the fence, and start cutting from the other side.