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Valley Beam Reactions

Valley Beam Reactions

(OP)
I have a structural valley beam coming in at 45 degrees (horizontal projection down) which is bearing on a corner wall at one end and a ridge board/beam on the other. Of course on the other side of the beam is the other valley beam which is the same configuration.

My expertise is roof trusses not rafter framing and I'm trying to wrap my head around conventional framing.

I'm trying to sort out the bearing of the valley beam on that beam/board. I believe that that valley causes a vertical reaction on the ridge beam/board, but someone else is telling me that the valley beams because they come in to the same point from opposite sides act like the peak of a set of rafters tying into a ridge board. I just don't think it is the same. I believe that the valleys cause a vertical reaction at the wall and on that ridge. But the other individual is saying the vertical reactions are all going to the wall cause the valleys oppose each other (at 45 degrees).

So, is there a vertical reaction on that ridge beam/board or does it all go to the wall?

RE: Valley Beam Reactions

Yes, there is a vertical reaction. Conventional construction would require that the valley beam be supported at the ridge / valley intersection. We always calc valley beams as if they are structural beams. The conventional framing portion of the code treats them somewhere between a structural beam and a ridge board. The analagy of a ridgeboard makes more sense to me for a hip as you have folded plate action. A valley to me should always be designed as a spanning beam.
 

RE: Valley Beam Reactions

With that said, if you can find a good way to tell the bottom of the valley together to form a tension tie I don't think anything is wrong with that. But it would be an engineered design which would need to be properly analyzed and designed.

RE: Valley Beam Reactions

(OP)
Thank you so much for your help, I really appreciate it.
I hate these old conventionally framed homes. I had someone recently tell me that sometimes it's now worth it to try and renovate them structurally, but just tear down and start from scratch.

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