Need Roof, Have No Plans

[glenn kangiser]

The issue I see is not the beam but the idea that the beam is not supported at the ends to the ground through one path or another.

Only indirectly over studs through the top plate and I assume the other end is over open space of a room below can cause sagging of the wood, beam and spreading of the walls.

[SansPlans]

I think I'm confused a little, are you talking about spreading of the main walls of the house, or of the walls of the little top room?

[glenn kangiser]

The little top room.  

[SansPlans]

oh ok I think I see what you mean. I am going to put some posts under the triple rafters under the beam and put some studs right under the beam resting on the triple rafters going through the floor down to the bedrock, I just haven't figured out how to do it yet. I guess I can build up a post or something, nothing I have laying around is tall enough.

[glenn kangiser]

Any way to properly transfer the load should work.  Mostly just look at it thinking about where the weight from your snow load 20psf? -and floor loads and dead loads - weight of building materials etc.   would go if it actually got loaded that heavily.  Then decide how they will be supported to the ground.

[MountainDon]

Glenn makes some good points there.