Beam system with trusses under a sloped roof

[atejeraLXRTJ]

Hello all,

I already create a beam system under a sloped roof (see attached jpg) but I am needing that the beam system attached the top of each individual framing element (trusses in this case) to the bottom of the roof.

Thanks a lot in advance!!!

[jbrazier]

Your trusses must be set to Bearing Chord - Bottom to maintain the bottom chords remain at the same elevation.  Select your trusses and select Attach Top/Bottom, check Top and then select your roof.  The bottom of truss should stay where it was but the top chord should extend up to the roof.  You may have to Remove the Beam System.

[atejeraLXRTJ]

Hello jbrazier,

I did it step by step but when I select the truss or trusses, I do not have the option of Attach Top/Bottom 😞

I don't know if the truss family has to do anything with that?

[jbrazier]

What truss type are you using? It has to be a "flat" truss not gabled, or tapered. The Howe Flat Truss works well, if you're using a custom truss family I'm not sure if it will work the same way.

[atejeraLXRTJ]

I am using a family from the Revit library: TJL Wood Open Web Joist... should I use other family instead?

[jbrazier · Accepted solution]

That's a joist family not a truss. Joist families have fixed depth and won't adjust.

[Studioearl]

I've been trying to get my truss to host (not attach/shape change) to the bottom of a roof (see pics)
In section, ideally, they'd be perpendicular to the slope, but I could tolerate them being vertical but all below the roof.

a separate question, my truss when placing them and picking plane (bottom of roof) seem to be attaching with the bottom cord on the top plane of the roof. is there a way to make the top of the top cord default to the bottom of the roof?