I have just been trying to create a simple box gutter that obeys everything revit by creating it as a gutter profile and then assigning it along a model line, that has been drawn at a slope because I wanted to at least include that much modelling when it comes to the section across the roof. BUT no, you can't sweep a gutter along anything other than level. I came across this thread, and this is a good workaround, not for my case but a good one anyway for normal eaves gutters.
Can anybody give me any reason at all why revit gutter profiles cannot travel down any slope? IMO this sort of restriction is what can make this program ever so slightly annoying. :banghead:
In my case I have created a profile under plumbing and swept it along the model line, at least it lives in a correct area, but I do get frustrated at the above problem when it comes to simple eaves gutters.

biff

Create "inplace sweep" pick roof lines as path. I used my fascia-gutter profile, or draw your own. I only use "pitch" not slope arrow but shouldn't be the problem though.

Not sure why the crash occurred, but I would agree with Mark - Fascia with gutter is the way I would try in the first instance. Attached is the family I typically use.

can't you just use "create" and make a sweep

Yes similar to the image above, but the entire edge of the roof is angled to the fall direction (see image)
roof fall.jpg

The reason I ask about whether this workflow is OK, is because playing around with reloading a new profile family as a fascia and assigning to a Fascia I crashed my session of Revit

If you mean you want the gutter to "fall" along with the fascia, sketch "as a fascia profile"the gutter profile in with the fascia profile all in one. Even works on curved extruded roofs