Trouble with a Simple Roof

[orwake]

I am having a problem with a simple roof. It seems related to a wall issue
which is not at all evident to me. I imported the original building shape from walls in a project where this portion of a roof was giving me fits. . . it seems that the same problems have carried over, but when I draw the same walls in the attached file the roof will generate with no problem.
What is going on here?

[patricks]

dang that's crazy, I don't know why it's doing that. Can you blow away and recreate the walls?

[BillyGrey]

Looks like a bug to me.

[orwake]

I guess I can start over with these walls. . . really don't want to because they are aligned to 2 walls on other levels below, attached to floors etc. etc. I have encountered similar situations in the "distant" past and ended up doing just that. . . but. . .I would rather learn what I have done wrong, and then fix it, not just scrap previous work. I realize that there are true "bugs" out there, but in my experience, it is simply oversight or lack of knowledge on my part that usually gives me the most trouble.

Thanks for any other help that might be offered.

[orwake]

ok, this is really bugging me now. . .

I went back to my original project,deleted these walls, redrew the same outline using generic walls, and still cannot create the roof based on this footprint. ?

[eddy.lermytte]

I have reset the location line of offending wall's
Positioned the offending walls so Revit is able to create the roof.

[orwake]

Eddy,

Thanks for the response- - -

I see you made the roof work, but I don't see what you changed except the overall length of the building was shortened a few mm.
How do I see the "Offending Wall" and what was it's particular offense?

[eddy.lermytte]

Orwake
It's not the overall length I changed to made the roof work.
Pic A -> shows what makes Revit unable to create the roof.
Pic B -> result after deleting the "1077.6" long wall and mirroring the remaining opposite wall to set things right.
Hope this helps

[clog boy]

How did you become a genius?

[orwake]

Ok Eddy,

Thanks for the correction. . .
my Imperial units were set to 1/16" tolerance and didn't show the discrepancy when drawing the walls.

When I went in to adjust my original walls, I found some slight angle errors (.000000000001 off ) and then a few mm. here and there (as you pointed out), BUT....

Why would the measurements need to be "perfect" in this case to create this roof?
I have tried other roofs with "off" angles and measurementsn non parallel walls, etc. and the roof generation works fine. How can I tell what is "bugging" Revit in certain cases when there are no specific error messages or warnings (i.e. slight alignments inaccuracy, etc.)? You may be a genius in your own right, but did you detect this error in my drawing because your units were metric (mm) ? or were there other clues?