Forums >> Revit Building >> Technical Support >> Roof Problems

DPArch

active

Joined: Thu, Apr 26, 2007
4 Posts
No Rating

I am trying to get a square cut rafter end on my roof.  I have created the roof, and try changing, under element properties, the rafter cut to two-cut square, I makemy fascia depth deep enough to get the square cut, but when I hit okay I get a series of errors, the first is "Can't keep wall and target joined"  this is no big deal, I have had this error A LOT and I just click unjoin elements and reattach the wall later.  It's the next error that I can't deal with.  It says "Can't make footprint roof" and my only option is to delete roof.  I have tried re building the roof, I have tried doing the roof in pieces and joining them, nothing changes that second error.  What's even more weird is that I have done this with other portions of the SAME MODEL and have not had any problems at all.

Any Ideas???? 

This user is offline

framerman

active

Joined: Tue, Jun 29, 2004
543 Posts

I would start trying to keep from attaching the roof to your walls. Make your footprint using lines instead of pick walls. I started this way and still use it and you can run into problems. I've heard some people say if they deleted something as trivial as a dimension that a window will disappear or a roof will delete.

If you use just lines and offset from the wall then you will probably not get these errors very much anymore.

I have found that on my larger designs that using the "pick walls" command for my roof by footprint can seriously drag my computer down. Obviously, there can be some downside that if you move walls, then you will have to readjust your roof. It's a two headed coin. 

This user is offline

View Website

Mr Spot

site moderator|||

Joined: Mon, Jan 12, 2004
2889 Posts

I've found if your roof is above a particular pitch the rafter end options don't work...  One option would be to create an opening perpendicular to the face so its cuts at right angles.

 Isolate the roof and send it to support but i'm pretty sure you'll find the above is an annoying bug.

-----------------------------------

Regards,

Chris.

Co-Founder | BIM Consultant | Software Designer  B. Arch)

Xrev Revit API Addins | Revit Rants

This user is offline

View Website

Dgodfrey

active

Joined: Mon, Jul 4, 2005
137 Posts

This user is offline

lorne17

active

Joined: Wed, Aug 29, 2007
417 Posts

-----------------------------------

AutoDesk Revit Certified Professional

Denver, CO

Revit Architecture

This user is offline

framerman

active

Joined: Tue, Jun 29, 2004
543 Posts

You shouldn't have to guess where the roof goes, you should know where the roof goes. I think maybe your inexperience on how things go together in the field may be hampering your efforts more than the understanding of how the roof command can be used and should be used.

You can use either way, there's no right or wrong method. Granted, for many instances, I prefer the pick walls command over lines. Once you start getting complicated roofs is where things get a little hard to keep up with all the changes. If you had the roof attached to the walls and you moved it slightly, it can really cause quite a bit of rework. Though the other side of the coin would mean that you wouldn't know of the errors you just created.

Cutting a section view and readjusting your roof this way is not time consuming by any means. You just have to have the knowledge of roofs to know what to do with them. 

This user is offline

View Website

lorne17

active

Joined: Wed, Aug 29, 2007
417 Posts

You misunderstood my question, it has nothing to do with my experience.  When drawing a roof with lines, Revit by default puts the lowest part of the roof drawn at whatever level you drew it on.  So I have my T.O.P. 1 level set at 10'-1 1/8"  and I draw my roof footprint with lines (not pick walls) and it places my roof in the wrong location.  If it's rafter construction, I want a bird's cut in my roof.   So I am just saying the pick walls command is easier because by default it knows, the roof is being built off that wall at that plate height.  Which is the correct way.  It just seems to be a little tedious to have to cut a section and drop my roof each time I create it. 

I should have typed a different work when I said 'guess', I know where my plate height is and yes, I can move my roof to sit at that plate height accurately.  Just seems to me that it is more work than using the pick walls command.  Revit just seems to have more errors when using the pick walls method. 

I was merely trying to get an opinion as to which method in Revit is best.  Thanks for your suggestion. 

-----------------------------------

AutoDesk Revit Certified Professional

Denver, CO

Revit Architecture

This user is offline

Roof problems!

5

Roof design problems

12

More roof Problems!

2

Serious problems with roof

14

Irregular residential roof

12