Tag Archives: Roofs

Align Eaves

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During a recent session of Revit Radio I was asked a few questions about roofs and their properties.  A post I did a while ago on Roof Overhang Values which covered one of the questions.  However it didn’t answer the question of why are the roof eaves not aligning? In the image below both sides of the roof have a 3′ (914mm) overhang with the same roof pitch on the entire roof.

Align Eve Plan

The reason this may happen is the fact that one of the sketch lines used the pick wall tool whilst the other was simply drawn as a line (or possibly the pick lines tool with an offset).

What the help file doesn’t explain is that when the pick walls tool is used along with defining that edge as a slope then the slope starts from an edge of the wall picked (the edge of the wall depends on if Extend into Core is used or the roof is set as a Truss or Rafter).  If a line is sketched then the slope will start from sketch line itself.  Using both of these tools will cause the issue as seen in the above image.  Revit however does have a simple tool to assist in adjusting the roof eaves if this situation does arrive.  The tool to accomplish this task is Align Eaves and can only be accessed while in sketch mode.

Align Eaves

If the eaves are aligned Revit will flag a warning of “All eaves are already aligned”, if the eaves do not align then Revit will display the elevation of the eaves relative to the closest level.  There are also two overlooked option on the contextual ribbon “Adjust Overhang” & “Adjust Height”.  Before attempting to adjust the eaves make sure to select the correct option, most of the time this will be Adjust Height, yet the default is Adjust Overhang.  Once the correction option is selected choose the value that is correct and select the sketch lines that need to adjust, similar to the align tool.

Continuous Overhanging Gable Roof

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A question came up in the Linkd In Group for Club Revit  about creating a single roof with a gable end that would basically go underneath itself to attach back to a wall.  I thought I would do a post to my simple response, so that I can get a bit more detailed in the explanation.

The first step is to create a roof by footprint, personally I would use the Pick Walls tool for this situation.  Uncheck the defines slope option to get the gable ends as needed.  Finish the roof when done

 

 

 

 

 

 

 

 

This doesn’t alone dosen’t get the small gable end roof to come back under itself to attach to the wall.  It also doesn’t automatically take the walls up to the roof.

 

 

 

 

 

 

 

 

 

 

 

 

I chose to model another wall above the other and make it the full length of the roof, and then attach that wall to the roof.  This way I have something to Join the roof to.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

The next step is to use the Roof Join/Unjoin command located on the Geometry panel of the Modify Tab on the ribbon.

 

 

 

 

Pick on the edge of the roof that needs to Join to the wall and then pick on the wall.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

This will be the completed result.  Now just go in and add all the detail like soffits, fascias and gutters.

 

Roof Overhang Values

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A question came up on Revit Radio yesterday that I thought would make a good post.  The question was about roof overhangs and how to control if the distance is measured from the face of the wall or the wall studs (wall core in the Revit world).  The first thing to clarify is that everything I am showing is ONLY true if you use the Pick Wall button instead of just drawing lines while inside of sketch mode.  I use pick walls because if the wall moves then the edge of the roof will move with it and maintain the overhang value.

So how does Revit determine where to set the overhang value if you use Pick Walls?  In the Options bar next to the overhang value there is a check box for “Extend to wall core”, when this is selected the overhange value is taken from the face of the core, if this remains unchecked then the overhang is determined from the finish face of the wall.Then the question came up what if I want it to have a birds mouth notch?  There is a setting for this too.  In the properties of the roof there is an option for Rafter or Truss, if the value is Truss (default option and shown above) then the roof starts on the exterior face, if the option is Rafter the roof is set to the inside face.

These explanations seemed to answer the question, let me know if it didn’t clarify things for you.