Forums >> Revit Building >> Technical Support >> Building Stretch - Wall Hosted Components

JDAGEN

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Today our team was asked to stretch an elementary school plan 16" In Autocad this is a very easy change. Moving the building 16" in Revit produced several error messages(52 messages). The messages realted to many things including some wall hosted and some NON Wall hosted elements - and others. Typical classrooms contained groups for casework, furniture, and a toilet room core, etc. Some of the casework elements were wall hosted to walls outside their group. In the end we deleted all of the case work and furniture in a temporary file, and made the 16" move. The error messages went from 52 to 4. We then tried to paste in the casework and furniture from an old file into the stretched file, along with the hosted walls, and then move the pasted casework and furniture into place on the correct plan. Moving theese elements into place proved difficult because of the wall hosted elements, even with 'constrain'un-checked and 'disjoin' checked during the move commeand. Here are my questions:

1.) Obviously  Wall hosted elements need to begrouped with their host walls is this correct?

2.) Would I have had problems even if there were no wall hosted elements or if hosted elements were grouped with their host. From what I have read elsewhere stretching a building is a trickey endevor in Revi. Is this so? What is the best way to stetch an entire wing of a building?

3.) What is the are best practices for grouping elements in prepetative rooms? Our firm does large senior care apartment buildings and K-12. Could anyone point me to some good resources. I read elswhere about aterial from Zoog's blog, but I can't find the material.

4.) Finally what are the best practices for casework. Should everything be non-wall hosted. Wood Work Institutes wall cabinets are wall hosted everything else is non-wall hosted? Should case work even be modeled in 3d? Should it be a linked file?

Thank you in advance

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WWHub

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I don't like having to stretch buildings after they have been developed very far just because of the reasons you encountered.  Some items can only move in an x direction while others can only move in a y.  When you say disjoin... you loose all tags, flag notes, dimensions ..... not good.  But you still have to find solutions. 

I don't like groups that span across parallel walls so in my hotel rooms, I have two groups per room.  Groups do not have to have the host wall in order to work ... even in this situation. 

Before I do this to a project, I try to find the right "cut" point to do the move from .... sometimes it's easier to do the other 1/2...  I also identify constraining items that cause you to hit the disjoin button.  Sometimes, you may have to delete a few items but you can copy from an old model to your new after stretching.

Your casework host should not interfere with expanding your building.  Nothing has to be 3D .... unless you need it for interior renderings, but I like at least 2-1/2D families ... symbollic lines for elevations/plans/sections ... sometimes I still have the 3d element but only visible in 3d views.  We are using 3D sections along side of 2D a lot more....

Watch out for linked files for items that may be edited or documented in the main file.  The elements will schedule but you can't tag them or edit their location.  I like to link our site.  Helps to keep the file size down.

I only like to stretch a building from a plan view with a full depth where everything is in the view.

Hope these thoughts help.

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JDAGEN

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Thanks for the reply. I agree "I don't like having to stretch buildings after they have been developed very far" - but unfortunately this is a very common occurance on our projects - especially in the value engineering process. On this project we are actually still in schematics.  am trying to understand if this is a shortcoming in Revit or user erro, or how we need to adjust workflow. We all still think through a CAD grid and stretching a building seems like it should be easy.

- I understand what you are describing with grouping elements in a unit along parallel walls.

• Does this mean you actually have 4 groups scince you have 2 sets of parallel walls or is 2 'L''s sufficient
• What about units that have interior rooms that also have casework?
• In the end would making apartment or classroom units components work better? I understand they walls won't clean up with walls outside the component. With some good family creation you could minimize those and use the line tool where needed to clean up the rest.

-I have experiments briefly with a process similar to what you mention with 2d/3d components with plubing fixtures.

• When you do this with casework and symbolic lines are they parametric?
• Are the components you describe wall hosetd?
• Are these types of casework components available somewhere pay or free? 
• Do they reduce file size?

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JDAGEN

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 This may be a partially helful work-around. If the unit group consists of nested casework groups is saved out as a seperate file. You could delete all of the casework in the group of the master file, make the stretch then reload the group with the casework. The fact remains that error messages occur particularly for wall hosted groups on large building wide moves. And the question remains why? And why dooes it happen on large move but not when an individual wall along with its hosted element is window selected and moved?

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