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Forums >> Revit Building >> Technical Support >> Does instance parameter considered in quantity calculation of walls?

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Wed, May 22, 2019 at 9:35:10 AM | Is instance parameter considered in quantity calculation of walls?

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Sherazyarchi


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Hi,

I have a wall type "CMU_200mm". Some of this wall are fire rated and some should have STC (sound transmission class) assign to it. The fire rating parameter is inside the wall type, so if a value given, it is applied to all walls. I am thinking of creating an instance shared parameter for fire rating to be able to give fire rating values to specific walls only. Is this technically correct in terms of quantity calculations? or I should create new wall type for each fire rating I have? i.e. CMU_200mm-1hr,   CMU_200mm-2hr,   CMU_200mm-3hr...etc.

If I have to create a separate type for each fire rating of the CMU_200mm wall, I will face a similar problem with the STC where some of 1hr fire rated walls for example should have a 45 STC, some others are 30 STC, and the rest has no STC value. In that case and under the same idea, should I create more wall types for the different sound transmission classes? i.e. CMU_200mm-1hr-45STC,   CMU_200mm-1hr-30STC,   CMU_200mm-2hr,   CMU_200mm-2hr-30STC...etc.

I thought that the best way is to move all these parameters out of wall type and keep them as instance parameters that are editable from the properties panel of every single wall of the same type. My worry is only the quantity calculations. Is Revit able to give quantities of the same wall type by instance parameters?

Thank you 

 



Edited on: Wed, May 22, 2019 at 5:17:50 AM

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Wed, May 22, 2019 at 1:33:43 PM | Does instance parameter considered in quantity calculation of walls?

#2

tim123


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Joined: Tue, Apr 12, 2005
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You can schedule the instance properties of walls, so there is no need to create new walls.  But surely any 200mm CMU wall has the same sound transmission and fire rating as any other.  If the wall is actually different (ie has some insulation layers or something) then I would rather create  a new wall type for this.


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Thu, May 23, 2019 at 7:04:24 AM | Does instance parameter considered in quantity calculation of walls?

#3

Sherazyarchi


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Thank you for your response. I will follow your advice and create new wall types.


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