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Forums >> Revit Building >> Technical Support >> flat roofs
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Joined: Thu, Aug 4, 2005
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hi,
apologies if this is an obvious question, but here goes:
i need to model a flat roof that has a slight pitch because of tapered insulation above the joists and sheathing. if i try to model this using roof by footprint, revit pitches the entire roof construction. i need the joists and sheathing to remain flat, so how do i tell revit that the pitch applies to the insulation only? should i be using roof by extrusion?
thanks.
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Joined: Thu, Apr 22, 2004
160 Posts
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You can make two separate roofs - one for your structure and a second for your insulation. You can join them together after you create them. A quick method would be to copy and paste to the same place then change the copy to your insulation and offset it above the structural.
Another method since you have a flat bottom and a pitched top is to make it all flat then cut the pitch into the insulation using a void.
Post edited on 2006-01-31 17:08:11
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i think the first method leaves me with the insulation pitched on both the bottom and top, and i need the bottom of the insulation to stay flat.
could you explain the void a bit further? i thought void forms were only for family objects, not roofs?
i'm relatively new to all this...
thanks
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Set up a reference plane in plan view - lets say across the center of the house perpendicular to the roof pitch, in the reference plane properties name the plane - "center". go to an elevation or section view perpendicular to your pitch then use the "Modeling - Create - Void - Extrusion" tool, select the "center" reference plane you created as your working plane, sketch in a wedge shape profile for the section you want cut out, once sketched go to the void properties and set the + and - distances you want to cut from the reference plane (this does not need to be precise - just so it goes beyond the roof edges, use the "cut geometry" tool to have the profile void cut the roof, make the cut before you exit the void family or you get an error that the family is not cutting anything.
Hope this helps - their's always the tutorials!!
Post edited on 2006-02-01 13:42:21
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thanks very much!
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