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Forums >> Revit Building >> Technical Support >> flat roof internal drain
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Joined: Wed, May 10, 2006
21 Posts
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i've figured out how to make a completely flat roof. i've figured our how to use the slope arrow to create the slope. the problem: we are sloping the roof away from the parapets to internal drains. i really just need two main slopes to a center valley and the rest will be done with crickets, but the slope arrows only let me put the tails on the edge of the roof... creating an opposite pitch of what we need...
thanks
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Joined: Wed, Mar 29, 2006
197 Posts
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Hey Colorado
Fort Collins here.
You can use the Defines Slope check box that appears in the options bar when sketching a roof. I just had a simular problem, where I had to use the rigde line to define the slope. I just used -1/4" and it sloped the roof down instead of up. So, in your case you may need to create half of the roof at a time. Then, define the slope with the valley line. Create the other half and define it's slope with using the same valley line. You could use the Slope Arrow the same, if you make it 2 sepperate roofs. Don't forget that when sketching the roof you can use the Line tool, and select the Arrow instead of the Pencil (in the Option Tool Bar) and select the valley line. This will help keep your roofs from overlapping or leaving a gap.
Are you going to be modeling roof drains or just using 2D lines. I'm looking for some 3D roof drains.
Let me know if this helps.
ArchWestCY
Go Broncos
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Joined: Wed, May 10, 2006
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thanks, i'll try that. i figured i'd have to make my roof in halves.
we'll prob'ly just do the roof drains in 2d, this is the first revit project in the office, so we're really focusing on the superstructure first...
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Joined: Mon, Mar 14, 2005
777 Posts
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like ArchWestCY says, you can use the define slope and give it a negative value, but remember that the bottom of your foor will slop as well...
if its a flat roof, you can use a floor and use voids to create your fall, that way the bottom will stay flat.
if you want to be real accurate with falls and where they start from and finish, you can use masses and dwg, (see tutorial for cmplex slabs) though it will take a little time first go 
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