Forums >> Revit Structure >> Technical Support >> Roof slope not showing up correct

sblake

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Joined: Tue, Jan 24, 2012
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I have put in many roof slopes using the floor tool and for some reason, this one is not working. It's a simple roof slope that is 1/4"/12".

I have all my roof joists in at the same slope. I have checked this using the "Spot slope" annotation and both the roof and the joists say 1/4"/12". However, after when you zoom in where the roof deck meets the joist, it aligns correctly on one end, but the other end it is off by 11/64". I have tried every way I know to put in the roof slope, but it's off by just a tad.

I have attached a screen shot below

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WWHub

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Joined: Tue, May 16, 2006
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What is your rounding on your spot slope units?  If you have it set to project units, then what is your project units?

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sblake

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Joined: Tue, Jan 24, 2012
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I have made sure the units of everything match. I set them at the most precise it will go...

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RevitMaestro

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Joined: Wed, Feb 28, 2007
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I messed around with this for a bit.  See attached screen shot showing the plan and section (the one with the plan with column lines 1 and 2).  I have the same result.  The reason is that when you change the slope of a beam using "start and end offset", the length of the beam changes.  There is nothing you can do about the length changing when you are modifying a beam in a plane that is not perpendicular to view.  And the slope tool will not pick up this minute of a slope change and will probably still display 1/4" / 12".

However, I have previously done this sort of thing on another project where I create the floor/roof, then go into a section of the floor/roof and create a reference plane at the underside of the roof or floor.  Call it "top of steel - 1" or "top of steel - 2" for each sloped section, or something to distinguish the separate reference planes.  When you create the beams, set the work plane to the respective reference plane for that slopes section, and your top of beams will fall exactly on that work plane.  See attached screen shot with the column lines 3 and 4 whowing the top of beam, bottom of floor, and highlighted reference plane.

Let me know if this works out for you.

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